Lincoln Navigator: Exterior Lighting / Headlamps. Diagnosis and Testing

Lincoln Navigator 2018-2025 Workshop Manual / Lighting / Exterior Lighting / Headlamps. Diagnosis and Testing

Diagnostic Trouble Code (DTC) Chart

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices.
REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).

Module	DTC	Description	Action
BCM	B14E0:11	Exterior Lamps Power Supply 'C': Circuit Short To Ground	GO to Pinpoint Test A
BCM	B14E0:15	Exterior Lamps Power Supply 'C': Circuit Short To Battery Or Open	GO to Pinpoint Test A
BCM	B14E1:11	Exterior Lamps Power Supply 'D': Circuit Short To Ground	GO to Pinpoint Test A
BCM	B14E1:15	Exterior Lamps Power Supply 'D': Circuit Short To Battery Or Open	GO to Pinpoint Test A
BCM	B1533:02	Headlamp Switch Module: General Signal Failure	GO to Pinpoint Test A
BCM	B1533:08	Headlamp Switch Module: Bus Signal/Message Failures	GO to Pinpoint Test A
BCM	B1533:49	Headlamp Switch Module: Internal Electronic Failure	GO to Pinpoint Test A
BCM	B1533:56	Headlamp Switch Module: Invalid/Incompatible Configuration	GO to Pinpoint Test A
BCM	B1D00:11	Left Low Beam: Circuit Short To Ground	GO to Pinpoint Test A
BCM	B1D00:15	Left Low Beam: Circuit Short To Battery Or Open	GO to Pinpoint Test A
BCM	B1D01:11	Right Low Beam: Circuit Short To Ground	GO to Pinpoint Test A
BCM	B1D01:15	Right Low Beam: Circuit Short To Battery Or Open	GO to Pinpoint Test A
HCM	B1041:54	Levelling Control: Missing Calibration	GO to Pinpoint Test G
HCM	B1437:01	Left Levelling Actuator: General Electrical Failure	GO to Pinpoint Test F
HCM	B1437:87	Left Levelling Actuator: Missing Message	GO to Pinpoint Test F
HCM	B1437:87	Left Levelling Actuator: Missing Message	GO to Pinpoint Test M
HCM	B1439:01	Right Levelling Actuator: General Electrical Failure	GO to Pinpoint Test F
HCM	B1439:87	Right Levelling Actuator: Missing Message	GO to Pinpoint Test F
HCM	B1439:87	Right Levelling Actuator: Missing Message	GO to Pinpoint Test M
HCM	B14DB:01	Left Headlamp Driver Control System: General Electrical Failure	GO to Pinpoint Test H
HCM	B14DB:54	Left Headlamp Driver Control System: Missing Calibration	GO to Pinpoint Test H
HCM	B14DB:87	Left Headlamp Driver Control System: Missing Message	GO to Pinpoint Test M
HCM	B14DC:01	Right Headlamp Driver Control System: General Electrical Failure	GO to Pinpoint Test H
HCM	B14DC:54	Right Headlamp Driver Control System: Missing Calibration	GO to Pinpoint Test H
HCM	B14DC:87	Right Headlamp Driver Control System: Missing Message	GO to Pinpoint Test M
HCM	B1559:96	Left Headlamp: Component Internal Failure	GO to Pinpoint Test H
HCM	B155A:96	Right Headlamp: Component Internal Failure	GO to Pinpoint Test H
HCM	C1A03:29	Left Front Height Sensor: Signal Invalid	GO to Pinpoint Test G
HCM	C1A05:29	Left Rear Height Sensor: Signal Invalid	GO to Pinpoint Test G
HCM	U0100:87	Lost Communication With ECM/PCM 'A': Missing Message	GO to Pinpoint Test N
HCM	U0121:87	Lost Communication With Anti-Lock Brake System (ABS) Control Module 'A': Missing Message	GO to Pinpoint Test O
HCM	U0122:87	Lost Communication With Vehicle Dynamics Control Module: Missing Message	GO to Pinpoint Test P
HCM	U0131:87	Lost Communication With Power Steering Control Module 'A': Missing Message	GO to Pinpoint Test Q
HCM	U0140:87	Lost Communication With Body Control Module: Missing Message	GO to Pinpoint Test R
HCM	U0151:87	Lost Communication With Restraints Control Module: Missing Message	GO to Pinpoint Test S
HCM	U0212:87	Lost Communication With Steering Column Control Module: Missing Message	GO to Pinpoint Test T
HCM	U023A:87	Lost Communication With Image Processing Module A: Missing Message	GO to Pinpoint Test U
HCM	U0401:00	Invalid Data Received from ECM/PCM A: No Sub Type Information	GO to Pinpoint Test J
HCM	U0415:00	Invalid Data Received from Anti-Lock Brake System (ABS) Control Module 'A': No Sub Type Information	GO to Pinpoint Test J
HCM	U0416:00	Invalid Data Received From Vehicle Dynamics Control Module: No Sub Type Information	GO to Pinpoint Test J
HCM	U0420:00	Invalid Data Received from Power Steering Control Module 'A': No Sub Type Information	GO to Pinpoint Test J
HCM	U0422:00	Invalid Data Received From Body Control Module: No Sub Type Information	GO to Pinpoint Test J
HCM	U0429:00	Invalid Data Received From Steering Column Control Module: No Sub Type Information	GO to Pinpoint Test J
HCM	U0452:00	Invalid Data Received From Restraints Control Module: No Sub Type Information	GO to Pinpoint Test J
HCM	U053B:00	Invalid Data Received From Image Processing Module A: No Sub Type Information	GO to Pinpoint Test J
HCM	U2024:51	Control Module Cal-Config Data: Not Programmed	GO to Pinpoint Test I
HCM	U2024:57	Control Module Cal-Config Data: Invalid/Incompatible Software Component	GO to Pinpoint Test I
HCM	U202B:61	In-Use Application Signing Key: Signal Calculation Failure	GO to Pinpoint Test I
HCM	U202B:62	In-Use Application Signing Key: Signal Compare Failure	GO to Pinpoint Test I
HCM	U2100:00	Initial Configuration Not Complete: No Sub Type Information	GO to Pinpoint Test I
HCM	U2101:56	Control Module Configuration Incompatible: Invalid/Incompatible Configuration	GO to Pinpoint Test I
HCM	U2200:45	Control Module Configuration Memory Corrupt: Program Memory Failure	GO to Pinpoint Test I
HCM	U3000:41	Control Module: General Checksum Failure	GO to Pinpoint Test I
HCM	U3000:45	Control Module: Program Memory Failure	GO to Pinpoint Test I
HCM	U3000:46	Control Module: Calibration/Parameter Memory Failure	GO to Pinpoint Test I
HCM	U3003:16	Battery Voltage: Circuit Voltage Below Threshold	GO to Pinpoint Test K
HCM	U3003:17	Battery Voltage: Circuit Voltage Above Threshold	GO to Pinpoint Test L
LDCMA	B123A:87	Left Front Turn Indicator: Missing Message	GO to Pinpoint Test M
LDCMA	B124B:87	Left Daytime Running Light: Missing Message	GO to Pinpoint Test M
LDCMA	B149E:87	Left Front Position/Sidemarker: Missing Message	GO to Pinpoint Test M
LDCMA	B14E5:56	Left Front Enhanced Exterior Lighting System: Invalid/Incompatible Configuration	GO to Pinpoint Test V
LDCMA	B14E5:96	Left Front Enhanced Exterior Lighting System: Component Internal Failure	GO to Pinpoint Test V
LDCMA	B1566:11	Left Front Static Bending Lamp Output: Circuit Short To Ground	GO to Pinpoint Test F
LDCMA	B1566:12	Left Front Static Bending Lamp Output: Circuit Short To Battery	GO to Pinpoint Test F
LDCMA	B1566:13	Left Front Static Bending Lamp Output: Circuit Open	GO to Pinpoint Test F
LDCMA	B1566:14	Left Front Static Bending Lamp Output: Circuit Short To Ground Or Open	GO to Pinpoint Test F
LDCMA	B1566:16	Left Front Static Bending Lamp Output: Circuit Voltage Below Threshold	GO to Pinpoint Test F
LDCMA	B1566:1E	Left Front Static Bending Lamp Output: Circuit Resistance Out Of Range	GO to Pinpoint Test F
LDCMA	B1566:4B	Left Front Static Bending Lamp Output: Over Temperature	GO to Pinpoint Test F
LDCMA	B1566:87	Left Front Static Bending Lamp Output: Missing Message	GO to Pinpoint Test M
LDCMA	B1A57:11	Left Headlamp Leveling Motor: Circuit Short To Ground	GO to Pinpoint Test F
LDCMA	B1A57:13	Left Headlamp Leveling Motor: Circuit Open	GO to Pinpoint Test F
LDCMA	B1A57:16	Left Headlamp Leveling Motor: Circuit Voltage Below Threshold	GO to Pinpoint Test F
LDCMA	B1A57:17	Left Headlamp Leveling Motor: Circuit Voltage Above Threshold	GO to Pinpoint Test F
LDCMA	B1A57:4B	Left Headlamp Leveling Motor: Over Temperature	GO to Pinpoint Test F
LDCMA	B1A57:87	Left Headlamp Leveling Motor: Missing Message	GO to Pinpoint Test F
LDCMA	B1A57:87	Left Headlamp Leveling Motor: Missing Message	GO to Pinpoint Test M
LDCMA	B1A57:A2	Left Headlamp Leveling Motor: System Voltage Low	GO to Pinpoint Test F
LDCMA	B1D00:11	Left Low Beam: Circuit Short To Ground	GO to Pinpoint Test A
LDCMA	B1D00:12	Left Low Beam: Circuit Short To Battery	GO to Pinpoint Test A
LDCMA	B1D00:13	Left Low Beam: Circuit Open	GO to Pinpoint Test A
LDCMA	B1D00:14	Left Low Beam: Circuit Short To Ground Or Open	GO to Pinpoint Test A
LDCMA	B1D00:16	Left Low Beam: Circuit Voltage Below Threshold	GO to Pinpoint Test A
LDCMA	B1D00:1E	Left Low Beam: Circuit Resistance Out Of Range	GO to Pinpoint Test A
LDCMA	B1D00:4B	Left Low Beam: Over Temperature	GO to Pinpoint Test A
LDCMA	B1D00:62	Left Low Beam: Signal Compare Failure	GO to Pinpoint Test A
LDCMA	B1D00:87	Left Low Beam: Missing Message	GO to Pinpoint Test A
LDCMA	B1D00:87	Left Low Beam: Missing Message	GO to Pinpoint Test M
LDCMA	B1D02:11	Left High Beam Circuit: Circuit Short To Ground	GO to Pinpoint Test B
LDCMA	B1D02:12	Left High Beam Circuit: Circuit Short To Battery	GO to Pinpoint Test B
LDCMA	B1D02:13	Left High Beam Circuit: Circuit Open	GO to Pinpoint Test B
LDCMA	B1D02:14	Left High Beam Circuit: Circuit Short To Ground Or Open	GO to Pinpoint Test B
LDCMA	B1D02:16	Left High Beam Circuit: Circuit Voltage Below Threshold	GO to Pinpoint Test B
LDCMA	B1D02:1E	Left High Beam Circuit: Circuit Resistance Out Of Range	GO to Pinpoint Test B
LDCMA	B1D02:4B	Left High Beam Circuit: Over Temperature	GO to Pinpoint Test B
LDCMA	B1D02:87	Left High Beam Circuit: Missing Message	GO to Pinpoint Test B
LDCMA	B1D02:87	Left High Beam Circuit: Missing Message	GO to Pinpoint Test M
LDCMA	U0241:00	Lost Communication With Headlamp Control Module 'A': No Sub Type Information	GO to Pinpoint Test M
LDCMA	U0273:00	Lost Communication With Lighting Driver Control Module 'A': No Sub Type Information	GO to Pinpoint Test V
LDCMA	U0542:00	Invalid Data Received From Headlamp Control Module 'A': No Sub Type Information	GO to Pinpoint Test M
LDCMA	U2100:00	Initial Configuration Not Complete: No Sub Type Information	GO to Pinpoint Test W
LDCMA	U2100:00	Initial Configuration Not Complete: No Sub Type Information	GO to Pinpoint Test W
LDCMA	U3000:45	Control Module: Program Memory Failure	GO to Pinpoint Test W
LDCMA	U3000:45	Control Module: Program Memory Failure	GO to Pinpoint Test W
LDCMA	U3003:16	Battery Voltage: Circuit Voltage Below Threshold	GO to Pinpoint Test V
LDCMA	U3003:17	Battery Voltage: Circuit Voltage Above Threshold	GO to Pinpoint Test V
LDCMA	U3003:A2	Battery Voltage: System Voltage Low	GO to Pinpoint Test V
LDCMA	U3003:A3	Battery Voltage: System Voltage High	GO to Pinpoint Test V
LDCMB	B123B:87	Right Front Turn Indicator: Missing Message	GO to Pinpoint Test M
LDCMB	B124A:87	Right Daytime Running Light: Missing Message	GO to Pinpoint Test M
LDCMB	B149F:87	Right Front Position/Sidemarker: Missing Message	GO to Pinpoint Test M
LDCMB	B14E7:56	Right Front Enhanced Exterior Lighting System: Invalid/Incompatible Configuration	GO to Pinpoint Test V
LDCMB	B14E7:96	Right Front Enhanced Exterior Lighting System: Component Internal Failure	GO to Pinpoint Test V
LDCMB	B1568:11	Right Front Static Bending Lamp Output: Circuit Short To Ground	GO to Pinpoint Test F
LDCMB	B1568:12	Right Front Static Bending Lamp Output: Circuit Short To Battery	GO to Pinpoint Test F
LDCMB	B1568:13	Right Front Static Bending Lamp Output: Circuit Open	GO to Pinpoint Test F
LDCMB	B1568:14	Right Front Static Bending Lamp Output: Circuit Short To Ground Or Open	GO to Pinpoint Test F
LDCMB	B1568:16	Right Front Static Bending Lamp Output: Circuit Voltage Below Threshold	GO to Pinpoint Test F
LDCMB	B1568:1E	Right Front Static Bending Lamp Output: Circuit Resistance Out Of Range	GO to Pinpoint Test F
LDCMB	B1568:4B	Right Front Static Bending Lamp Output: Over Temperature	GO to Pinpoint Test F
LDCMB	B1568:87	Right Front Static Bending Lamp Output: Missing Message	GO to Pinpoint Test M
LDCMB	B1A58:11	Right Headlamp Leveling Motor: Circuit Short To Ground	GO to Pinpoint Test F
LDCMB	B1A58:13	Right Headlamp Leveling Motor: Circuit Open	GO to Pinpoint Test F
LDCMB	B1A58:16	Right Headlamp Leveling Motor: Circuit Voltage Below Threshold	GO to Pinpoint Test F
LDCMB	B1A58:17	Right Headlamp Leveling Motor: Circuit Voltage Above Threshold	GO to Pinpoint Test F
LDCMB	B1A58:4B	Right Headlamp Leveling Motor: Over Temperature	GO to Pinpoint Test F
LDCMB	B1A58:87	Right Headlamp Leveling Motor: Missing Message	GO to Pinpoint Test F
LDCMB	B1A58:87	Right Headlamp Leveling Motor: Missing Message	GO to Pinpoint Test M
LDCMB	B1A58:A2	Right Headlamp Leveling Motor: System Voltage Low	GO to Pinpoint Test F
LDCMB	B1D00:62	Left Low Beam: Signal Compare Failure	GO to Pinpoint Test A
LDCMB	B1D01:11	Right Low Beam: Circuit Short To Ground	GO to Pinpoint Test A
LDCMB	B1D01:12	Right Low Beam: Circuit Short To Battery	GO to Pinpoint Test A
LDCMB	B1D01:13	Right Low Beam: Circuit Open	GO to Pinpoint Test A
LDCMB	B1D01:14	Right Low Beam: Circuit Short To Ground Or Open	GO to Pinpoint Test A
LDCMB	B1D01:16	Right Low Beam: Circuit Voltage Below Threshold	GO to Pinpoint Test A
LDCMB	B1D01:1E	Right Low Beam: Circuit Resistance Out Of Range	GO to Pinpoint Test A
LDCMB	B1D01:4B	Right Low Beam: Over Temperature	GO to Pinpoint Test A
LDCMB	B1D01:87	Right Low Beam: Missing Message	GO to Pinpoint Test A
LDCMB	B1D01:87	Right Low Beam: Missing Message	GO to Pinpoint Test M
LDCMB	B1D03:11	Right High Beam Circuit: Circuit Short To Ground	GO to Pinpoint Test B
LDCMB	B1D03:12	Right High Beam Circuit: Circuit Short To Battery	GO to Pinpoint Test B
LDCMB	B1D03:13	Right High Beam Circuit: Circuit Open	GO to Pinpoint Test B
LDCMB	B1D03:14	Right High Beam Circuit: Circuit Short To Ground Or Open	GO to Pinpoint Test B
LDCMB	B1D03:16	Right High Beam Circuit: Circuit Voltage Below Threshold	GO to Pinpoint Test B
LDCMB	B1D03:1E	Right High Beam Circuit: Circuit Resistance Out Of Range	GO to Pinpoint Test B
LDCMB	B1D03:4B	Right High Beam Circuit: Over Temperature	GO to Pinpoint Test B
LDCMB	B1D03:87	Right High Beam Circuit: Missing Message	GO to Pinpoint Test B
LDCMB	B1D03:87	Right High Beam Circuit: Missing Message	GO to Pinpoint Test M
LDCMB	U0242:00	Lost Communication With Headlamp Control Module 'B': No Sub Type Information	GO to Pinpoint Test M
LDCMB	U0274:00	Lost Communication With Lighting Driver Control Module 'B': No Sub Type Information	GO to Pinpoint Test V
LDCMB	U0543:00	Invalid Data Received From Headlamp Control Module 'B': No Sub Type Information	GO to Pinpoint Test M
LDCMB	U3003:16	Battery Voltage: Circuit Voltage Below Threshold	GO to Pinpoint Test V
LDCMB	U3003:17	Battery Voltage: Circuit Voltage Above Threshold	GO to Pinpoint Test V
LDCMB	U3003:A2	Battery Voltage: System Voltage Low	GO to Pinpoint Test V
LDCMB	U3003:A3	Battery Voltage: System Voltage High	GO to Pinpoint Test V
SCCM	B124C:96	Turn Indicator Stalk Switch Pack: Component Internal Failure	GO to Pinpoint Test E
SCCM	B124C:9E	Turn Indicator Stalk Switch Pack: Stuck On	GO to Pinpoint Test E

Global Customer Symptom Code (GCSC) Chart

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices.
REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).

