Lincoln Navigator Manuals

Lincoln Navigator: Exterior Lighting / Daytime Running Lamps (DRL). Diagnosis and Testing

Lincoln Navigator 2018-2025 Workshop Manual / Lighting / Exterior Lighting / Daytime Running Lamps (DRL). 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
LDCMA B124B:11 Left Daytime Running Light: Circuit Short To Ground GO to Pinpoint Test A
LDCMA B124B:12 Left Daytime Running Light: Circuit Short To Battery GO to Pinpoint Test A
LDCMA B124B:13 Left Daytime Running Light: Circuit Open GO to Pinpoint Test A
LDCMA B124B:14 Left Daytime Running Light: Circuit Short To Ground Or Open GO to Pinpoint Test A
LDCMA B124B:16 Left Daytime Running Light: Circuit Voltage Below Threshold GO to Pinpoint Test A
LDCMA B124B:1E Left Daytime Running Light: Circuit Resistance Out Of Range GO to Pinpoint Test A
LDCMA B124B:4B Left Daytime Running Light: Over Temperature GO to Pinpoint Test A
LDCMA B124B:87 Left Daytime Running Light: Missing Message GO to Pinpoint Test A
LDCMB B124A:11 Right Daytime Running Light: Circuit Short To Ground GO to Pinpoint Test A
LDCMB B124A:12 Right Daytime Running Light: Circuit Short To Battery GO to Pinpoint Test A
LDCMB B124A:13 Right Daytime Running Light: Circuit Open GO to Pinpoint Test A
LDCMB B124A:14 Right Daytime Running Light: Circuit Short To Ground Or Open GO to Pinpoint Test A
LDCMB B124A:16 Right Daytime Running Light: Circuit Voltage Below Threshold GO to Pinpoint Test A
LDCMB B124A:1E Right Daytime Running Light: Circuit Resistance Out Of Range GO to Pinpoint Test A
LDCMB B124A:4B Right Daytime Running Light: Over Temperature GO to Pinpoint Test A
LDCMB B124A:87 Right Daytime Running Light: Missing Message GO to Pinpoint Test A

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 > Daytime Running > Inoperative GO to Pinpoint Test A
Lighting/Glass/Vision > Exterior Lighting > Daytime Running > Stays On GO to Pinpoint Test A

Symptom Charts

Symptom Chart: DRL

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).


NOTE: Before beginning diagnostics, refer to Description and Operation in this section for proper DRL 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).
The DRL do not operate correctly   GO to Pinpoint Test A

Pinpoint Tests


PINPOINT TEST A: THE DRL (DAYTIME RUNNING LAMPS) DO 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
LDCMA B124B:11 Left Daytime Running Light: 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 daytime running/parking lamp circuit.
LDCMA B124B:12 Left Daytime Running Light: 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 daytime running/parking lamp circuit.
LDCMA B124B:13 Left Daytime Running Light: Circuit Open A continuous memory and on-demand DTC that sets when the LDCMA detects an open from the LH headlamp internal daytime running/parking lamp circuit.
LDCMA B124B:14 Left Daytime Running Light: 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 daytime running/parking lamp circuit.
LDCMA B124B:16 Left Daytime Running Light: 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 daytime running/parking lamp circuit.
LDCMA B124B:1E Left Daytime Running Light: 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 daytime running/parking lamp circuit.
LDCMA B124B:4B Left Daytime Running Light: Over Temperature A continuous memory and on-demand DTC that sets when the LDCMA detects a high temperature LH headlamp internal daytime running/parking lamp circuit driver.
LDCMA B124B:87 Left Daytime Running Light: 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 B124A:11 Right Daytime Running Light: 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 daytime running/parking lamp circuit.
LDCMB B124A:12 Right Daytime Running Light: 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 daytime running/parking lamp circuit.
LDCMB B124A:13 Right Daytime Running Light: Circuit Open A continuous memory and on-demand DTC that sets when the LDCMB detects an open from the RH headlamp internal daytime running/parking lamp circuit.
LDCMB B124A:14 Right Daytime Running Light: 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 daytime running/parking lamp circuit.
LDCMB B124A:16 Right Daytime Running Light: 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 daytime running/parking lamp circuit.
LDCMB B124A:1E Right Daytime Running Light: 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 daytime running/parking lamp circuit.
LDCMB B124A:4B Right Daytime Running Light: Over Temperature A continuous memory and on-demand DTC that sets when the LDCMB detects a high temperature RH headlamp internal daytime running/parking lamp circuit driver.
LDCMB B124A:87 Right Daytime Running Light: 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
  • LDCMA ( LH headlamp)
  • LDCMB ( RH headlamp)
  • BCM