Symptom	Action
Lighting/Glass/Vision > Exterior Lighting > Headlamp > Appearance	GO to Pinpoint Test F
Lighting/Glass/Vision > Exterior Lighting > Headlamp > Inoperative	GO to Pinpoint Test A
Lighting/Glass/Vision > Exterior Lighting > Headlamp > Inoperative	GO to Pinpoint Test B
Lighting/Glass/Vision > Exterior Lighting > Headlamp > Inoperative	GO to Pinpoint Test C
Lighting/Glass/Vision > Exterior Lighting > Headlamp > Inoperative	GO to Pinpoint Test D
Lighting/Glass/Vision > Exterior Lighting > Headlamp > Stays On	GO to Pinpoint Test A
Lighting/Glass/Vision > Exterior Lighting > Headlamp > Stays On	GO to Pinpoint Test B

Symptom Chart

Symptom Chart: Headlamps

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices.
REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).

Condition	Actions
A module does not respond to the diagnostic scan tool	REFER to: Controller Area Network (CAN) Module Communications Network (418-00A Controller Area Network (CAN) Module Communications Network, Diagnosis and Testing).
One or both low beams is inoperative or always on	GO to Pinpoint Test A
One or both high beams is inoperative or always on	GO to Pinpoint Test B
The flash-to-pass feature is inoperative	GO to Pinpoint Test C
The automatic high beam feature is inoperative	GO to Pinpoint Test D
Automatic headlamp leveling headlamp leveling, adaptive front lighting is inoperative or does not operate correctly	GO to Pinpoint Test F

Pinpoint Tests

PINPOINT TEST A: ONE OR BOTH LOW BEAMS IS INOPERATIVE OR ALWAYS ON

Refer to Wiring Diagrams Cell 85 for schematic and connector information.

Normal Operation and Fault Conditions

REFER to: Exterior Lighting (417-01 Exterior Lighting, Description and Operation).

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
BCM B14E0:11	Exterior Lamps Power Supply 'C': Circuit Short To Ground	A continuous memory and on-demand DTC that sets when the BCM detects a short to ground from the LH low beam output circuit.
BCM B14E0:15	Exterior Lamps Power Supply 'C': Circuit Short To Battery Or Open	A continuous memory and on-demand DTC that sets when the BCM detects a short to voltage from the LH low beam output circuit.
BCM B14E1:11	Exterior Lamps Power Supply 'D': Circuit Short To Ground	A continuous memory and on-demand DTC that sets when the BCM detects an opn from the RH low beam output circuit.
BCM B14E1:15	Exterior Lamps Power Supply 'D': Circuit Short To Battery Or Open	A continuous memory and on-demand DTC that sets when the BCM detects an open or a short to voltage from the RH low beam output circuit.
BCM B1533:02	Headlamp Switch Module: General Signal Failure	A continuous memory and on-demand DTC that sets when the BCM is missing data from the messages sent from the headlamp switch over the LIN circuit.
BCM B1533:08	Headlamp Switch Module: Bus Signal/Message Failures	A continuous memory and on-demand DTC that sets when the BCM has lost communication with the headlamp switch over the LIN circuit.
BCM B1533:49	Headlamp Switch Module: Internal Electronic Failure	A continuous memory and on-demand DTC that sets when the BCM message from the headlamp switch over the LIN circuit the headlamps switch has an internal failure.
BCM B1533:56	Headlamp Switch Module: Invalid/Incompatible Configuration	A continuous memory and on-demand DTC that sets when the BCM , over the LIN circuit, has detected that the headlamp switch is not properly configured.
BCM B1D00:11	Left Low Beam: Circuit Short To Ground	A continuous memory and on-demand DTC that sets when the BCM detects a short to ground from the LH low beam output circuit.
BCM B1D00:15	Left Low Beam: Circuit Short To Battery Or Open	A continuous memory and on-demand DTC that sets when the BCM detects an open from the LH low beam output circuit.
BCM B1D01:11	Right Low Beam: Circuit Short To Ground	A continuous memory and on-demand DTC that sets when the BCM detects a short to ground from the RH low beam output circuit.
BCM B1D01:15	Right Low Beam: Circuit Short To Battery Or Open	A continuous memory and on-demand DTC that sets when the BCM detects an open from the RH low beam output circuit.
LDCMA B1D00:11	Left Low Beam: Circuit Short To Ground	A continuous memory and on-demand DTC that sets when the LDCMA detects a short to ground from the LH headlamp internal low beam circuit.
LDCMA B1D00:12	Left Low Beam: Circuit Short To Battery	A continuous memory and on-demand DTC that sets when the LDCMA detects a short to voltage from the LH headlamp internal low beam circuit.
LDCMA B1D00:13	Left Low Beam: Circuit Open	A continuous memory and on-demand DTC that sets when the LDCMA detects an open from the LH headlamp internal low beam circuit.
LDCMA B1D00:14	Left Low Beam: Circuit Short To Ground Or Open	A continuous memory and on-demand DTC that sets when the LDCMA detects an open or short to ground from the LH headlamp internal low beam circuit.
LDCMA B1D00:16	Left Low Beam: Circuit Voltage Below Threshold	A continuous memory and on-demand DTC that sets when the LDCMA detects a low voltage on the LH headlamp internal low beam circuit.
LDCMA B1D00:1E	Left Low Beam: Circuit Resistance Out Of Range	A continuous memory and on-demand DTC that sets when the LDCMA detects an incorrect resistance on the LH headlamp internal low beam circuit.
LDCMA B1D00:4B	Left Low Beam: Over Temperature	A continuous memory and on-demand DTC that sets when the LDCMA detects a high temperature LH headlamp internal low beam circuit driver.
LDCMA B1D00:62	Left Low Beam: Signal Compare Failure	A continuous memory and on-demand DTC that sets when the LDCMA detects a difference in the low beam state from the HCM over the CAN and the low beam circuit from the BCM .
LDCMA B1D00:87	Left Low Beam: Missing Message	A continuous memory and on-demand DTC that sets when the LDCMA detects a message missing from the HCM over the CAN .
LDCMB B1D01:11	Right Low Beam: Circuit Short To Ground	A continuous memory and on-demand DTC that sets when the LDCMB detects a short to ground from the RH headlamp internal low beam circuit.
LDCMB B1D01:12	Right Low Beam: Circuit Short To Battery	A continuous memory and on-demand DTC that sets when the LDCMB detects a short to voltage from the RH headlamp internal low beam circuit.
LDCMB B1D01:13	Right Low Beam: Circuit Open	A continuous memory and on-demand DTC that sets when the LDCMB detects an open from the RH headlamp internal low beam circuit.
LDCMB B1D01:14	Right Low Beam: Circuit Short To Ground Or Open	A continuous memory and on-demand DTC that sets when the LDCMB detects an open or short to ground from the RH headlamp internal low beam circuit.
LDCMB B1D01:16	Right Low Beam: Circuit Voltage Below Threshold	A continuous memory and on-demand DTC that sets when the LDCMB detects a low voltage on the RH headlamp internal low beam circuit.
LDCMB B1D01:1E	Right Low Beam: Circuit Resistance Out Of Range	A continuous memory and on-demand DTC that sets when the LDCMB detects an incorrect resistance on the RH headlamp internal low beam circuit.
LDCMB B1D01:4B	Right Low Beam: Over Temperature	A continuous memory and on-demand DTC that sets when the LDCMB detects a high temperature RH headlamp internal low beam circuit driver.
LDCMB B1D00:62	Left Low Beam: Signal Compare Failure	A continuous memory and on-demand DTC that sets when the LDCMB detects a difference in the low beam state from the HCM over the CAN and the low beam circuit from the BCM .
LDCMB B1D01:87	Right Low Beam: Missing Message	A continuous memory and on-demand DTC that sets when the LDCMB detects a message missing from the HCM over the CAN .

Possible Sources

Wiring, terminals or connectors
Headlamp assembly
LDCMA ( LH headlamp)
LDCMB ( RH headlamp)
BCM

Visual Inspection and Pre-checks

Inspect the headlamp assembly for damage.
Inspect the headlamp switch for damage.
Verify the BCM fuse 19 (5A) is OK.
Verify the BCMC (also known as the BJB ) fuse 100 (25A) ( LH headlamp) or fuse 101 (25A) ( RH headlamp) is OK.

A1 CHECK THE PARKING LAMPS AND FRONT TURN SIGNAL LAMP OPERATION

Ignition ON.

Activate the hazard lamp function and observe the front turn signal lamps.

Place the headlamp switch in the PARKING LAMPS position.

Place the LH steering column multifunction switch in the high beam position and observe the high beams.

Are the LH low beams, front parking lamps and turn signals all inoperative or are the RH low beams, front parking lamps and turn signals all inoperative?

Yes

VERIFY the BCMC (also known as the BJB ) fuse 100 (25A) ( LH headlamp) or fuse 101 (25A) ( RH headlamp) is OK. If OK, GO to A2 If not OK, REFER to the Wiring Diagrams manual to identify the possible causes of the circuit short.

No	If the LH and RH low beams are inoperative or are always ON, GO to A15 If only the LH low beams or only the RH low beams are inoperative or not operating correctly, GO to A4 If only the LH low beams or only the RH low beams are always on, GO to A21

A2 CHECK THE HEADLAMP MOUNTED LDCM (LIGHTING DRIVER CONTROL MODULE) VOLTAGE CIRCUIT FOR AN OPEN

Ignition OFF.

Disconnect: Suspect LH Headlamp C1758 or RH Headlamp C1759.

Ignition ON.

Measure:
Click to display connectors
LH Headlamp

Positive Lead Measurement / Action Negative Lead

C1758-1 Ground

Click to display connectors
RH Headlamp

Positive Lead Measurement / Action Negative Lead

C1759-1 Ground

Is the voltage greater than 11 volts?

Yes

GO to A3

No	REPAIR the circuit.

A3 CHECK THE HEADLAMP MOUNTED LDCM (LIGHTING DRIVER CONTROL MODULE) GROUND CIRCUITS FOR AN OPEN

Measure:
Click to display connectors
LH Headlamp

Positive Lead Measurement / Action Negative Lead

C1758-1 C1758-2

Click to display connectors
RH Headlamp

Positive Lead Measurement / Action Negative Lead

C1759-1 C1759-2

Is the voltage greater than 11 volts?

Yes

GO to A21

No	REPAIR the circuit.

A4 CHECK FOR LDCMA (LIGHTING DRIVER CONTROL MODULE A) OR LDCMB (LIGHTING DRIVER CONTROL MODULE B) DIAGNOSTIC TROUBLE CODES (DTCS)

Using a diagnostic scan tool, perform the LDCMA ( LH headlamp) or LDCMB ( RH headlamp) self-test.

Is LDCMA DTC B1D00:16, B1D00:1E or B1D00:4B or LDCMB DTC B1D01:16, B1D01:1E or B1D01:4B present?

Yes

GO to A5

GO to A8

A5 CHECK FOR LDCMA (LIGHTING DRIVER CONTROL MODULE A) OR LDCMB (LIGHTING DRIVER CONTROL MODULE B) DIAGNOSTIC TROUBLE CODES (DTCS) AFTER A COOL DOWN PERIOD

Place the headlamp switch in the OFF position.

Ignition OFF.

Allow the vehicles and headlamps to cool to room temperature.

Ignition ON.

Place the headlamp switch in the HEADLAMPS position.

After the headlamps cool, using a diagnostic scan tool, perform the LDCMA ( LH headlamp) or LDCMB ( RH headlamp) self-test.

Is LDCMA DTC B1D00:16, B1D00:1E or B1D00:4B or LDCMB DTC B1D01:16, B1D01:1E or B1D01:4B present?

Yes

GO to A21

GO to A6

A6 RECHECK THE LOW BEAMS

Observe the low beams.

Do the low beams operate correctly?

Yes

GO to A7

GO to A8

A7 CHECK THE VEHICLE HISTORY

Check the vehicle history for LDCMA DTC B1D00:16, B1D00:1E or B1D00:4B or LDCMB DTC B1D01:16, B1D01:1E or B1D01:4B

Has the vehicle set the same DTC in the past?

Yes

GO to A8

No	INSPECT the front turn signal lamp, wiring, headlamp and LDCM for damage. REPAIR the wiring or REPLACE any damaged components. If not signs of damage are found, the system is operating correctly at this time.

A8 CHECK THE HEADLAMP MOUNTED LDCM (LIGHTING DRIVER CONTROL MODULE) VOLTAGE CIRCUITS FOR AN OPEN

Place the headlamp switch in the OFF position.

Ignition OFF.

Disconnect: Suspect LH Headlamp C1758 or RH Headlamp C1759.

Ignition ON.

Place the headlamp switch in the HEADLAMPS position.

Measure:
Click to display connectors
LH Headlamp

Positive Lead Measurement / Action Negative Lead

C1758-1 Ground

C1758-9 Ground

Click to display connectors
RH Headlamp

Positive Lead Measurement / Action Negative Lead

C1759-1 Ground

C1759-9 Ground

Is the voltage greater than 11 volts?

Yes

GO to A9

No	REPAIR the circuit.

A9 CHECK THE HEADLAMP MOUNTED LDCM (LIGHTING DRIVER CONTROL MODULE) GROUND CIRCUIT FOR AN OPEN

Measure:
Click to display connectors
LH Headlamp

Positive Lead Measurement / Action Negative Lead

C1758-1 C1758-2

C1758-1 C1758-10

Click to display connectors
RH Headlamp

Positive Lead Measurement / Action Negative Lead

C1759-1 C1759-2

C1759-1 C1759-10

Is the voltage greater than 11 volts?

Yes

GO to A10

No	REPAIR the circuit.

A10 CHECK FOR LOW BEAM VOLTAGE AT THE HEADLAMP

Measure:
Click to display connectors
LH Headlamp

Positive Lead Measurement / Action Negative Lead

C1758-3 Ground

Click to display connectors
RH Headlamp

Positive Lead Measurement / Action Negative Lead

C1759-3 Ground

Is the voltage greater than 11 volts?

Yes

GO to A12

GO to A11

A11 REPEAT THE ON-DEMAND SELF-TEST AND CHECK FOR LOW BEAM VOLTAGE TO THE HEADLAMP

Place the headlamp switch in the OFF position.

Using a diagnostic scan tool, perform the BCM self-test.

Clear the Diagnostic Trouble Codes (DTCs) and repeat the self-test (required to enable the lamp output driver).

Ignition OFF.

Ignition ON.

Place the headlamp switch in the HEADLAMPS position.

Measure:
Click to display connectors
LH Headlamp

Positive Lead Measurement / Action Negative Lead

C1758-3 Ground

Click to display connectors
RH Headlamp

Positive Lead Measurement / Action Negative Lead

C1759-3 Ground

Is the voltage greater than 11 volts?

Yes

GO to A21

GO to A13

A12 CHECK THE HEADLAMP GROUND CIRCUIT FOR AN OPEN

For low series headlamps, measure:
Click to display connectors
LH Headlamp

Positive Lead Measurement / Action Negative Lead

C1758-3 C1758-10

C1758-3 C1758-2

Click to display connectors
RH Headlamp

Positive Lead Measurement / Action Negative Lead

C1759-3 C1759-10

C1759-3 C1759-2

Is the voltage greater than 11 volts?

Yes

GO to A21

No	REPAIR the circuit in question.

A13 CHECK THE LOW BEAM SUPPLY CIRCUIT FOR A SHORT TO GROUND

Ignition OFF.

Place the headlamp switch in the OFF position.

Disconnect: BCM C2280G.

Measure:
Click to display connectors
LH Headlamp

Positive Lead Measurement / Action Negative Lead

C1758-3 Ground

Click to display connectors
RH Headlamp

Positive Lead Measurement / Action Negative Lead

C1759-3 Ground

Is the resistance greater than 10,000 ohms?

Yes

GO to A14

REPAIR the circuit. After the repair:
If no Diagnostic Trouble Codes (DTCs) are present, TEST the system for normal operation.
If DTC U1000:00 is present, CLEAR the Diagnostic Trouble Codes (DTCs) and REPEAT the self-test (required to enable the lamp output driver if DTC U1000:00 is present).
If DTC U3000:49 is present, INSTALL a new BCM .
REFER to: Body Control Module (BCM) (419-10 Multifunction Electronic Modules, Removal and Installation).

A14 CHECK THE LOW BEAM SUPPLY CIRCUIT FOR AN OPEN

Measure:
Click to display connectors
LH Headlamp

Positive Lead Measurement / Action Negative Lead

C1758-3 C2280G-4

Click to display connectors
RH Headlamp

Positive Lead Measurement / Action Negative Lead

C1759-3 C2280G-2

Is the resistance less than 3 ohms?

Yes

GO to A22

No	REPAIR the circuit.

A15 CHECK FOR BCM (BODY CONTROL MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)

Ignition ON.

Using a diagnostic scan tool, perform the BCM self-test.

Is DTC B1533:02, B1533:08, B1533:49 or B1533:56 present?

Yes

For BCM DTC B1533:02 or B1533:08, GO to A16
For BCM DTC B1533:49, INSTALL a new headlamp switch.
REFER to: Headlamp Switch (417-01 Exterior Lighting, Removal and Installation). For BCM DTC B1533:56, using the diagnostic scan tool, execute the BCM LIN New Module Initialization routine. Follow the diagnostic scan tool directions. If the initialization routine fails, INSTALL a new headlamp switch.
REFER to: Headlamp Switch (417-01 Exterior Lighting, Removal and Installation).

No	INSTALL a new headlamp switch. REFER to: Headlamp Switch (417-01 Exterior Lighting, Removal and Installation). TEST the system for normal operation. If the low beams still do not operate correctly. GO to A22

A16 CHECK THE HEADLAMP SWITCH VOLTAGE SUPPLY CIRCUIT FOR AN OPEN

Ignition OFF.

Disconnect: Headlamp Switch C205.

Ignition ON.

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

C205-8 Ground

Is the voltage greater than 11 volts?

Yes

GO to A17

No	VERIFY the BCM fuse 19 (5A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the Wiring Diagram manual to identify the possible causes of the circuit short.

A17 CHECK THE HEADLAMP SWITCH GROUND CIRCUIT FOR AN OPEN

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

C205-8 C205-1

Is the voltage greater than 11 volts?

Yes

GO to A18

No	REPAIR the circuit.

A18 CHECK THE LIN (LOCAL INTERCONNECT NETWORK) CIRCUIT TO THE HEADLAMP SWITCH FOR AN OPEN

Ignition OFF.

Disconnect: BCM C2280B.

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

C205-6 C2280B-49

Is the resistance less than 3 ohms?

Yes

GO to A19

No	REPAIR the circuit.

A19 CHECK THE LIN (LOCAL INTERCONNECT NETWORK) CIRCUIT FOR A SHORT TO VOLTAGE

Using the Terminal Release Kit, release and temporarily remove BCM C2280B-49.

Connect: BCM C2280B.

Ignition ON.

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

C2280B-49 Ground

Is any voltage present?

Yes

REPAIR the circuit.

GO to A20

A20 CHECK THE LIN (LOCAL INTERCONNECT NETWORK) CIRCUIT FOR A SHORT TO GROUND

Ignition OFF.

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

C2280B-49 Ground

Is the resistance greater than 10,000 ohms?

Yes

INSTALL a new headlamp switch.
REFER to: Headlamp Switch (417-01 Exterior Lighting, Removal and Installation).
TEST the system for normal operation. If the low beams continue to illuminate, GO to A22

No	REPAIR the circuit.

A21 CHECK THE HEADLAMP MOUNTED LDCM (LIGHTING DRIVER CONTROL MODULE)

Place the headlamp switch in the OFF positions.

Ignition OFF.

INSTALL a new LDCM on the suspect headlamp.
REFER to: Lighting Driver Control Module (417-01 Exterior Lighting, Removal and Installation).

Ignition ON.

Using a diagnostic scan tool, complete the PMI process for the LDCMA ( LH headlamp) or for the LDCMB ( RH headlamp) following the on-screen instructions.

Place the headlamp switch in the PARKING LAMPS positions.

CLEAR the Diagnostic Trouble Codes (DTCs), REPEAT the self-test (required to enable the lamp output driver) and cycle the ignition OFF and ON. REPEAT the self-test.

Is the concern still present or does any Diagnostic Trouble Codes (DTCs) return?

Yes

REMOVE the known good LDCM control module. INSTALL a new headlamp assembly.
REFER to: Headlamp Assembly (417-01 Exterior Lighting, Removal and Installation).

No	The system is operating correctly at this time. The concern may was caused by the LDCM .

A22 CHECK FOR CORRECT BCM (BODY CONTROL MODULE) OPERATION

Disconnect and inspect all BCM and all related in-line connectors.

Repair:
- corrosion (install new connector or terminals – clean module pins)
- damaged or bent pins – install new terminals/pins
- pushed-out pins – install new pins as necessary

Reconnect the BCM and all related in-line connectors. Make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new BCM .
REFER to: Body Control Module (BCM) (419-10 Multifunction Electronic Modules, Removal and Installation).

No	The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST B: ONE OR BOTH HIGH BEAMS IS INOPERATIVE OR ALWAYS ON

Refer to Wiring Diagrams Cell 85 for schematic and connector information.

Normal Operation and Fault Conditions

REFER to: Exterior Lighting (417-01 Exterior Lighting, Description and Operation).

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
LDCMA B1D02:11	Left High Beam Circuit: Circuit Short To Ground	A continuous memory and on-demand DTC that sets when the LDCMA detects a short to ground from the LH headlamp internal high beam circuit.
LDCMA B1D02:12	Left High Beam Circuit: Circuit Short To Battery	A continuous memory and on-demand DTC that sets when the LDCMA detects a short to voltage from the LH headlamp internal high beam circuit.
LDCMA B1D02:13	Left High Beam Circuit: Circuit Open	A continuous memory and on-demand DTC that sets when the LDCMA detects an open from the LH headlamp internal high beam circuit.
LDCMA B1D02:14	Left High Beam Circuit: Circuit Short To Ground Or Open	A continuous memory and on-demand DTC that sets when the LDCMA detects an open or short to ground from the LH headlamp internal high beam circuit.
LDCMA B1D02:16	Left High Beam Circuit: Circuit Voltage Below Threshold	A continuous memory and on-demand DTC that sets when the LDCMA detects a high voltage on the LH headlamp internal high beam circuit.
LDCMA B1D02:1E	Left High Beam Circuit: Circuit Resistance Out Of Range	A continuous memory and on-demand DTC that sets when the LDCMA detects an incorrect resistance on the LH headlamp internal high beam circuit.
LDCMA B1D02:4B	Left High Beam Circuit: Over Temperature	A continuous memory and on-demand DTC that sets when the LDCMA detects a high temperature LH headlamp internal high beam circuit driver.
LDCMA B1D02:87	Left High Beam Circuit: Missing Message	A continuous memory and on-demand DTC that sets when the LDCMA detects a message missing from the HCM over the CAN .
LDCMB B1D03:11	Right High Beam Circuit: Circuit Short To Ground	A continuous memory and on-demand DTC that sets when the LDCMB detects a short to ground from the RH headlamp internal high beam circuit.
LDCMB B1D03:12	Right High Beam Circuit: Circuit Short To Battery	A continuous memory and on-demand DTC that sets when the LDCMB detects a short to voltage from the RH headlamp internal high beam circuit.
LDCMB B1D03:13	Right High Beam Circuit: Circuit Open	A continuous memory and on-demand DTC that sets when the LDCMB detects an open from the RH headlamp internal high beam circuit.
LDCMB B1D03:14	Right High Beam Circuit: Circuit Short To Ground Or Open	A continuous memory and on-demand DTC that sets when the LDCMB detects an open or short to ground from the RH headlamp internal high beam circuit.
LDCMB B1D03:16	Right High Beam Circuit: Circuit Voltage Below Threshold	A continuous memory and on-demand DTC that sets when the LDCMB detects a high voltage on the RH headlamp internal high beam circuit.
LDCMB B1D03:1E	Right High Beam Circuit: Circuit Resistance Out Of Range	A continuous memory and on-demand DTC that sets when the LDCMB detects an incorrect resistance on the RH headlamp internal high beam circuit.
LDCMB B1D03:4B	Right High Beam Circuit: Over Temperature	A continuous memory and on-demand DTC that sets when the LDCMB detects a high temperature RH headlamp internal high beam circuit driver.
LDCMB B1D03:87	Right High Beam Circuit: Missing Message	A continuous memory and on-demand DTC that sets when the LDCMB detects a message missing from the HCM over the CAN .

Possible Sources

Fuse
Wiring, terminals or connectors
Headlamp assembly
LH steering column multifunction switch
SCCM
LDCMA ( LH headlamp)
LDCMB ( RH headlamp)

Visual Inspection and Pre-checks

Inspect the headlamp assembly for damage.

B1 CHECK THE HIGH AND LOW BEAM OPERATION

Ignition ON.

Place the headlamp switch in the HEADLAMPS position.

Place the LH steering column multifunction switch in the HIGH BEAM position and observe the headlamps.

Place the LH steering column multifunction switch in the LOW BEAM position and observe the headlamps.

Are both high beams inoperative or always on?

Yes

GO to B2

No	If the low beams operate correctly, GO to B3 If the low beams do not operate correctly, GO to Pinpoint Test A

B2 CHECK THE LH (LEFT-HAND) MULTIFUNCTION SWITCH INPUT

While placing the LH steering column multifunction switch in the HIGH BEAM and LOW BEAM positions monitor the following Parameter Identifications (PIDs):
- Access the SCCM and monitor the HIGH_BEAM_SW PID
- Access the SCCM and monitor the LOW_BEAM_SW PID

Do the PID values agree with the LH steering column multifunction switch position?

Yes

GO to B15

No	INSTALL a new LH steering column multifunction switch. REFER to: Steering Column Multifunction Switch LH (211-05 Steering Wheel and Column Electrical Components, Removal and Installation). TEST the system for normal operation. If the concern still exists, GO to B14

B3 CHECK THE PARKING LAMPS AND FRONT TURN SIGNAL LAMP OPERATION

Ignition ON.

Activate the hazard lamp function and observe the front turn signal lamps.

Place the headlamp switch in the PARKING LAMPS position.

Are the LH low beams, front parking lamps and turn signals all inoperative or are the RH low beams, front parking lamps and turn signals all inoperative?

Yes

VERIFY the BCMC (also known as the BJB ) fuse 100 (25A) ( LH headlamp) or fuse 101 (25A) ( RH headlamp) is OK. If OK, GO to B4 If not OK, REFER to the Wiring Diagrams manual to identify the possible causes of the circuit short.

GO to B6

B4 CHECK THE HEADLAMP MOUNTED LDCM (LIGHTING DRIVER CONTROL MODULE) VOLTAGE CIRCUIT FOR AN OPEN

Ignition OFF.

Disconnect: Suspect LH Headlamp C1758 or RH Headlamp C1759.

Ignition ON.

Measure:
Click to display connectors
LH Headlamp

Positive Lead Measurement / Action Negative Lead

C1758-1 Ground

Click to display connectors
RH Headlamp

Positive Lead Measurement / Action Negative Lead

C1759-1 Ground

Is the voltage greater than 11 volts?

Yes

GO to B5

No	REPAIR the circuit.

B5 CHECK THE HEADLAMP MOUNTED LDCM (LIGHTING DRIVER CONTROL MODULE) GROUND CIRCUITS FOR AN OPEN

Measure:
Click to display connectors
LH Headlamp

Positive Lead Measurement / Action Negative Lead

C1758-1 C1758-2

Click to display connectors
RH Headlamp

Positive Lead Measurement / Action Negative Lead

C1759-1 C1759-2

Is the voltage greater than 11 volts?

Yes

GO to B12

No	REPAIR the circuit.

B6 CHECK FOR LDCMA (LIGHTING DRIVER CONTROL MODULE A) OR LDCMB (LIGHTING DRIVER CONTROL MODULE B) DIAGNOSTIC TROUBLE CODES (DTCS)

Using a diagnostic scan tool, perform the LDCMA ( LH headlamp) or LDCMB ( RH headlamp) self-test.

Is LDCMA DTC B1D02:16, B1D02:1E or B1D02:4B or LDCMB DTC B1D03:16, B1D03:1E or B1D03:4B present?

Yes

GO to B7

GO to B10

B7 CHECK FOR LDCMA (LIGHTING DRIVER CONTROL MODULE A) OR LDCMB (LIGHTING DRIVER CONTROL MODULE B) DIAGNOSTIC TROUBLE CODES (DTCS) AFTER A COOL DOWN PERIOD

Place the LH steering column multifunction switch in the LOW BEAM position.

Place the headlamp switch in the OFF position.

Ignition OFF.

Allow the vehicles and headlamps to cool to room temperature.

Ignition ON.

Place the headlamp switch in the HEADLAMPS position.

Place the LH steering column multifunction switch in the HIGH BEAM position.

After the headlamps cool, using a diagnostic scan tool, perform the LDCMA ( LH headlamp) or LDCMB ( RH headlamp) self-test.

Is LDCMA DTC B1D02:16, B1D02:1E or B1D02:4B or LDCMB DTC B1D03:16, B1D03:1E or B1D03:4B present?

Yes

GO to B12

GO to B8

B8 RECHECK THE HIGH BEAMS

Observe the low beams.

Do the high beams operate correctly?

Yes

GO to B9

GO to B10

B9 CHECK THE VEHICLE HISTORY

Check the vehicle history for LDCMA DTC B1D02:16, B1D02:1E or B1D02:4B or LDCMB DTC B1D03:16, B1D03:1E or B1D03:4B.

Has the vehicle set the same DTC in the past?

Yes

GO to B10

No	INSPECT the front turn signal lamp, wiring, headlamp and LDCM for damage. REPAIR the wiring or REPLACE any damaged components. If not signs of damage are found, the system is operating correctly at this time.

B10 CHECK THE HEADLAMP MOUNTED LDCM (LIGHTING DRIVER CONTROL MODULE) VOLTAGE CIRCUITS FOR AN OPEN

Place the LH steering column multifunction switch in the LOW BEAM position.

Place the headlamp switch in the OFF position.

Ignition OFF.

Disconnect: Suspect LH Headlamp C1758 or RH Headlamp C1759.

Ignition ON.

Place the headlamp switch in the HEADLAMPS position.

Measure:
Click to display connectors
LH Headlamp

Positive Lead Measurement / Action Negative Lead

C1758-1 Ground

C1758-9 Ground

Click to display connectors
RH Headlamp

Positive Lead Measurement / Action Negative Lead

C1759-1 Ground

C1759-9 Ground

Is the voltage greater than 11 volts?

Yes

GO to B11

No	REPAIR the circuit.

B11 CHECK THE HEADLAMP MOUNTED LDCM (LIGHTING DRIVER CONTROL MODULE) GROUND CIRCUIT FOR AN OPEN

Measure:
Click to display connectors
LH Headlamp

Positive Lead Measurement / Action Negative Lead

C1758-1 C1758-2

C1758-1 C1758-10

Click to display connectors
RH Headlamp

Positive Lead Measurement / Action Negative Lead

C1759-1 C1759-2

C1759-1 C1759-10

Is the voltage greater than 11 volts?

Yes

GO to B12

No	REPAIR the circuit.

B12 CHECK THE HEADLAMP MOUNTED LDCM (LIGHTING DRIVER CONTROL MODULE) PROGRAMMING

Place the LH steering column multifunction switch in the LOW BEAM position.

Place the headlamp switch in the OFF positions.

Using a diagnostic scan tool, complete the PMI process for the LDCMA ( LH headlamp) or for the LDCMB ( RH headlamp) following the on-screen instructions.

Place the headlamp switch in the HEADLAMPS positions.

Place the LH steering column multifunction switch in the HIGH BEAM position.

REPEAT the LDCMA or LDCMB self-test.

Is the concern still present or does any Diagnostic Trouble Codes (DTCs) return?

Yes

GO to B13

No	The system is operating correctly at this time. The concern may was caused by the LDCM .

B13 CHECK THE HEADLAMP MOUNTED LDCM (LIGHTING DRIVER CONTROL MODULE)

Place the LH steering column multifunction switch in the LOW BEAM position.

Place the headlamp switch in the OFF positions.

Ignition OFF.

Reinstall the original headlamp assembly for the inoperative side of the vehicle.

INSTALL a new LDCM on the suspect headlamp.
REFER to: Lighting Driver Control Module (417-01 Exterior Lighting, Removal and Installation).

Ignition ON.

Using a diagnostic scan tool, complete the PMI process for the LDCMA ( LH headlamp) or for the LDCMB ( RH headlamp) following the on-screen instructions.

Place the headlamp switch in the HEADLAMPS positions.

REPEAT the LDCMA or LDCMB self-test.

Is the concern still present or does any Diagnostic Trouble Codes (DTCs) return?

Yes

REMOVE the known good LDCM control module. INSTALL a new headlamp assembly.
REFER to: Headlamp Assembly (417-01 Exterior Lighting, Removal and Installation).

No	The system is operating correctly at this time. The concern may was caused by the LDCM .

B14 CHECK FOR CORRECT SCCM (STEERING COLUMN CONTROL MODULE) OPERATION

Disconnect and inspect all SCCM connectors.

Repair:
- corrosion (install new connector or terminals – clean module pins)
- damaged or bent pins – install new terminals/pins
- pushed-out pins – install new pins as necessary

Reconnect the SCCM connectors. Make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new SCCM .
REFER to: Steering Column Control Module (SCCM) (211-05 Steering Wheel and Column Electrical Components, Removal and Installation).

No	The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.

B15 CHECK FOR CORRECT BCM (BODY CONTROL MODULE) OPERATION

Disconnect and inspect all BCM and all related in-line connectors.

Repair:
- corrosion (install new connector or terminals – clean module pins)
- damaged or bent pins – install new terminals/pins
- pushed-out pins – install new pins as necessary

Reconnect the BCM and all related in-line connectors. Make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

No	The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST C: THE FLASH-TO-PASS FEATURE IS INOPERATIVE

Normal Operation and Fault Conditions

REFER to: Exterior Lighting (417-01 Exterior Lighting, Description and Operation).

Possible Sources

LH steering column multifunction switch
SCCM

Visual Inspection and Pre-checks

Inspect the LH steering column multifunction switch for damage.

C1 CHECK THE HIGH BEAM OPERATION

Ignition ON.

Place the headlamp switch in the HEADLAMPS ON position.