Visual Inspection and Pre-checks

  • Verify the BCMC (also known as the BJB ) fuse 100 (25A) ( LH headlamp) or fuse 101 (25A) ( RH headlamp) is OK.
A1 CHECK FRONT PARKING LAMP AND FRONT TURN SIGNAL LAMP OPERATION
  • Ignition ON.
  • Place the headlamp switch in the PARKING LAMPS position and observe the front parking lamps.
  • Activate the hazard lamp function and observe the front turn signal lamps.

Are the LH DRL , front parking lamps and turn signals all inoperative or are the RH DRL , 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 all the DRL are inoperative, GO to A9
If all the DRL are always ON, GO to A13
If an individual daytime running light is inoperative or not operating correctly, GO to A4
If an individual daytime running light is always on, GO to A11

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 A11
No REPAIR the circuit.

A4 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 DTC B124B:16, B124B:1E or B124B:4B or LDCMB DTC B124A:16, B124A:1E or B124A:4B present?
Yes GO to A5
No GO to A7

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
  • Ignition ON.
  • Allow the vehicles and headlamps to cool to room temperature.
  • After the headlamps cool, using a diagnostic scan tool, perform the LDCMA ( LH headlamp) or LDCMB ( RH headlamp) self-test.

Is LDCMA DTC B124B:16, B124B:1E or B124B:4B or LDCMB DTC B124A:16, B124A:1E or B124A:4B present?
Yes GO to A11
No GO to A6

A6 RECHECK THE DRL (DAYTIME RUNNING LAMPS)
  • Operate the vehicle and observe the DRL .

Do the DRL operate correctly?
Yes INSPECT the headlamp and LDCM for damage or debris. The DTC set and DRL stopped working do to the headlamp or LDCM overheating.
No GO to A7

A7 CHECK THE HEADLAMP MOUNTED LDCM (LIGHTING DRIVER CONTROL MODULE) VOLTAGE CIRCUITS 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
      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 A8
No REPAIR the circuit.

A8 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 A11
No REPAIR the circuit.

A9 CHECK THAT THE DRL (DAYTIME RUNNING LAMPS) ARE ENABLED
  • For conventional DRL , check if the DRL are enabled through a diagnostic scan tool.
  • For configurable DRL , check if the DRL are enabled through the IPC .

Are the DRL enabled?
Yes GO to A10
No For conventional DRL , Using a diagnostic scan tool, ENABLE the DRL .
For configurable DRL , ENABLE the DRL . REFER to the Owner's Literature for information on enabling the DRL .

A10 CHECK THE OPERATION OF THE PARKING LAMPS
  • Ignition ON.
  • Place the headlamp switch in the PARKING LAMPS position and observe the front parking lamps.
  • Place the headlamp switch in the OFF position and observe the headlamps.

Do the parking lamps operate correctly?
Yes GO to A13
No
REFER to: Parking, Rear and License Plate Lamps (417-01 Exterior Lighting, Diagnosis and Testing).

A11 CHECK THE HEADLAMP
  • Ignition OFF.
  • Substitute the known good headlamp assembly from the opposite side of the vehicle.
  • Ignition ON.
  • 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.
  • Operate the vehicle and observe the DRL .

Is the concern still present or do the Diagnostic Trouble Codes (DTCs) return?
Yes GO to A13
No GO to A12

A12 CHECK THE HEADLAMP MOUNTED LDCM (LIGHTING DRIVER CONTROL MODULE)
  • Ignition OFF.
  • Reinstall the original headlamp assembly for the inoperative side of the vehicle.
  • INSTALL a new LDCM on the suspect headlamp.
    REFER to: Light Sensor (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.
  • 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.
  • Operate the vehicle and observe the DRL .

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 .

A13 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 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.


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