Activate and deactivate the high beams using the high beam function of the LH steering column multifunction switch.

Do the high beams operate correctly?

Yes

GO to C2

No	GO to Pinpoint Test B

C2 CHECK THE LH (LEFT-HAND) MULTIFUNCTION SWITCH INPUT

While placing the LH steering column multifunction switch in the FLASH-to-PASS and LOW BEAM positions,
Access the SCCM and monitor the FLASH-to-PASS PID

Does the PID value agree with the LH steering column multifunction switch position?

Yes

GO to C4

No	INSTALL a new LH steering column multifunction switch. REFER to: Steering Column Multifunction Switch LH (211-05 Steering Wheel and Column Electrical Components, Removal and Installation). TEST the system for normal operation. If the concern still exists, GO to C3

C3 CHECK FOR CORRECT SCCM (STEERING COLUMN CONTROL MODULE) OPERATION

Disconnect and inspect all SCCM connectors.

Repair:
- corrosion (install new connector or terminals – clean module pins)
- damaged or bent pins – install new terminals/pins
- pushed-out pins – install new pins as necessary

Reconnect the SCCM connectors. Make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new SCCM .
REFER to: Steering Column Control Module (SCCM) (211-05 Steering Wheel and Column Electrical Components, Removal and Installation).

No	The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.

C4 CHECK FOR CORRECT BCM (BODY CONTROL MODULE) OPERATION

Disconnect and inspect all BCM connectors.

Repair:
- corrosion (install new connector or terminals – clean module pins)
- damaged or bent pins – install new terminals/pins
- pushed-out pins – install new pins as necessary

Reconnect the BCM connectors. Make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

No	The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST D: THE AUTOMATIC HIGH BEAM FEATURE IS INOPERATIVE

Refer to Wiring Diagrams Cell 85 for schematic and connector information.

Normal Operation and Fault Conditions

REFER to: Exterior Lighting (417-01 Exterior Lighting, Description and Operation).

The IPMA controls the automatic high beam feature when active.

The IPMA turns the high beam headlamps on when the following conditions are met:

The feature has been enabled using the message center
The headlamp switch is in the AUTOLAMPS position and the autolamps feature has turned the exterior lamps on
The vehicle speed is greater than 51 km/h (32 mph)
The IPMA determines the ambient lighting conditions are dark enough
The IPMA does not detect any light source that can be interpreted as an illuminated vehicle lamp

The IPMA turns the high beams off if any of the following occur:

The IPMA detects any light source that can be interpreted as an illuminated vehicle lamp
The IPMA determines the ambient lighting conditions are not dark enough
The vehicle speed falls below 44 km/h (27 mph)
The autolamps are turned off
The IPMA determines the view is blocked

Possible Sources

Windshield debris
IPMA

NOTE: In cold weather conditions (4°C [40°F] or less), the auto high beams are inhibited for 10 minutes to allow the camera windshield defrost heater to clear the windshield in front of the auto high beam camera.

D1 VERIFY THE HIGH BEAM HEADLAMP OPERATION

Place the headlamp switch in the HEADLAMPS ON position.

Place the RH steering column multifunction switch in the HIGH BEAM position while observing the headlamps.

Do the high beam headlamps illuminate?

Yes

GO to D2

No	GO to Pinpoint Test B

D2 CHECK FOR IPMA (IMAGE PROCESSING MODULE A) DIAGNOSTIC TROUBLE CODE (DTCS)

Ignition ON.

Using a diagnostic scan tool, perform the IPMA self-test.

Are any IPMA Diagnostic Trouble Code (DTCs) present?

Yes

REFER to: Lane Keeping System (419-07 Lane Keeping System, Diagnosis and Testing).

GO to D3

D3 VERIFY THE AUTOMATIC HIGH BEAM SENSOR IS NOT BLOCKED

Visually verify the automatic high beam sensor is not blocked. Sources of blockage can include:
- stickers, window decals or tags.
- non-OEM window tinting.

Was the automatic high beam sensor blocked?

Yes

If possible, REMOVE the blockage. If the blockage cannot be removed, REVIEW the operation of the automatic high beams with the customer.

No	INSTALL a new IPMA . REFER to: Image Processing Module A (IPMA) Camera (419-07 Lane Keeping System, Removal and Installation).

PINPOINT TEST E: B1007:09

Normal Operation and Fault Conditions

REFER to: Exterior Lighting (417-01 Exterior Lighting, Description and Operation).

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
SCCM B124C:96	Turn Indicator Stalk Switch Pack: Component Internal Failure	A continuous memory and on-demand DTC that sets when the SCCM detects an internal failure from the LH steering column multifunction switch.
SCCM B124C:9E	Turn Indicator Stalk Switch Pack: Stuck On	A continuous memory and on-demand DTC that sets when the SCCM detects that the LH steering column multifunction switch has been in a switched position for at least 2 minutes.

Possible Sources

Wiring, terminals or connectors
LH steering column multifunction switch
SCCM

E1 CHECK THE LH (LEFT-HAND) STEERING COLUMN MULTIFUNCTION SWITCH

INSTALL a new LH steering column multifunction switch.
REFER to: Steering Column Multifunction Switch LH (211-05 Steering Wheel and Column Electrical Components, Removal and Installation).

Ignition ON.

Using a diagnostic scan tool, perform the SCCM self-test.

Clear the Diagnostic Trouble Codes (DTCs) and repeat the self-test.

Ignition OFF.

Ignition ON.

Using a diagnostic scan tool, perform the SCCM self-test.

Does SCCM DTC B1007:09 or the condition return?

Yes

The system is operating correctly. The concern was caused by the LH steering column multifunction switch.

GO to E2

E2 CHECK FOR CORRECT SCCM (STEERING COLUMN CONTROL MODULE) OPERATION

Disconnect and inspect all SCCM connectors.

Repair:
- corrosion (install new connector or terminals – clean module pins)
- damaged or bent pins – install new terminals/pins
- pushed-out pins – install new pins as necessary

Reconnect the SCCM connectors. Make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new SCCM .
REFER to: Steering Column Control Module (SCCM) (211-05 Steering Wheel and Column Electrical Components, Removal and Installation).

No	The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST F: AUTOMATIC HEADLAMP LEVELING HEADLAMP LEVELING, CORNERING LAMPS OR ADAPTIVE FRONT LIGHTING IS INOPERATIVE OR DOES NOT OPERATE CORRECTLY

Refer to Wiring Diagrams Cell 85 for schematic and connector information.

Normal Operation and Fault Conditions

REFER to: Exterior Lighting (417-01 Exterior Lighting, Description and Operation).

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
HCM B1437:01	Left Levelling Actuator: General Electrical Failure	A continuous memory DTC that sets when the HCM receives a unspecified failure message from the LDCMA on the LH headlamp.
HCM B1437:87	Left Levelling Actuator: Missing Message	A continuous memory DTC that sets when the HCM does not receive a left levelling actuator message from the LDCMA on the LH headlamp.
HCM B1439:01	Right Levelling Actuator: General Electrical Failure	A continuous memory DTC that sets when the HCM receives a unspecified failure message from the LDCMB on the RH headlamp.
HCM B1439:87	Right Levelling Actuator: Missing Message	A continuous memory DTC that sets when the HCM does not receive a left levelling actuator message from the LDCMB on the RH headlamp.
LDCMA B1566:11	Left Front Static Bending Lamp Output: Circuit Short To Ground	A continuous memory and on-demand DTC that sets when the LDCMA detects a short to ground from the LH cornering lamp LED output circuit.
LDCMA B1566:12	Left Front Static Bending Lamp Output: Circuit Short To Battery	A continuous memory and on-demand DTC that sets when the LDCMA detects a short to voltage from the LH cornering lamp LED output circuit.
LDCMA B1566:13	Left Front Static Bending Lamp Output: Circuit Open	A continuous memory and on-demand DTC that sets when the LDCMA detects an open from the LH cornering lamp LED output circuit.
LDCMA B1566:14	Left Front Static Bending Lamp Output: Circuit Short To Ground Or Open	A continuous memory and on-demand DTC that sets when the LDCMA detects an open or short to ground from the LH cornering lamp LED output circuit.
LDCMA B1566:16	Left Front Static Bending Lamp Output: Circuit Voltage Below Threshold	A continuous memory and on-demand DTC that sets when the LDCMA detects a low voltage from the LH cornering lamp LED output circuit.
LDCMA B1566:1E	Left Front Static Bending Lamp Output: Circuit Resistance Out Of Range	A continuous memory and on-demand DTC that sets when the LDCMA detects a resistance out of the calibrated range from the LH cornering lamp LED output circuit.
LDCMA B1566:4B	Left Front Static Bending Lamp Output: Over Temperature	A continuous memory and on-demand DTC that sets when the LDCMA detects a high temperature from the LH cornering lamp LED output circuit.
LDCMA B1A57:11	Left Headlamp Leveling Motor: Circuit Short To Ground	A continuous memory and on-demand DTC that sets when the LDCMA detects a short to ground from the LH headlamp internal leveling motor circuit.
LDCMA B1A57:13	Left Headlamp Leveling Motor: Circuit Open	A continuous memory and on-demand DTC that sets when the LDCMA detects an open from the LH headlamp internal leveling motor circuit.
LDCMA B1A57:16	Left Headlamp Leveling Motor: Circuit Voltage Below Threshold	A continuous memory and on-demand DTC that sets when the LDCMA detects a low voltage on the LH headlamp internal leveling motor circuit.
LDCMA B1A57:17	Left Headlamp Leveling Motor: Circuit Voltage Above Threshold	A continuous memory and on-demand DTC that sets when the LDCMA detects a high voltage on the LH headlamp internal leveling motor circuit.
LDCMA B1A57:4B	Left Headlamp Leveling Motor: Over Temperature	A continuous memory and on-demand DTC that sets when the LDCMA detects a high temperature LH headlamp internal leveling motor circuit driver.
LDCMA B1A57:87	Left Headlamp Leveling Motor: Missing Message	A continuous memory and on-demand DTC that sets when the LDCMA detects a message missing from the HCM over the CAN .
LDCMA B1A57:A2	Left Headlamp Leveling Motor: System Voltage Low	A continuous memory and on-demand DTC that sets when the LDCMA detects a low voltage on the LH headlamp internal leveling motor circuit.
LDCMB B1568:11	Right Front Static Bending Lamp Output: Circuit Short To Ground	A continuous memory and on-demand DTC that sets when the LDCMB detects a short to ground from the LH cornering lamp LED output circuit.
LDCMB B1568:12	Right Front Static Bending Lamp Output: Circuit Short To Battery	A continuous memory and on-demand DTC that sets when the LDCMB detects a short to voltage from the LH cornering lamp LED output circuit.
LDCMB B1568:13	Right Front Static Bending Lamp Output: Circuit Open	A continuous memory and on-demand DTC that sets when the LDCMB detects an open from the LH cornering lamp LED output circuit.
LDCMB B1568:14	Right Front Static Bending Lamp Output: Circuit Short To Ground Or Open	A continuous memory and on-demand DTC that sets when the LDCMB detects an open or short to ground from the LH cornering lamp LED output circuit.
LDCMB B1568:16	Right Front Static Bending Lamp Output: Circuit Voltage Below Threshold	A continuous memory and on-demand DTC that sets when the LDCMB detects a low voltage from the LH cornering lamp LED output circuit.
LDCMB B1568:1E	Right Front Static Bending Lamp Output: Circuit Resistance Out Of Range	A continuous memory and on-demand DTC that sets when the LDCMB detects a resistance out of the calibrated range from the LH cornering lamp LED output circuit.
LDCMB B1568:4B	Right Front Static Bending Lamp Output: Over Temperature	A continuous memory and on-demand DTC that sets when the LDCMB detects a high temperature from the LH cornering lamp LED output circuit.
LDCMB B1A58:11	Right Headlamp Leveling Motor: Circuit Short To Ground	A continuous memory and on-demand DTC that sets when the LDCMB detects a short to ground from the RH headlamp internal leveling motor circuit.
LDCMB B1A58:13	Right Headlamp Leveling Motor: Circuit Open	A continuous memory and on-demand DTC that sets when the LDCMB detects an open from the RH headlamp internal leveling motor circuit.
LDCMB B1A58:16	Right Headlamp Leveling Motor: Circuit Voltage Below Threshold	A continuous memory and on-demand DTC that sets when the LDCMB detects a low voltage on the RH headlamp internal leveling motor circuit.
LDCMB B1A58:17	Right Headlamp Leveling Motor: Circuit Voltage Above Threshold	A continuous memory and on-demand DTC that sets when the LDCMB detects a high voltage on the RH headlamp internal leveling motor circuit.
LDCMB B1A58:4B	Right Headlamp Leveling Motor: Over Temperature	A continuous memory and on-demand DTC that sets when the LDCMB detects a high temperature RH headlamp internal leveling motor circuit driver.
LDCMB B1A58:87	Right Headlamp Leveling Motor: Missing Message	A continuous memory and on-demand DTC that sets when the LDCMB detects a message missing from the HCM over the CAN .
LDCMB B1A58:A2	Right Headlamp Leveling Motor: System Voltage Low	A continuous memory and on-demand DTC that sets when the LDCMB detects a low voltage on the RH headlamp internal leveling motor circuit.

Possible Sources

Headlamp assembly
LDCMA
LDCMB
HCM

Visual Inspection and Pre-checks

Inspect the headlamp for damage.

F1 CHECK THE PARKING LAMPS AND FRONT TURN SIGNAL LAMP OPERATION

Ignition ON.

Activate the hazard lamp function and observe the front turn signal lamps.

Place the headlamp switch in the AUTOLAMPS position.

Is the LH headlamp leveling, front parking lamps and turn signals all inoperative or is the RH headlamp leveling, front parking lamps and turn signals all inoperative?

Yes

VERIFY the BCMC (also known as the BJB ) fuse 100 (25A) ( LH headlamp) or fuse 101 (25A) ( RH headlamp) is OK. If OK, GO to F2 If not OK, REFER to the Wiring Diagrams manual to identify the possible causes of the circuit short.

GO to F4

F2 CHECK THE HEADLAMP MOUNTED LDCM (LIGHTING DRIVER CONTROL MODULE) VOLTAGE CIRCUIT FOR AN OPEN

Ignition OFF.

Disconnect: Suspect LH Headlamp C1758 or RH Headlamp C1759.

Ignition ON.

Measure:
Click to display connectors
LH Headlamp

Positive Lead Measurement / Action Negative Lead

C1758-1 Ground

Click to display connectors
RH Headlamp

Positive Lead Measurement / Action Negative Lead

C1759-1 Ground

Is the voltage greater than 11 volts?

Yes

GO to F3

No	REPAIR the circuit.

F3 CHECK THE HEADLAMP MOUNTED LDCM (LIGHTING DRIVER CONTROL MODULE) GROUND CIRCUITS FOR AN OPEN

Measure:
Click to display connectors
LH Headlamp

Positive Lead Measurement / Action Negative Lead

C1758-1 C1758-2

Click to display connectors
RH Headlamp

Positive Lead Measurement / Action Negative Lead

C1759-1 C1759-2

Is the voltage greater than 11 volts?

Yes

GO to F10

No	REPAIR the circuit.

F4 CHECK FOR HCM (HEADLAMP CONTROL MODULE) AND LDCMA (LIGHTING DRIVER CONTROL MODULE A) OR LDCMB (LIGHTING DRIVER CONTROL MODULE B) DIAGNOSTIC TROUBLE CODES (DTCS)

Using a diagnostic scan tool, perform the HCM and LDCMA ( LH headlamp) or LDCMB ( RH headlamp) self-test.

Is HCM , LDCMA or LDCMB Diagnostic Trouble Codes (DTCs) present?

Yes

For LDCMA DTC B1566:4B or B1A57:4B or LDCMB DTC B1568:4B or B1A58:4B, GO to F5
For all other LDCMA or LDCMB headlamp leveling motor Diagnostic Trouble Codes (DTCs), GO to F8
For any other LDCMA or LDCMB Diagnostic Trouble Codes (DTCs) that are not headlamp leveling motor related, REFER to the Master DTC Chart (All-Inclusive).
For HCM DTC B1437:01 or B1439:01, GO to F10

GO to F8

F5 CHECK FOR LDCMA (LIGHTING DRIVER CONTROL MODULE A) OR LDCMB (LIGHTING DRIVER CONTROL MODULE B) DIAGNOSTIC TROUBLE CODES (DTCS) AFTER A COOL DOWN PERIOD

Place the headlamp switch in the OFF position.

Ignition OFF.

Allow the vehicles and headlamps to cool to room temperature.

Ignition ON.

Place the headlamp switch in the HEADLAMPS position.

Raise the front of the vehicle by the frame slightly, then lower the vehicle to it's normal height.

After the headlamps cool, using a diagnostic scan tool, perform the LDCMA ( LH headlamp) or LDCMB ( RH headlamp) self-test.

Is LDCMA DTC B1566:4B or B1A57:4B or LDCMB DTC B1568:4B or B1A58:4B present?

Yes

GO to F10

GO to F6

F6 RECHECK THE HEADLAMP LEVELING OPERATION

While observing the headlamps, raise the front of the vehicle by the frame slightly, then lower the vehicle to it's normal height.

Do the low beams adjust aiming correctly?

Yes

GO to F7

GO to F8

F7 CHECK THE VEHICLE HISTORY

Check the vehicle history for LDCMA DTC B1566:4B or B1A57:4B or LDCMB DTC B1568:4B or B1A58:4B.

Has the vehicle set the same DTC in the past?

Yes

GO to F8

No	INSPECT the front turn signal lamp, wiring, headlamp and LDCM for damage. REPAIR the wiring or REPLACE any damaged components. If not signs of damage are found, the system is operating correctly at this time.

F8 CHECK THE HEADLAMP MOUNTED LDCM (LIGHTING DRIVER CONTROL MODULE) VOLTAGE CIRCUITS FOR AN OPEN

Place the LH steering column multifunction switch in the LOW BEAM position.

Place the headlamp switch in the OFF position.

Ignition OFF.

Disconnect: Suspect LH Headlamp C1758 or RH Headlamp C1759.

Ignition ON.

Place the headlamp switch in the HEADLAMPS position.

Measure:
Click to display connectors
LH Headlamp

Positive Lead Measurement / Action Negative Lead

C1758-1 Ground

C1758-9 Ground

Click to display connectors
RH Headlamp

Positive Lead Measurement / Action Negative Lead

C1759-1 Ground

C1759-9 Ground

Is the voltage greater than 11 volts?

Yes

GO to F9

No	REPAIR the circuit.

F9 CHECK THE HEADLAMP MOUNTED LDCM (LIGHTING DRIVER CONTROL MODULE) GROUND CIRCUIT FOR AN OPEN

Measure:
Click to display connectors
LH Headlamp

Positive Lead Measurement / Action Negative Lead

C1758-1 C1758-2

C1758-1 C1758-10

Click to display connectors
RH Headlamp

Positive Lead Measurement / Action Negative Lead

C1759-1 C1759-2

C1759-1 C1759-10

Is the voltage greater than 11 volts?

Yes

GO to F10

No	REPAIR the circuit.

F10 CHECK THE HEADLAMP MOUNTED LDCM (LIGHTING DRIVER CONTROL MODULE) PROGRAMMING

Place the headlamp switch in the OFF positions.

Using a diagnostic scan tool, complete the PMI process for the LDCMA ( LH headlamp) or for the LDCMB ( RH headlamp) following the on-screen instructions.

Place the headlamp switch in the HEADLAMPS positions.

Raise the front of the vehicle by the frame slightly, then lower the vehicle to it's normal height.

REPEAT the LDCMA or LDCMB self-test.

Is the concern still present or does any Diagnostic Trouble Codes (DTCs) return?

Yes

GO to F11

No	The system is operating correctly at this time. The concern may was caused by the LDCM .

F11 CHECK THE HEADLAMP MOUNTED LDCM (LIGHTING DRIVER CONTROL MODULE)

Place the headlamp switch in the OFF positions.

Ignition OFF.

INSTALL a new LDCM on the suspect headlamp.
REFER to: Lighting Driver Control Module (417-01 Exterior Lighting, Removal and Installation).

Ignition ON.

Using a diagnostic scan tool, complete the PMI process for the LDCMA ( LH headlamp) or for the LDCMB ( RH headlamp) following the on-screen instructions.

Place the headlamp switch in the HEADLAMPS positions.

Raise the front of the vehicle by the frame slightly, then lower the vehicle to it's normal height.

REPEAT the LDCMA or LDCMB self-test.

Is the concern still present or does any Diagnostic Trouble Codes (DTCs) return?

Yes

REMOVE the known good LDCM control module. INSTALL a new headlamp assembly.
REFER to: Headlamp Assembly (417-01 Exterior Lighting, Removal and Installation).

No	The system is operating correctly at this time. The concern may was caused by the LDCM .

PINPOINT TEST G: B1041:54, C1A03:29, C1A05:29

Normal Operation and Fault Conditions

REFER to: Exterior Lighting (417-01 Exterior Lighting, Description and Operation).

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
HCM B1041:54	Levelling Control: Missing Calibration	A continuous memory and on-demand DTC that sets when the HCM detects no calibrated value for the leveling system.
HCM C1A03:29	Left Front Height Sensor: Signal Invalid	A continuous memory and on-demand DTC that sets when the HCM detects an invalid input from the left front height sensor.
HCM C1A05:29	Left Rear Height Sensor: Signal Invalid	A continuous memory and on-demand DTC that sets when the HCM detects an invalid input from the left rear height sensor.

Possible Sources

HCM programming
HCM
VDM
Vehicle height sensor

Visual Inspection and Pre-checks

Inspect the headlamp leveling sensors and linkage for damage.

G1 CHECK FOR VDM (VEHICLE DYNAMICS CONTROL MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)

Using a diagnostic scan tool, perform the VDM headlamp self-test.

Is VDM Diagnostic Trouble Codes (DTCs) present?

Yes

Diagnose the VDM Diagnostic Trouble Codes (DTCs) first.
REFER to: Vehicle Dynamic Suspension (204-05 Vehicle Dynamic Suspension, Diagnosis and Testing).

GO to G2

G2 CHECK THE HCM (HEADLAMP CONTROL MODULE) PROGRAMMING

Place the headlamp switch in the OFF positions.

Using a diagnostic scan tool, complete the PMI process for the HCM following the on-screen instructions.

Place the headlamp switch in the HEADLAMPS positions.

Raise the front of the vehicle by the frame slightly, then lower the vehicle to it's normal height.

REPEAT the HCM self-test.

Is the concern still present or does any Diagnostic Trouble Codes (DTCs) return?

Yes

GO to G3

No	The system is operating correctly at this time. The concern may was caused by the HCM programming.

G3 CALIBRATE THE RIDE HEIGHT

Using a diagnostic scan tool, complete the PMI process for the HCM following the on-screen instructions.

Using a diagnostic scan tool, carry out the Ride Height Calibration routine. Follow the scan tool directions.

Raise the front of the vehicle by the frame slightly, then lower the vehicle to it's normal height.

REPEAT the HCM self-test.

Is the concern still present or does any Diagnostic Trouble Codes (DTCs) return?

Yes

GO to G4

No	The system is operating correctly at this time. The concern may was caused by the HCM programming.

G4 CHECK FOR CORRECT HCM (HEADLAMP CONTROL MODULE) OPERATION

Disconnect and inspect the HCM and related in-line connectors.

Repair:
- corrosion (install new connector or terminals – clean module pins)
- damaged or bent pins – install new terminals/pins
- pushed-out pins – install new pins as necessary

Reconnect the HCM and related in-line connectors. Make sure it seats and latches correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new HCM .
REFER to: Headlamp Control Module (HCM) (417-01 Exterior Lighting, Removal and Installation).

No	The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST H: B14DB:01, B14DB:54, B14DC:01, B14DC:54, B1559:96, B155A:96

Normal Operation and Fault Conditions

REFER to: Exterior Lighting (417-01 Exterior Lighting, Description and Operation).

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
HCM B14DB:01	Left Headlamp Driver Control System: General Electrical Failure	A continuous memory and on-demand DTC that sets when the HCM receives a message from the top mounted headlamp LED control module on the LH headlamp LIN circuit that there is a failure of the headlamp driver control system.
HCM B14DB:54	Left Headlamp Driver Control System: Missing Calibration	A continuous memory and on-demand DTC that sets when the HCM receives a message from the top mounted headlamp LED control module on the LH headlamp LIN circuit that the headlamp driver control system is missing it's calibration.
HCM B14DC:01	Right Headlamp Driver Control System: General Electrical Failure	A continuous memory and on-demand DTC that sets when the HCM receives a message from the top mounted headlamp LED control module on the RH headlamp LIN circuit that there is a failure of the headlamp driver control system.
HCM B14DC:54	Right Headlamp Driver Control System: Missing Calibration	A continuous memory and on-demand DTC that sets when the HCM receives a message from the top mounted headlamp LED control module on the RH headlamp LIN circuit that the headlamp driver control system is missing it's calibration.
HCM B1559:96	Left Headlamp: Component Internal Failure	A continuous memory and on-demand DTC that sets when the HCM receives a message from the top mounted headlamp LED control module on the LH headlamp LIN circuit that there is a component failure inside the headlamp assembly.
HCM B155A:96	Right Headlamp: Component Internal Failure	A continuous memory and on-demand DTC that sets when the HCM receives a message from the top mounted headlamp LED control module on the RH headlamp LIN circuit that there is a component failure inside the headlamp assembly.

Possible Sources

Headlamp assembly
Top mounted headlamp LED control module
HCM

Visual Inspection and Pre-checks

Inspect the headlamp for damage.

H1 CHECK FOR LDCMA (LIGHTING DRIVER CONTROL MODULE A) OR LDCMB (LIGHTING DRIVER CONTROL MODULE B) DIAGNOSTIC TROUBLE CODES (DTCS)

Ignition ON.

Using a diagnostic scan tool, perform the LDCMA ( LH headlamp) or LDCMB ( RH headlamp) self-test.

Is LDCMA or LDCMB Diagnostic Trouble Codes (DTCs) present?

Yes

Diagnose the LDCMA or LDCMB Diagnostic Trouble Codes (DTCs) first. REFER to the Master DTC Chart (All-Inclusive).

GO to H2

H2 CHECK THE HCM (HEADLAMP CONTROL MODULE) PROGRAMMING

Using a diagnostic scan tool, complete the PMI process for the HCM following the on-screen instructions.

REPEAT the HCM self-test.

Does any Diagnostic Trouble Codes (DTCs) return?

Yes

GO to H3

No	The system is operating correctly at this time. The concern may was caused by the HCM programming.

H3 CHECK THE HEADLAMP MOUNTED LDCM (LIGHTING DRIVER CONTROL MODULE) PROGRAMMING

Using a diagnostic scan tool, complete the PMI process for the LDCMA ( LH headlamp) or for the LDCMB ( RH headlamp) following the on-screen instructions.

REPEAT the LDCMA or LDCMB self-test.

Does any Diagnostic Trouble Codes (DTCs) return?

Yes

GO to H4

No	The system is operating correctly at this time. The concern may was caused by the LDCM .

H4 CHECK THE HEADLAMP MOUNTED LDCM (LIGHTING DRIVER CONTROL MODULE)

Ignition OFF.

INSTALL a new LDCM on the suspect headlamp.
REFER to: Lighting Driver Control Module (417-01 Exterior Lighting, Removal and Installation).

Ignition ON.

Using a diagnostic scan tool, complete the PMI process for the LDCMA ( LH headlamp) or for the LDCMB ( RH headlamp) following the on-screen instructions.

REPEAT the HCM self-test.

Does any Diagnostic Trouble Codes (DTCs) return?

Yes

REMOVE the known good LDCM control module. INSTALL a new headlamp assembly.
REFER to: Headlamp Assembly (417-01 Exterior Lighting, Removal and Installation).

No	The system is operating correctly at this time. The concern may was caused by the LDCM .

PINPOINT TEST I: U2024:51, U2024:57, U2100:00, U2101:56, U2200:45, U3000:45, U3000:46

Normal Operation and Fault Conditions

REFER to: Exterior Lighting (417-01 Exterior Lighting, Description and Operation).

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
HCM U2024:51	Control Module Cal-Config Data: Not Programmed	A continuous memory DTC that sets due to no HCM configuration.
HCM U2024:57	Control Module Cal-Config Data: Invalid/Incompatible Software Component	A continuous memory DTC that sets due to incomplete or incorrect HCM configuration.
HCM U202B:61	In-Use Application Signing Key: Signal Calculation Failure	A continuous memory DTC that sets due to incomplete or incorrect HCM configuration.
HCM U202B:62	In-Use Application Signing Key: Signal Compare Failure	A continuous memory DTC that sets due to incomplete or incorrect HCM configuration.
HCM U2100:00	Initial Configuration Not Complete: No Sub Type Information	A continuous memory DTC that sets due to incomplete or incorrect HCM configuration.
HCM U2101:56	Control Module Configuration Incompatible: Invalid/Incompatible Configuration	A continuous memory DTC that sets due to incomplete or incorrect HCM configuration.
HCM U2200:45	Control Module Configuration Memory Corrupt: Program Memory Failure	A continuous memoryDTC that sets due to incomplete or incorrect HCM configuration.
HCM U3000:41	Control Module: General Checksum Failure	A continuous memoryDTC that sets due to incomplete or incorrect HCM configuration.
HCM U3000:45	Control Module: Program Memory Failure	A continuous memory DTC that sets due to incomplete or incorrect HCM configuration.
HCM U3000:46	Control Module: Calibration/Parameter Memory Failure	A continuous memory DTC that sets due to incomplete or incorrect HCM configuration.

Possible Sources

I1 CHECK THE HCM (HEADLAMP CONTROL MODULE) PROGRAMMING

Using a diagnostic scan tool, complete the PMI process for the HCM following the on-screen instructions.

REPEAT the HCM self-test.

Does any Diagnostic Trouble Codes (DTCs) return?

Yes

GO to I2

No	The system is operating correctly at this time. The concern may was caused by the HCM programming.

I2 CHECK FOR CORRECT HCM (HEADLAMP CONTROL MODULE) OPERATION

Disconnect and inspect the HCM and related in-line connectors.

Repair:
- corrosion (install new connector or terminals – clean module pins)
- damaged or bent pins – install new terminals/pins
- pushed-out pins – install new pins as necessary

Reconnect the HCM and related in-line connectors. Make sure it seats and latches correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new HCM .
REFER to: Headlamp Control Module (HCM) (417-01 Exterior Lighting, Removal and Installation).

No	The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST J: U0401:00, U0415:00, U0416:00, U0420:00, U0422:00, U0429:00, U0452:00, U053B:00

Normal Operation and Fault Conditions

REFER to: Exterior Lighting (417-01 Exterior Lighting, Description and Operation).

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
HCM U0401:00	Invalid Data Received from ECM/PCM A: No Sub Type Information	A continuous memory DTC that sets when the HCM receives invalid network data from the PCM .
HCM U0415:00	Invalid Data Received from Anti-Lock Brake System (ABS) Control Module 'A': No Sub Type Information	A continuous memory DTC that sets when the HCM receives invalid network data from the ABS module.
HCM U0416:00	Invalid Data Received From Vehicle Dynamics Control Module: No Sub Type Information	A continuous memory DTC that sets when the HCM receives invalid network data from the VDM .
HCM U0420:00	Invalid Data Received from Power Steering Control Module 'A': No Sub Type Information	A continuous memory DTC that sets when the HCM receives invalid network data from the PSCM .
HCM U0422:00	Invalid Data Received From Body Control Module: No Sub Type Information	A continuous memory DTC that sets when the HCM receives invalid network data from the BCM .
HCM U0429:00	Invalid Data Received From Steering Column Control Module: No Sub Type Information	A continuous memory DTC that sets when the HCM receives invalid network data from the SCCM .
HCM U0452:00	Invalid Data Received From Restraints Control Module: No Sub Type Information	A continuous memory DTC that sets when the HCM receives invalid network data from the RCM .
HCM U053B:00	Invalid Data Received From Image Processing Module A: No Sub Type Information	A continuous memory DTC that sets when the HCM receives invalid network data from the IPMA .

Possible Sources

J1 REPEAT THE ON-DEMAND SELF-TEST AND CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS)

For DTC U0401:00, Using a diagnostic scan tool, repeat the PCM module self-test.

For DTC U0415:00, Using a diagnostic scan tool, repeat the ABS module self-test.

For DTC U0416:00, Using a diagnostic scan tool, repeat the VDM module self-test.

For DTC U0420:00, Using a diagnostic scan tool, repeat the PSCM self-test.

For DTC U0422:00, Using a diagnostic scan tool, repeat the BCM self-test.

For DTC U0429:00, Using a diagnostic scan tool, repeat the SCCM self-test.

For DTC U0452:00, Using a diagnostic scan tool, repeat the RCM self-test.

For DTC U053B:00, Using a diagnostic scan tool, repeat the IPMA self-test.

Are any non-network Diagnostic Trouble Codes (DTCs) present?

Yes

REPAIR the non-HCM Diagnostic Trouble Codes (DTCs) first. REFER to the Master DTC Chart (All-Inclusive).

No	Diagnose all network Diagnostic Trouble Codes (DTCs). REFER to the Master DTC Chart (All-Inclusive).

PINPOINT TEST K: U3003:16

Refer to Wiring Diagrams Cell 85 for schematic and connector information.

Normal Operation and Fault Conditions

REFER to: Exterior Lighting (417-01 Exterior Lighting, Description and Operation).

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
HCM U3003:16	Battery Voltage: Circuit Voltage Below Threshold	A continuous memory and on-demand DTC that sets in the HCM if the HCM detects low battery voltage on the voltage supply input.

Possible Sources

Wiring, terminals or connectors
Battery concern
Charging system concern
HCM

K1 CARRY OUT THE HCM (HEADLAMP CONTROL MODULE) SELF-TEST

Ignition ON.

Using a diagnostic scan tool, clear the Diagnostic Trouble Codes (DTCs).

Wait 10 seconds.

Using a diagnostic scan tool, perform the HCM self-test.

Is DTC U3003:16 still present?

Yes

GO to K2

No	The system is operating correctly at this time. The DTC may have been set due to a previous low battery voltage condition.

K2 CHECK FOR CHARGING SYSTEM DIAGNOSTIC TROUBLE CODES (DTCS)

Using a diagnostic scan tool, retrieve all Continuous Memory Diagnostic Trouble Codes (CMDTCs).

Are any charging system Diagnostic Trouble Codes (DTCs) recorded?

Yes

Diagnose the PCM Diagnostic Trouble Codes (DTCs). REFER to the Master DTC Chart (All-Inclusive).

GO to K3

K3 CHECK THE BATTERY CONDITION AND STATE OF CHARGE

Check the battery condition and verify the battery is fully charged.
REFER to: Battery (414-01 Battery, Mounting and Cables, Diagnosis and Testing).

Is the battery OK and fully charged?

Yes

GO to K4

No	CHARGE or INSTALL a new battery. For charging a battery, REFER to: Battery Charging (414-01 Battery, Mounting and Cables, General Procedures). For installing a new battery. REFER to: Battery (414-01 Battery, Mounting and Cables, Removal and Installation).

K4 CHECK THE HCM (HEADLAMP CONTROL MODULE) VOLTAGE SUPPLY

Ignition OFF.

Disconnect: HCM C2129.

Ignition ON.

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

C2129-13 Ground

Is the voltage greater than 11 volts?

Yes

GO to K5

No	REPAIR the circuit in question for high resistance.

K5 CHECK THE HCM (HEADLAMP CONTROL MODULE) PROCESSOR GROUND

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

C2129-16 Ground

Is the resistance less than 3 ohms?

Yes

GO to K6

No	REPAIR the circuit for high resistance.

K6 CHECK FOR CORRECT HCM (HEADLAMP CONTROL MODULE) OPERATION

Disconnect and inspect the HCM connector.

Repair:
- corrosion (install new connector or terminals – clean module pins)
- damaged or bent pins – install new terminals/pins
- pushed-out pins – install new pins as necessary

Reconnect the HCM connector. Make sure it seats and latches correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new HCM .
REFER to: Headlamp Control Module (HCM) (417-01 Exterior Lighting, Removal and Installation).

No	The system is operating correctly at this time. The concern may have been caused by the module connection. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST L: U3003:17

Normal Operation and Fault Conditions

REFER to: Exterior Lighting (417-01 Exterior Lighting, Description and Operation).

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
HCM U3003:17	Battery Voltage: Circuit Voltage Above Threshold	A continuous memory and on-demand DTC that sets in the HCM if the HCM detects high battery voltage on the voltage supply input.

Possible Sources

Charging system concern
HCM

L1 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS) P0563 (PCM (POWERTRAIN CONTROL MODULE) ), U3003:17 OR U3006:17 SET IN OTHER MODULES

Ignition ON.

Using a diagnostic scan tool, retrieve the Continuous Memory Diagnostic Trouble Codes (CMDTCs) from all modules.

Is DTC U3003:17, U3006:17 or P0563 ( PCM ) set in more than one module?

Yes

Diagnose the PCM Diagnostic Trouble Codes (DTCs). REFER to the Master DTC Chart (All-Inclusive).

GO to L2

L2 CHECK THE BATTERY VOLTAGE

Turn off all interior/exterior lights and accessories.

Start and run the engine at approximately 2,000 RPM for 3 minutes while monitoring the battery voltage.

Does the battery voltage rise to 15.9 volts or higher?

Yes

Diagnose the charging system.
REFER to: Charging System - 3.5L EcoBoost (272kW/370PS) - System Operation and Component Description (414-00 Charging System - General Information, Description and Operation).

GO to L3

L3 RECHECK FOR DTC (DIAGNOSTIC TROUBLE CODE) U3003:17

Turn the engine off.

Ignition ON.

Using a diagnostic scan tool, perform the self-test.

Clear the Continuous Memory Diagnostic Trouble Codes (CMDTCs).

Carry out the HCM self-test.

Is DTC U3003:17 still present?

Yes

CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new HCM .
REFER to: Headlamp Control Module (HCM) (417-01 Exterior Lighting, Removal and Installation).

No	The system is operating normally at this time. The DTC may have been set previously during battery charging or while jump starting the vehicle.

PINPOINT TEST M: HEADLAMP MISSING MESSAGE FAULTS - MULTIPLE DIAGNOSTIC TROUBLE CODES (DTCS)

Refer to Wiring Diagrams Cell 85 for schematic and connector information.

Normal Operation and Fault Conditions

REFER to: Exterior Lighting (417-01 Exterior Lighting, Description and Operation).

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
HCM B1437:87	Left Levelling Actuator: Missing Message	A continuous memoryDTC that sets when the HCM does not receive a left levelling actuator message from the LDCMA on the CAN .
HCM B1439:87	Right Levelling Actuator: Missing Message	A continuous memory DTC that sets when the HCM does not receive a left levelling actuator message from the LDCMB on the CAN .
HCM B14DB:87	Left Headlamp Driver Control System: Missing Message	A continuous memory DTC that sets when the HCM does not receive a headlamp driver control system message from the LED control module on the LH headlamp LIN circuit.
HCM B14DC:87	Right Headlamp Driver Control System: Missing Message	A continuous memory DTC that sets when the HCM does not receive a headlamp driver control system message from the LED control module on the RH headlamp LIN circuit.
LDCMA B123A:87	Left Front Turn Indicator: Missing Message	A continuous memory DTC that sets when the LDCMA detects a missing message from the HCM .
LDCMA B124B:87	Left Daytime Running Light: Missing Message	A continuous memory DTC that sets when the BCM detects a short to ground from the LH fog lamp output circuit.
LDCMA B149E:87	Left Front Position/Sidemarker: Missing Message	A continuous memory DTC that sets when the LDCMA detects a missing message from the HCM .
LDCMA B1566:87	Left Front Static Bending Lamp Output: Missing Message	A continuous memory DTC that sets when the LDCMA detects a missing message from the HCM .
LDCMA B1A57:87	Left Headlamp Leveling Motor: Missing Message	A continuous memory DTC that sets when the LDCMA detects a missing message from the HCM .
LDCMA B1D00:87	Left Low Beam: Missing Message	A continuous memory DTC that sets when the LDCMA detects a missing message from the HCM .
LDCMA U0241:00	Lost Communication With Headlamp Control Module 'A': No Sub Type Information	A continuous memory DTC that sets when the LDCMA detects a missing message from the HCM .
LDCMA U0542:00	Invalid Data Received From Headlamp Control Module 'A': No Sub Type Information	A continuous memory DTC that sets when the LDCMA detects a invalid message from the HCM .
LDCMA B1D02:87	Left High Beam Circuit: Missing Message	A continuous memory DTC that sets when the LDCMA detects a missing message from the HCM .
LDCMB B123B:87	Right Front Turn Indicator: Missing Message	A continuous memory DTC that sets when the LDCMB detects a missing message from the HCM .
LDCMB B124A:87	Right Daytime Running Light: Missing Message	A continuous memory DTC that sets when the BCM detects a short to ground from the LH fog lamp output circuit.
LDCMB B149F:87	Right Front Position/Sidemarker: Missing Message	A continuous memory DTC that sets when the LDCMB detects a missing message from the HCM .
LDCMB B1568:87	Right Front Static Bending Lamp Output: Missing Message	A continuous memory DTC that sets when the LDCMB detects a missing message from the HCM .
LDCMB B1A58:87	Right Headlamp Leveling Motor: Missing Message	A continuous memory DTC that sets when the LDCMB detects a missing message from the HCM .
LDCMB B1D01:87	Right Low Beam: Missing Message	A continuous memory DTC that sets when the LDCMB detects a missing message from the HCM .
LDCMB B1D03:87	Right High Beam Circuit: Missing Message	A continuous memory DTC that sets when the LDCMB detects a missing message from the HCM .
LDCMB U0242:00	Lost Communication With Headlamp Control Module 'B': No Sub Type Information	A continuous memory DTC that sets when the LDCMB detects a missing message from the HCM .
LDCMB U0543:00	Invalid Data Received From Headlamp Control Module 'B': No Sub Type Information	A continuous memory DTC that sets when the LDCMB detects a invalid message from the HCM .

Possible Sources

Wiring, terminals or connectors
Headlamp assembly
LDCMA ( LH headlamp)
LDCMB ( RH headlamp)
HCM

Visual Inspection and Pre-checks

Inspect the headlamp for damage.

M1 CHECK FOR HCM (HEADLAMP CONTROL MODULE) AND LDCMA (LIGHTING DRIVER CONTROL MODULE A) OR LDCMB (LIGHTING DRIVER CONTROL MODULE B) DIAGNOSTIC TROUBLE CODES (DTCS)

Using a diagnostic scan tool, perform the HCM and LDCMA ( LH headlamp) or LDCMB ( RH headlamp) self-test.

Are only the Trouble Codes (DTCs) listed in this pinpoint test present?

Yes

GO to M2

No	DIAGNOSE the Diagnostic Trouble Codes (DTCs) that are not missing message related first, REFER to the Master DTC Chart (All-Inclusive).

M2 CHECK THE HCM (HEADLAMP CONTROL MODULE) PROGRAMMING

Using a diagnostic scan tool, complete the PMI process for the HCM following the on-screen instructions.

REPEAT the HCM self-test.

Does any of the Diagnostic Trouble Codes (DTCs) return?

Yes

GO to M3

No	The system is operating correctly at this time. The concern may was caused by the HCM programming.

M3 CHECK THE HEADLAMP MOUNTED LDCM (LIGHTING DRIVER CONTROL MODULE) PROGRAMMING

Using a diagnostic scan tool, complete the PMI process for the LDCMA ( LH headlamp) or for the LDCMB ( RH headlamp) following the on-screen instructions.

REPEAT the LDCMA or LDCMB self-test.

Does any of the Diagnostic Trouble Codes (DTCs) return?

Yes

If LH headlamp and RH Diagnostic Trouble Codes (DTCs) are present, GO to M4
If only LH headlamp or only RH Diagnostic Trouble Codes (DTCs) are present, GO to M6

No	The system is operating correctly at this time. The concern may was caused by the LDCM .

M4 CHECK THE HEADLAMP CAN (CONTROLLER AREA NETWORK) CIRCUITS FOR A SHORT TO VOLTAGE

Ignition OFF.

Disconnect: LH Headlamp C1758.

Disconnect: RH Headlamp C1759.

Disconnect: HCM C2129.

Ignition ON.

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

C2129-5 Ground

C2129-17 Ground

Is any voltage present?

Yes

REPAIR the circuit.

GO to M5

M5 CHECK THE INDIVIDUAL HEADLAMP CAN (CONTROLLER AREA NETWORK) CIRCUITS FOR A SHORT TO GROUND

Ignition OFF.

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

C2129-5 Ground

C2129-17 Ground

Is the resistance greater than 10,000 ohms?

Yes

GO to M6

No	REPAIR the circuit.

M6 CHECK THE HEADLAMP CAN (CONTROLLER AREA NETWORK) CIRCUITS FOR AN OPEN

Ignition OFF.

Disconnect: For LH headlamp only Diagnostic Trouble Codes (DTCs) set, LH Headlamp C1758 (if not previously disconnected).

Disconnect: For RH headlamp only Diagnostic Trouble Codes (DTCs) set, RH Headlamp C1759 (if not previously disconnected).

Disconnect: HCM C2129 (if not previously disconnected).

For LH headlamp only Diagnostic Trouble Codes (DTCs) set, measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

C1758-11 C2129-5

C1758-12 C2129-17

For RH headlamp only Diagnostic Trouble Codes (DTCs) set, measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

C1759-11 C2129-5

C1759-12 C2129-17

For both LH headlamp and RH headlamp Diagnostic Trouble Codes (DTCs) set at the same time, measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

C1758-11 C2129-5

C1758-12 C2129-17

Is the resistance less than 3 ohms?

Yes

GO to M7

No	REPAIR the circuit in question.

M7 CHECK THE HEADLAMP MOUNTED LDCM (LIGHTING DRIVER CONTROL MODULE)

Ignition OFF.

INSTALL a new LDCM on the suspect headlamp.
REFER to: Lighting Driver Control Module (417-01 Exterior Lighting, Removal and Installation).

Ignition ON.

Using a diagnostic scan tool, complete the PMI process for the LDCMA ( LH headlamp) or for the LDCMB ( RH headlamp) following the on-screen instructions.

REPEAT the HCM self-test.

Does any Diagnostic Trouble Codes (DTCs) return?

Yes

REMOVE the known good LDCM control module. INSTALL a new headlamp assembly.
REFER to: Headlamp Assembly (417-01 Exterior Lighting, Removal and Installation).

No	The system is operating correctly at this time. The concern may was caused by the LDCM .

PINPOINT TEST N: U0100:87

Normal Operation and Fault Conditions

REFER to: Exterior Lighting (417-01 Exterior Lighting, Description and Operation).

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
HCM Continuous U0100:87	Lost Communication With ECM/PCM 'A': Missing Message	A continuous memory DTC that sets in continuous memory in the HCM if data messages received from the PCM are missing for 5 seconds or longer.

Possible Sources

Communication concern
Battery voltage concern
PCM
HCM

N1 VERIFY THE SCAN TOOL COMMUNICATES WITH THE PCM (POWERTRAIN CONTROL MODULE)

Ignition ON.

Connect the scan tool.

Using the diagnostic scan tool, verify that a vehicle session can be established.

Can a vehicle session be established?

Yes

GO to N2

No	REFER to: Controller Area Network (CAN) Module Communications Network (418-00A Controller Area Network (CAN) Module Communications Network, Diagnosis and Testing).

N2 CHECK THE HEADLAMP HCM (HEADLAMP CONTROL MODULE) CONTINUOUS MEMORY DIAGNOSTIC TROUBLE CODES (CMDTCS)

Using a diagnostic scan tool, perform the HCM self-test.

Clear the Diagnostic Trouble Codes (DTCs).

Wait 10 seconds.

Repeat the TRM self-test.

Is DTC U0100:87 set again?

Yes

GO to N3

No	The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

N3 PERFORM THE PCM (POWERTRAIN CONTROL MODULE) SELF-TEST

Using a diagnostic scan tool, perform the PCM KOEO and KOER self-test.

Are any PCM Diagnostic Trouble Codes (DTCs) recorded?

Yes

Diagnose the PCM Diagnostic Trouble Codes (DTCs). REFER to the Master DTC Chart.

GO to N4

N4 CHECK FOR DTC (DIAGNOSTIC TROUBLE CODE) U0100:87

Using a diagnostic scan tool, clear all Diagnostic Trouble Codes (DTCs).

Ignition OFF.

Ignition ON.

Wait 10 seconds.

Using a diagnostic scan tool, perform the continuous memory self-test.

Retrieve the Continuous Memory Diagnostic Trouble Codes (CMDTCs) from all modules.

Is DTC U0100:87 set in any other module?

Yes

Click here to access Guided Routine (PCM).

GO to N5

N5 CHECK THE HCM (HEADLAMP CONTROL MODULE) PROGRAMMING

Using a diagnostic scan tool, complete the PMI process for the HCM following the on-screen instructions.

REPEAT the HCM self-test.

Does any Diagnostic Trouble Codes (DTCs) return?

Yes

GO to N6

No	The system is operating correctly at this time. The concern may was caused by the HCM programming.

N6 CHECK FOR CORRECT HCM (HEADLAMP CONTROL MODULE) OPERATION

Disconnect and inspect the HCM and related in-line connectors.

Repair:
- corrosion (install new connector or terminals – clean module pins)
- damaged or bent pins – install new terminals/pins
- pushed-out pins – install new pins as necessary

Reconnect the HCM and related in-line connectors. Make sure it seats and latches correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new HCM .
REFER to: Headlamp Control Module (HCM) (417-01 Exterior Lighting, Removal and Installation).

No	The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST O: U0121:87

Normal Operation and Fault Conditions

REFER to: Exterior Lighting (417-01 Exterior Lighting, Description and Operation).

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
HCM Continuous U0121:87	Lost Communication With Anti-Lock Brake System (ABS) Control Module 'A': Missing Message	A continuous memory DTC that sets in continuous memory if the HCM does not receive data messages from the ABS module through the GWM are missing for 5 seconds or longer.

Possible Sources

Communication concern
Battery voltage concern
ABS module
HCM

O1 VERIFY THE CUSTOMER CONCERN

Ignition ON.

Verify there is an observable symptom present.

Is an observable symptom present?

Yes

GO to O2

No	The system is operating normally at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

O2 CHECK THE COMMUNICATION NETWORK

Using a diagnostic scan tool, perform the network test.

Does the ABS module pass the network test?

Yes

GO to O3

No	REFER to: Controller Area Network (CAN) Module Communications Network (418-00A Controller Area Network (CAN) Module Communications Network, Diagnosis and Testing).

O3 PERFORM THE ABS (ANTI-LOCK BRAKE SYSTEM) MODULE SELF-TEST

Using a diagnostic scan tool, perform the ABS module self-test.

Are any Diagnostic Trouble Codes (DTCs) recorded?

Yes

Diagnose the ABS Diagnostic Trouble Codes (DTCs). REFER to the Master DTC Chart (All-Inclusive).

GO to O4

O4 RECHECK THE HCM (HEADLAMP CONTROL MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)

NOTE: If new modules were installed prior to the DTC being set, the module configuration may be incorrectly set during the PMI , or the PMI may not have been carried out.

Using a diagnostic scan tool, clear the Diagnostic Trouble Codes (DTCs).

Wait 10 seconds.

Repeat the HCM self-test.

Is DTC U0121:87 still present?

Yes

GO to O5

No	The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

O5 CHECK FOR DTC (DIAGNOSTIC TROUBLE CODE) U0121:87 SET IN OTHER MODULES

Using a diagnostic scan tool, clear all Diagnostic Trouble Codes (DTCs).

Ignition OFF.

Ignition ON.

Wait 10 seconds.

Using a diagnostic scan tool, perform the continuous memory self-test.

Retrieve the Continuous Memory Diagnostic Trouble Codes (CMDTCs) from all modules.

Is DTC U0121:87 set in the BCM ?

Yes

INSTALL a new EBB unit ( HCU and ABS module assembly).

GO to O6

O6 CHECK THE HCM (HEADLAMP CONTROL MODULE) PROGRAMMING

Using a diagnostic scan tool, complete the PMI process for the HCM following the on-screen instructions.

REPEAT the HCM self-test.

Does any Diagnostic Trouble Codes (DTCs) return?

Yes

GO to O7

No	The system is operating correctly at this time. The concern may was caused by the HCM programming.

O7 CHECK FOR CORRECT HCM (HEADLAMP CONTROL MODULE) OPERATION

Disconnect and inspect the HCM and related in-line connectors.

Repair:
- corrosion (install new connector or terminals – clean module pins)
- damaged or bent pins – install new terminals/pins
- pushed-out pins – install new pins as necessary

Reconnect the HCM and related in-line connectors. Make sure it seats and latches correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new HCM .
REFER to: Headlamp Control Module (HCM) (417-01 Exterior Lighting, Removal and Installation).

No	The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST P: U0122:87

Normal Operation and Fault Conditions

REFER to: Exterior Lighting (417-01 Exterior Lighting, Description and Operation).

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
HCM Continuous U0122:87	Lost Communication With Vehicle Dynamics Control Module: Missing Message	A continuous memory DTC that sets in continuous memory if the HCM does not receive data messages from the VDM are missing for 5 seconds or longer.

Possible Sources

Communication concern
Battery voltage concern
VDM module
HCM

P1 VERIFY THE CUSTOMER CONCERN

Ignition ON.

Verify there is an observable symptom present.

Is an observable symptom present?

Yes

GO to P2

No	The system is operating normally at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

P2 CHECK THE COMMUNICATION NETWORK

Using a diagnostic scan tool, perform the network test.

Does the VDM pass the network test?

Yes

GO to P3

No	REFER to: Controller Area Network (CAN) Module Communications Network (418-00A Controller Area Network (CAN) Module Communications Network, Diagnosis and Testing).

P3 PERFORM THE VDM (VEHICLE DYNAMICS CONTROL MODULE) MODULE SELF-TEST

Using a diagnostic scan tool, perform the VDM self-test.

Are any Diagnostic Trouble Codes (DTCs) recorded?

Yes

Diagnose the VDM Diagnostic Trouble Codes (DTCs). REFER to the Master DTC Chart (All-Inclusive).

GO to P4

P4 RECHECK THE HCM (HEADLAMP CONTROL MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)

NOTE: If new modules were installed prior to the DTC being set, the module configuration may be incorrectly set during the PMI , or the PMI may not have been carried out.

Using a diagnostic scan tool, clear the Diagnostic Trouble Codes (DTCs).

Wait 10 seconds.

Repeat the HCM self-test.

Is DTC U0122:87 still present?

Yes

GO to P5

No	The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

P5 CHECK FOR DTC (DIAGNOSTIC TROUBLE CODE) U0122:87 SET IN OTHER MODULES

Using a diagnostic scan tool, clear all Diagnostic Trouble Codes (DTCs).

Ignition OFF.

Ignition ON.

Wait 10 seconds.

Using a diagnostic scan tool, perform the continuous memory self-test.

Retrieve the Continuous Memory Diagnostic Trouble Codes (CMDTCs) from all modules.

Is DTC U0121:87 set in the BCM ?

Yes

INSTALL a newVDM .
REFER to: Vehicle Dynamics Control Module (VDM) (204-05 Vehicle Dynamic Suspension, Removal and Installation).

GO to P6

P6 CHECK THE HCM (HEADLAMP CONTROL MODULE) PROGRAMMING

Using a diagnostic scan tool, complete the PMI process for the HCM following the on-screen instructions.

REPEAT the HCM self-test.

Does any Diagnostic Trouble Codes (DTCs) return?

Yes

GO to P7

No	The system is operating correctly at this time. The concern may was caused by the HCM programming.

P7 CHECK FOR CORRECT HCM (HEADLAMP CONTROL MODULE) OPERATION

Disconnect and inspect the HCM and related in-line connectors.

Repair:
- corrosion (install new connector or terminals – clean module pins)
- damaged or bent pins – install new terminals/pins
- pushed-out pins – install new pins as necessary

Reconnect the HCM and related in-line connectors. Make sure it seats and latches correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new HCM .
REFER to: Headlamp Control Module (HCM) (417-01 Exterior Lighting, Removal and Installation).

No	The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST Q: U0131:87

Normal Operation and Fault Conditions

REFER to: Exterior Lighting (417-01 Exterior Lighting, Description and Operation).

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
HCM Continuous U0131:87	Lost Communication With Power Steering Control Module 'A': Missing Message	A continuous memory DTC that sets in continuous memory if the HCM does not receive data messages from the PSCM module are missing for 5 seconds or longer.

Possible Sources

Communication concern
Battery voltage concern
PSCM
HCM

Q1 VERIFY THE CUSTOMER CONCERN

Ignition ON.

Verify there is an observable symptom present.

Is an observable symptom present?

Yes

GO to Q2

No	The system is operating normally at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

Q2 CHECK THE COMMUNICATION NETWORK

Using a diagnostic scan tool, perform the network test.

Does the PSCM pass the network test?

Yes

GO to Q3

No	REFER to: Controller Area Network (CAN) Module Communications Network (418-00A Controller Area Network (CAN) Module Communications Network, Diagnosis and Testing).

Q3 PERFORM THE PSCM (POWER STEERING CONTROL MODULE) SELF-TEST

Using a diagnostic scan tool, perform the PSCM self-test.

Are any Diagnostic Trouble Codes (DTCs) recorded?

Yes

Diagnose the PSCM Diagnostic Trouble Codes (DTCs). REFER to the Master DTC Chart (All-Inclusive).

GO to Q4

Q4 RECHECK THE HCM (HEADLAMP CONTROL MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)

NOTE: If new modules were installed prior to the DTC being set, the module configuration may be incorrectly set during the PMI , or the PMI may not have been carried out.

Using a diagnostic scan tool, clear the Diagnostic Trouble Codes (DTCs).

Wait 10 seconds.

Repeat the HCM self-test.

Is DTC U0131:87 still present?

Yes

GO to Q5

No	The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

Q5 CHECK FOR DTC (DIAGNOSTIC TROUBLE CODE) U0131:87 SET IN OTHER MODULES

Using a diagnostic scan tool, clear all Diagnostic Trouble Codes (DTCs).

Ignition OFF.

Ignition ON.

Wait 10 seconds.

Using a diagnostic scan tool, perform the continuous memory self-test.

Retrieve the Continuous Memory Diagnostic Trouble Codes (CMDTCs) from all modules.

Is DTC U0131:87 set in the BCM ?

Yes

INSTALL a new PSCM (part of the steering gear).
REFER to: Steering Gear (211-02 Power Steering, Removal and Installation).

GO to Q6

Q6 CHECK THE HCM (HEADLAMP CONTROL MODULE) PROGRAMMING

Using a diagnostic scan tool, complete the PMI process for the HCM following the on-screen instructions.

REPEAT the HCM self-test.

Does any Diagnostic Trouble Codes (DTCs) return?

Yes

GO to Q7

No	The system is operating correctly at this time. The concern may was caused by the HCM programming.

Q7 CHECK FOR CORRECT HCM (HEADLAMP CONTROL MODULE) OPERATION

Disconnect and inspect the HCM and related in-line connectors.

Repair:
- corrosion (install new connector or terminals – clean module pins)
- damaged or bent pins – install new terminals/pins
- pushed-out pins – install new pins as necessary

Reconnect the HCM and related in-line connectors. Make sure it seats and latches correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new HCM .
REFER to: Headlamp Control Module (HCM) (417-01 Exterior Lighting, Removal and Installation).

No	The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST R: U0140:87

Normal Operation and Fault Conditions

REFER to: Exterior Lighting (417-01 Exterior Lighting, Description and Operation).

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
HCM Continuous U0140:87	Lost Communication With Body Control Module: Missing Message	A continuous memory DTC that sets when the HCM if messages received from the BCM are missing.

Possible Sources

Communication concern
BCM
HCM

R1 VERIFY THE CUSTOMER CONCERN

Ignition ON.

Verify that there is an observable symptom present.

Is an observable symptom present?

Yes

GO to R2

No	The system is operating normally at this time. The DTC may have been set due to high network traffic or an intermittent fault condition. CLEAR the DTC .

R2 CHECK THE COMMUNICATION NETWORK

Using a diagnostic scan tool, perform a network test.

Does the HCM pass the network test?

Yes

GO to R3

No	REFER to: Controller Area Network (CAN) Module Communications Network (418-00A Controller Area Network (CAN) Module Communications Network, Diagnosis and Testing).

R3 RETRIEVE THE BCM (BODY CONTROL MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)

Using a diagnostic scan tool, perform the BCM self-test.

Are any BCM Diagnostic Trouble Codes (DTCs) recorded?

Yes

Diagnose the BCM Diagnostic Trouble Codes (DTCs). REFER to the Master DTC Chart (All-Inclusive).

GO to R4

R4 RECHECK THE HCM (HEADLAMP CONTROL MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)

Using a diagnostic scan tool, clear the HCM Diagnostic Trouble Codes (DTCs).

Wait 10 seconds.

Ignition OFF.

Ignition ON.

Using a diagnostic scan tool, perform the HCM self-test.

Is DTC U0140:87 still present?

Yes

GO to R5

No	The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

R5 CHECK FOR DTC (DIAGNOSTIC TROUBLE CODE) U0140:87 SET IN OTHER MODULES

Using a diagnostic scan tool, clear all Diagnostic Trouble Codes (DTCs).

Ignition OFF.

Ignition ON.

Using a diagnostic scan tool, perform the self-test.

Retrieve the Diagnostic Trouble Codes (DTCs) from all modules.

Is DTC U0140:87 set in any other module?

Yes

GO to R6

GO to R7

R6 CHECK FOR CORRECT BCM (BODY CONTROL MODULE) OPERATION

Disconnect and inspect all BCM connectors.

Repair:
- corrosion (install new connector or terminals – clean module pins)
- damaged or bent pins – install new terminals/pins
- pushed-out pins – install new pins as necessary

Reconnect the BCM connectors. Make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

No	The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.

R7 CHECK THE HCM (HEADLAMP CONTROL MODULE) PROGRAMMING

Using a diagnostic scan tool, complete the PMI process for the HCM following the on-screen instructions.

REPEAT the HCM self-test.

Does any Diagnostic Trouble Codes (DTCs) return?

Yes

GO to R8

No	The system is operating correctly at this time. The concern may was caused by the HCM programming.

R8 CHECK FOR CORRECT HCM (HEADLAMP CONTROL MODULE) OPERATION

Disconnect and inspect the HCM and related in-line connectors.

Repair:
- corrosion (install new connector or terminals – clean module pins)
- damaged or bent pins – install new terminals/pins
- pushed-out pins – install new pins as necessary

Reconnect the HCM and related in-line connectors. Make sure it seats and latches correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new HCM .
REFER to: Headlamp Control Module (HCM) (417-01 Exterior Lighting, Removal and Installation).

No	The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST S: U0151:87

Normal Operation and Fault Conditions

REFER to: Exterior Lighting (417-01 Exterior Lighting, Description and Operation).

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
HCM Continuous U0151:87	Lost Communication With Restraints Control Module: Missing Message	A continuous memory DTC that sets when the HCM if messages received from the RCM are missing.

Possible Sources

Communication concern
RCM
HCM

S1 VERIFY THE CUSTOMER CONCERN

Ignition ON.

Verify that there is an observable symptom present.

Is an observable symptom present?

Yes

GO to S2

No	The system is operating normally at this time. The DTC may have been set due to high network traffic or an intermittent fault condition. CLEAR the DTC .

S2 CHECK THE COMMUNICATION NETWORK

Using a diagnostic scan tool, perform a network test.

Does the HCM pass the network test?

Yes

GO to S3

No	REFER to: Controller Area Network (CAN) Module Communications Network (418-00A Controller Area Network (CAN) Module Communications Network, Diagnosis and Testing).

S3 RETRIEVE THE RCM (RESTRAINTS CONTROL MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)

Using a diagnostic scan tool, perform the RCM self-test.

Are any RCM Diagnostic Trouble Codes (DTCs) recorded?

Yes

Diagnose the RCM Diagnostic Trouble Codes (DTCs). REFER to the Master DTC Chart (All-Inclusive).

GO to S4

S4 RECHECK THE HCM (HEADLAMP CONTROL MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)

Using a diagnostic scan tool, clear the HCM Diagnostic Trouble Codes (DTCs).

Wait 10 seconds.

Ignition OFF.

Ignition ON.

Using a diagnostic scan tool, perform the HCM self-test.

Is DTC U0151:87 still present?

Yes

GO to S5

No	The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

S5 CHECK FOR DTC (DIAGNOSTIC TROUBLE CODE) U0151:87 SET IN OTHER MODULES

Using a diagnostic scan tool, clear all Diagnostic Trouble Codes (DTCs).

Ignition OFF.

Ignition ON.

Using a diagnostic scan tool, perform the self-test.

Retrieve the Diagnostic Trouble Codes (DTCs) from all modules.

Is DTC U0151:87 set in any other module?

Yes

INSTALL a new RCM .
REFER to: Restraints Control Module (RCM) (501-20B Supplemental Restraint System, Removal and Installation).

GO to S6

S6 CHECK THE HCM (HEADLAMP CONTROL MODULE) PROGRAMMING

Using a diagnostic scan tool, complete the PMI process for the HCM following the on-screen instructions.

REPEAT the HCM self-test.

Does any Diagnostic Trouble Codes (DTCs) return?

Yes

GO to S7

No	The system is operating correctly at this time. The concern may was caused by the HCM programming.

S7 CHECK FOR CORRECT HCM (HEADLAMP CONTROL MODULE) OPERATION

Disconnect and inspect the HCM and related in-line connectors.

Repair:
- corrosion (install new connector or terminals – clean module pins)
- damaged or bent pins – install new terminals/pins
- pushed-out pins – install new pins as necessary

Reconnect the HCM and related in-line connectors. Make sure it seats and latches correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new HCM .
REFER to: Headlamp Control Module (HCM) (417-01 Exterior Lighting, Removal and Installation).

No	The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST T: U0212:87

Normal Operation and Fault Conditions

REFER to: Exterior Lighting (417-01 Exterior Lighting, Description and Operation).

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
HCM Continuous U0212:87	Lost Communication With Steering Column Control Module: Missing Message	A continuous memory DTC that sets when the HCM if messages received from the SCCM are missing.

Possible Sources

Communication concern
SCCM
HCM

T1 VERIFY THE CUSTOMER CONCERN

Ignition ON.

Verify that there is an observable symptom present.

Is an observable symptom present?

Yes

GO to T2

No	The system is operating normally at this time. The DTC may have been set due to high network traffic or an intermittent fault condition. CLEAR the DTC .

T2 CHECK THE COMMUNICATION NETWORK

Using a diagnostic scan tool, perform a network test.

Does the HCM pass the network test?

Yes

GO to T3

No	REFER to: Controller Area Network (CAN) Module Communications Network (418-00A Controller Area Network (CAN) Module Communications Network, Diagnosis and Testing).

T3 RETRIEVE THE SCCM (STEERING COLUMN CONTROL MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)

Using a diagnostic scan tool, perform the SCCM self-test.

Are any SCCM Diagnostic Trouble Codes (DTCs) recorded?

Yes

Diagnose the SCCM Diagnostic Trouble Codes (DTCs). REFER to the Master DTC Chart (All-Inclusive).

GO to T4

T4 RECHECK THE HCM (HEADLAMP CONTROL MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)

Using a diagnostic scan tool, clear the HCM Diagnostic Trouble Codes (DTCs).

Wait 10 seconds.

Ignition OFF.

Ignition ON.

Using a diagnostic scan tool, perform the HCM self-test.

Is DTC U0212:87 still present?

Yes

GO to T5

No	The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

T5 CHECK FOR DTC (DIAGNOSTIC TROUBLE CODE) U0212:87 SET IN OTHER MODULES

Using a diagnostic scan tool, clear all Diagnostic Trouble Codes (DTCs).

Ignition OFF.

Ignition ON.

Using a diagnostic scan tool, perform the self-test.

Retrieve the Diagnostic Trouble Codes (DTCs) from all modules.

Is DTC U0212:87 set in any other module?

Yes

INSTALL a new SCCM .
REFER to: Steering Column Control Module (SCCM) (211-05 Steering Wheel and Column Electrical Components, Removal and Installation).

GO to T6

T6 CHECK THE HCM (HEADLAMP CONTROL MODULE) PROGRAMMING

Using a diagnostic scan tool, complete the PMI process for the HCM following the on-screen instructions.

REPEAT the HCM self-test.

Does any Diagnostic Trouble Codes (DTCs) return?

Yes

GO to T7

No	The system is operating correctly at this time. The concern may was caused by the HCM programming.

T7 CHECK FOR CORRECT HCM (HEADLAMP CONTROL MODULE) OPERATION

Disconnect and inspect the HCM and related in-line connectors.

Repair:
- corrosion (install new connector or terminals – clean module pins)
- damaged or bent pins – install new terminals/pins
- pushed-out pins – install new pins as necessary

Reconnect the HCM and related in-line connectors. Make sure it seats and latches correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new HCM .
REFER to: Headlamp Control Module (HCM) (417-01 Exterior Lighting, Removal and Installation).

No	The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST U: U023A:87

Normal Operation and Fault Conditions

REFER to: Exterior Lighting (417-01 Exterior Lighting, Description and Operation).

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
HCM Continuous U023A:87	Lost Communication With Image Processing Module A: Missing Message	A continuous memory DTC that sets when the HCM if messages received from the IPMA are missing.

Possible Sources

Communication concern
IPMA
HCM

U1 VERIFY THE CUSTOMER CONCERN

Ignition ON.

Verify that there is an observable symptom present.

Is an observable symptom present?

Yes

GO to U2

No	The system is operating normally at this time. The DTC may have been set due to high network traffic or an intermittent fault condition. CLEAR the DTC .

U2 CHECK THE COMMUNICATION NETWORK

Using a diagnostic scan tool, perform a network test.

Does the HCM pass the network test?

Yes

GO to U3

No	REFER to: Controller Area Network (CAN) Module Communications Network (418-00A Controller Area Network (CAN) Module Communications Network, Diagnosis and Testing).

U3 RETRIEVE THE IPMA (IMAGE PROCESSING MODULE A) DIAGNOSTIC TROUBLE CODES (DTCS)

Using a diagnostic scan tool, perform the IPMA self-test.

Are any IPMA Diagnostic Trouble Codes (DTCs) recorded?

Yes

Diagnose the IPMA Diagnostic Trouble Codes (DTCs). REFER to the Master DTC Chart (All-Inclusive).

GO to U4

U4 RECHECK THE HCM (HEADLAMP CONTROL MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)

Using a diagnostic scan tool, clear the HCM Diagnostic Trouble Codes (DTCs).

Wait 10 seconds.

Ignition OFF.

Ignition ON.

Using a diagnostic scan tool, perform the HCM self-test.

Is DTC U023A:87 still present?

Yes

GO to U5

No	The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

U5 CHECK FOR DTC (DIAGNOSTIC TROUBLE CODE) U023A:87 SET IN OTHER MODULES

Using a diagnostic scan tool, clear all Diagnostic Trouble Codes (DTCs).

Ignition OFF.

Ignition ON.

Using a diagnostic scan tool, perform the self-test.

Retrieve the Diagnostic Trouble Codes (DTCs) from all modules.

Is DTC U023A:87 set in any other module?

Yes

INSTALL a new IPMA .
REFER to: Image Processing Module A (IPMA) (419-07 Lane Keeping System, Removal and Installation).

GO to U6

U6 CHECK THE HCM (HEADLAMP CONTROL MODULE) PROGRAMMING

Using a diagnostic scan tool, complete the PMI process for the HCM following the on-screen instructions.

REPEAT the HCM self-test.

Does any Diagnostic Trouble Codes (DTCs) return?

Yes

GO to U7

No	The system is operating correctly at this time. The concern may was caused by the HCM programming.

U7 CHECK FOR CORRECT HCM (HEADLAMP CONTROL MODULE) OPERATION

Disconnect and inspect the HCM and related in-line connectors.

Repair:
- corrosion (install new connector or terminals – clean module pins)
- damaged or bent pins – install new terminals/pins
- pushed-out pins – install new pins as necessary

Reconnect the HCM and related in-line connectors. Make sure it seats and latches correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new HCM .
REFER to: Headlamp Control Module (HCM) (417-01 Exterior Lighting, Removal and Installation).

No	The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST V: B14E5:56, B14E5:96, B14E7:56, B14E7:96, U0273:00, U0274:00, U3003:16, U3003:17, U3003:A2, U3003:A3

Normal Operation and Fault Conditions

REFER to: Exterior Lighting (417-01 Exterior Lighting, Description and Operation).

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
LDCMA B14E5:56	Left Front Enhanced Exterior Lighting System: Invalid/Incompatible Configuration	A continuous memory and on-demand DTC that sets when the LDCMA detects that the configuration is not correct.
LDCMA B14E5:96	Left Front Enhanced Exterior Lighting System: Component Internal Failure	A continuous memory and on-demand DTC that sets when the LDCMA detects an internal error.
LDCMA U0273:00	Lost Communication With Lighting Driver Control Module 'A': No Sub Type Information	A continuous memory and on-demand DTC that sets when the LDCMA lost communication with the LH headlamp internal LED controller.
LDCMA U3003:16	Battery Voltage: Circuit Voltage Below Threshold	A continuous memory and on-demand DTC that sets when the LDCMA detects voltage lower than 10 volts on the LDCMA voltage supply circuit.
LDCMA U3003:17	Battery Voltage: Circuit Voltage Above Threshold	A continuous memory and on-demand DTC that sets when the LDCMA detects voltage greater than 15.5 volts on the LDCMA voltage supply circuit.
LDCMA U3003:A2	Battery Voltage: System Voltage Low	A continuous memory and on-demand DTC that sets when the LDCMA detects voltage lower than 16 volts on the LDCMA voltage supply circuit.
LDCMA U3003:A3	Battery Voltage: System Voltage High	A continuous memory and on-demand DTC that sets when the LDCMA detects voltage greater than 20.5 volts on the LDCMA voltage supply circuit.
LDCMB B14E7:56	Right Front Enhanced Exterior Lighting System: Invalid/Incompatible Configuration	A continuous memory and on-demand DTC that sets when the LDCMB detects that the configuration is not correct.
LDCMB B14E7:96	Right Front Enhanced Exterior Lighting System: Component Internal Failure	A continuous memory and on-demand DTC that sets when the LDCMB detects an internal error.
LDCMB U0274:00	Lost Communication With Lighting Driver Control Module 'B': No Sub Type Information	A continuous memory and on-demand DTC that sets when the LDCMB lost communication with the LH headlamp internal LED controller.
LDCMB U3003:16	Battery Voltage: Circuit Voltage Below Threshold	A continuous memory and on-demand DTC that sets when the LDCMB detects voltage lower than 10 volts on the LDCMB voltage supply circuit.
LDCMB U3003:17	Battery Voltage: Circuit Voltage Above Threshold	A continuous memory and on-demand DTC that sets when the LDCMB detects voltage greater than 15.5 volts on the LDCMB voltage supply circuit.
LDCMB U3003:A2	Battery Voltage: System Voltage Low	A continuous memory and on-demand DTC that sets when the LDCMB detects voltage lower than 16 volts on the LDCMB voltage supply circuit.
LDCMB U3003:A3	Battery Voltage: System Voltage High	A continuous memory and on-demand DTC that sets when the LDCMB detects voltage greater than 20.5 volts on the LDCMB voltage supply circuit.

Possible Sources

Charging system
LDCMA
LDCMB

Visual Inspection and Pre-checks

Inspect the headlamp for damage.

V1 CHECK FOR ANY OTHER DIAGNOSTIC TROUBLE CODES (DTCS)

Using a diagnostic scan tool, retrieve all Continuous Memory Diagnostic Trouble Codes (CMDTCs).

Are any charging system Diagnostic Trouble Codes (DTCs) recorded?

Yes

Diagnose the other Diagnostic Trouble Codes (DTCs) first. REFER to the Master DTC Chart (All-Inclusive).

No	VERIFY the BCMC (also known as the BJB ) fuse 100 (25A) ( LH headlamp) or fuse 101 (25A) ( RH headlamp) is OK. If OK, GO to V2 If not OK, REFER to the Wiring Diagrams manual to identify the possible causes of the circuit short.

V2 CHECK THE HEADLAMP MOUNTED LDCM (LIGHTING DRIVER CONTROL MODULE) PROGRAMMING

Place the headlamp switch in the OFF positions.

Using a diagnostic scan tool, complete the PMI process for the LDCMA ( LH headlamp) or for the LDCMB ( RH headlamp) following the on-screen instructions.

Place the headlamp switch in the HEADLAMPS positions.

Raise the front of the vehicle by the frame slightly, then lower the vehicle to it's normal height.

REPEAT the LDCMA or LDCMB self-test.

Is the concern still present or does any Diagnostic Trouble Codes (DTCs) return?

Yes

GO to V3

No	The system is operating correctly at this time. The concern may was caused by the LDCM .

V3 CHECK THE HEADLAMP MOUNTED LDCM (LIGHTING DRIVER CONTROL MODULE)

Place the headlamp switch in the OFF positions.

Ignition OFF.

INSTALL a new LDCM on the suspect headlamp.
REFER to: Lighting Driver Control Module (417-01 Exterior Lighting, Removal and Installation).

Ignition ON.

Using a diagnostic scan tool, complete the PMI process for the LDCMA ( LH headlamp) or for the LDCMB ( RH headlamp) following the on-screen instructions.

Place the headlamp switch in the HEADLAMPS positions.

Raise the front of the vehicle by the frame slightly, then lower the vehicle to it's normal height.

REPEAT the LDCMA or LDCMB self-test.

Is the concern still present or does any Diagnostic Trouble Codes (DTCs) return?

Yes

REMOVE the known good LDCM control module. INSTALL a new headlamp assembly.
REFER to: Headlamp Assembly (417-01 Exterior Lighting, Removal and Installation).

No	The system is operating correctly at this time. The concern may was caused by the LDCM .

PINPOINT TEST W: U2100:00, U3000:45

Refer to Wiring Diagrams Cell 85 for schematic and connector information.

Normal Operation and Fault Conditions

REFER to: Exterior Lighting (417-01 Exterior Lighting, Description and Operation).

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
LDCMA U2100:00	Initial Configuration Not Complete: No Sub Type Information	A continuous memory and on-demand DTC that sets when the LDCMA detects that the initial configuration was not completed.
LDCMA U3000:45	Control Module: Program Memory Failure	A continuous memory and on-demand DTC that sets when the LDCMA detects an internal error.
LDCMA U2100:00	Initial Configuration Not Complete: No Sub Type Information	A continuous memory and on-demand DTC that sets when the LDCMB detects that the initial configuration was not completed.
LDCMA U3000:45	Control Module: Program Memory Failure	A continuous memory and on-demand DTC that sets when the LDCMB detects an internal error.

Possible Sources

LDCMA
LDCMB

W1 CHECK THE HEADLAMP MOUNTED LDCM (LIGHTING DRIVER CONTROL MODULE) PROGRAMMING

Place the headlamp switch in the OFF positions.

Using a diagnostic scan tool, complete the PMI process for the LDCMA ( LH headlamp) or for the LDCMB ( RH headlamp) following the on-screen instructions.

Place the headlamp switch in the HEADLAMPS positions.

Raise the front of the vehicle by the frame slightly, then lower the vehicle to it's normal height.

REPEAT the LDCMA or LDCMB self-test.

Is the concern still present or does any Diagnostic Trouble Codes (DTCs) return?

Yes

GO to W2

No	The system is operating correctly at this time. The concern may was caused by the LDCM .

W2 CHECK THE HEADLAMP MOUNTED LDCM (LIGHTING DRIVER CONTROL MODULE)

Place the headlamp switch in the OFF positions.

Ignition OFF.

INSTALL a new LDCM on the suspect headlamp.
REFER to: Lighting Driver Control Module (417-01 Exterior Lighting, Removal and Installation).

Ignition ON.

Using a diagnostic scan tool, complete the PMI process for the LDCMA ( LH headlamp) or for the LDCMB ( RH headlamp) following the on-screen instructions.

Place the headlamp switch in the HEADLAMPS positions.

Raise the front of the vehicle by the frame slightly, then lower the vehicle to it's normal height.

REPEAT the LDCMA or LDCMB self-test.

Is the concern still present or does any Diagnostic Trouble Codes (DTCs) return?

Yes

REMOVE the known good LDCM control module. INSTALL a new headlamp assembly.
REFER to: Headlamp Assembly (417-01 Exterior Lighting, Removal and Installation).

No	The system is operating correctly at this time. The concern may was caused by the LDCM .

W3 CHECK THE HEADLAMP MOUNTED LDCM (LIGHTING DRIVER CONTROL MODULE) GROUND CIRCUITS FOR AN OPEN

Measure:
Click to display connectors
LH Headlamp

Positive Lead Measurement / Action Negative Lead

C1758-1 C1758-2

Click to display connectors
RH Headlamp

Positive Lead Measurement / Action Negative Lead

C1759-1 C1759-2

Is the voltage greater than 11 volts?

Yes

GO to W10

No	REPAIR the circuit.

W4 CHECK FOR HCM (HEADLAMP CONTROL MODULE) AND LDCMA (LIGHTING DRIVER CONTROL MODULE A) OR LDCMB (LIGHTING DRIVER CONTROL MODULE B) DIAGNOSTIC TROUBLE CODES (DTCS)

Using a diagnostic scan tool, perform the HCM and LDCMA ( LH headlamp) or LDCMB ( RH headlamp) self-test.

Is HCM , LDCMA or LDCMB Diagnostic Trouble Codes (DTCs) present?

Yes

For LDCMA DTC B1A57:4B or LDCMB DTC B1A58:4B, GO to W5
For all other LDCMA or LDCMB headlamp leveling motor Diagnostic Trouble Codes (DTCs), GO to W8
For any other LDCMA or LDCMB Diagnostic Trouble Codes (DTCs) that are not headlamp leveling motor related, REFER to the Master DTC Chart (All-Inclusive).
For HCM DTC B1437:01 or B1439:01, GO to W10

GO to W8

W5 CHECK FOR LDCMA (LIGHTING DRIVER CONTROL MODULE A) OR LDCMB (LIGHTING DRIVER CONTROL MODULE B) DIAGNOSTIC TROUBLE CODES (DTCS) AFTER A COOL DOWN PERIOD

Place the headlamp switch in the OFF position.

Ignition OFF.

Allow the vehicles and headlamps to cool to room temperature.

Ignition ON.

Place the headlamp switch in the HEADLAMPS position.

Raise the front of the vehicle by the frame slightly, then lower the vehicle to it's normal height.

After the headlamps cool, using a diagnostic scan tool, perform the LDCMA ( LH headlamp) or LDCMB ( RH headlamp) self-test.

Is LDCMA DTC B1A57:4B or LDCMB DTC B1A58:4B present?

Yes

GO to W10

GO to W6

W6 RECHECK THE HEADLAMP LEVELING OPERATION

While observing the headlamps, raise the front of the vehicle by the frame slightly, then lower the vehicle to it's normal height.

Do the low beams adjust aiming correctly?

Yes

GO to W7

GO to W8

W7 CHECK THE VEHICLE HISTORY

Check the vehicle history for LDCMA DTC B1A57:4B or LDCMB DTC B1A58:4B.

Has the vehicle set the same DTC in the past?

Yes

GO to W8

No	INSPECT the front turn signal lamp, wiring, headlamp and LDCM for damage. REPAIR the wiring or REPLACE any damaged components. If not signs of damage are found, the system is operating correctly at this time.

W8 CHECK THE HEADLAMP MOUNTED LDCM (LIGHTING DRIVER CONTROL MODULE) VOLTAGE CIRCUITS FOR AN OPEN

Place the LH steering column multifunction switch in the LOW BEAM position.

Place the headlamp switch in the OFF position.

Ignition OFF.

Disconnect: Suspect LH Headlamp C1758 or RH Headlamp C1759.

Ignition ON.

Place the headlamp switch in the HEADLAMPS position.

Measure:
Click to display connectors
LH Headlamp

Positive Lead Measurement / Action Negative Lead

C1758-1 Ground

C1758-9 Ground

Click to display connectors
RH Headlamp

Positive Lead Measurement / Action Negative Lead

C1759-1 Ground

C1759-9 Ground

Is the voltage greater than 11 volts?

Yes

GO to W9

No	REPAIR the circuit.

W9 CHECK THE HEADLAMP MOUNTED LDCM (LIGHTING DRIVER CONTROL MODULE) GROUND CIRCUIT FOR AN OPEN

Measure:
Click to display connectors
LH Headlamp

Positive Lead Measurement / Action Negative Lead

C1758-1 C1758-2

C1758-1 C1758-10

Click to display connectors
RH Headlamp

Positive Lead Measurement / Action Negative Lead

C1759-1 C1759-2

C1759-1 C1759-10

Is the voltage greater than 11 volts?

Yes

GO to W10

No	REPAIR the circuit.

W10 CHECK THE HEADLAMP MOUNTED LDCM (LIGHTING DRIVER CONTROL MODULE) PROGRAMMING

Place the headlamp switch in the OFF positions.

Using a diagnostic scan tool, complete the PMI process for the LDCMA ( LH headlamp) or for the LDCMB ( RH headlamp) following the on-screen instructions.

Place the headlamp switch in the HEADLAMPS positions.

Raise the front of the vehicle by the frame slightly, then lower the vehicle to it's normal height.

REPEAT the LDCMA or LDCMB self-test.

Is the concern still present or does any Diagnostic Trouble Codes (DTCs) return?

Yes

GO to W11

No	The system is operating correctly at this time. The concern may was caused by the LDCM .

W11 CHECK THE HEADLAMP MOUNTED LDCM (LIGHTING DRIVER CONTROL MODULE)

Place the headlamp switch in the OFF positions.

Ignition OFF.

Reinstall the original headlamp assembly for the inoperative side of the vehicle.

INSTALL a new LDCM on the suspect headlamp.
REFER to: Lighting Driver Control Module (417-01 Exterior Lighting, Removal and Installation).

Ignition ON.

Using a diagnostic scan tool, complete the PMI process for the LDCMA ( LH headlamp) or for the LDCMB ( RH headlamp) following the on-screen instructions.

Place the headlamp switch in the HEADLAMPS positions.

Raise the front of the vehicle by the frame slightly, then lower the vehicle to it's normal height.

REPEAT the LDCMA or LDCMB self-test.

Is the concern still present or does any Diagnostic Trouble Codes (DTCs) return?

Yes

REMOVE the known good LDCM control module. INSTALL a new headlamp assembly.
REFER to: Headlamp Assembly (417-01 Exterior Lighting, Removal and Installation).

No	The system is operating correctly at this time. The concern may was caused by the LDCM .

Fog Lamps. Diagnosis and Testing

Diagnostic Trouble Code (DTC) Chart Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices. REFER to: Diagnostic Methods (100-00 General Information, Description and Operation)...

Parking, Rear and License Plate Lamps. Diagnosis and Testing

Materials

Name Specification Motorcraft® Premium Long-Life Grease
XG-1-E1 ESA-M1C75-B

Removal

With the vehicle in NEUTRAL, position the vehicle on a hoist.
Refer to: Jacking and Lifting (100-02 Jacking and Lifting, Description and Operation).
Remove the bolts and the transmission shield.

Lincoln Navigator: Exterior Lighting / Headlamps. Diagnosis and Testing

Fog Lamps. Diagnosis and Testing

Parking, Rear and License Plate Lamps. Diagnosis and Testing

Other information:

Lincoln Navigator 2018-2025 Workshop Manual: Second Row Single Seat Cushion Cover. Removal and Installation

Lincoln Navigator 2018-2025 Workshop Manual: Liftgate Latch Manual Release. General Procedures

Categories

Front Driveshaft. Removal and Installation