Lincoln Navigator Manuals

Lincoln Navigator: Exterior Lighting / Stoplamps. Diagnosis and Testing

Lincoln Navigator 2018-2025 Workshop Manual / Lighting / Exterior Lighting / Stoplamps. 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 B1115:11 High Mounted Stop Lamp control: Circuit Short To Ground GO to Pinpoint Test B
BCM B1115:15 High Mounted Stop Lamp control: Circuit Short To Battery Or Open GO to Pinpoint Test B
BCM B1247:11 Left Rear Turn Indicator: Circuit Short To Ground GO to Pinpoint Test B
BCM B1247:15 Left Rear Turn Indicator: Circuit Short To Battery Or Open GO to Pinpoint Test B
BCM B1248:11 Right Rear Turn Indicator: Circuit Short To Ground GO to Pinpoint Test B
BCM B1248:15 Right Rear Turn Indicator: Circuit Short To Battery Or Open GO to Pinpoint Test B
BCM B1444:11 Left Rear Stop/Position Lamp Output: Circuit Short To Ground GO to Pinpoint Test B
BCM B1444:15 Left Rear Stop/Position Lamp Output: Circuit Short To Battery Or Open GO to Pinpoint Test B
BCM B1448:11 Right Rear Stop/Position Lamp Output: Circuit Short To Ground GO to Pinpoint Test B
BCM B1448:15 Right Rear Stop/Position Lamp Output: Circuit Short To Battery Or Open GO to Pinpoint Test B
BCM B14A0:11 Left Tailgate/Liftgate Lamps: Circuit Short To Ground GO to Pinpoint Test B
BCM B14A0:15 Left Tailgate/Liftgate Lamps: Circuit Short To Battery Or Open GO to Pinpoint Test B
BCM B14A1:11 Right Tailgate/Liftgate Lamps: Circuit Short To Ground GO to Pinpoint Test B
BCM B14A1:15 Right Tailgate/Liftgate Lamps: Circuit Short To Battery Or Open GO to Pinpoint Test B
BCM C0040:12 Brake Pedal Switch 'A': Circuit Short To Battery 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 > Stop > Inoperative GO to Pinpoint Test A
Lighting/Glass/Vision > Exterior Lighting > Stop > Inoperative GO to Pinpoint Test B
Lighting/Glass/Vision > Exterior Lighting > Stop > Stays On GO to Pinpoint Test A
Lighting/Glass/Vision > Exterior Lighting > Stop > Stays On GO to Pinpoint Test B
Lighting/Glass/Vision > Exterior Lighting > Center High Mount Stop (CHMSL) > Inoperative GO to Pinpoint Test A
Lighting/Glass/Vision > Exterior Lighting > Center High Mount Stop (CHMSL) > Inoperative GO to Pinpoint Test B
Lighting/Glass/Vision > Exterior Lighting > Center High Mount Stop (CHMSL) > Stays On GO to Pinpoint Test A
Lighting/Glass/Vision > Exterior Lighting > Center High Mount Stop (CHMSL) > Stays On GO to Pinpoint Test B

Symptom Chart(s)

Symptom Chart: Stoplamps

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 Possible Sources Actions
A module does not respond to the diagnostic scan tool
  • Fuse
  • Wiring, terminals or connectors
  • Module
 
REFER to: Controller Area Network (CAN) Module Communications Network (418-00A Controller Area Network (CAN) Module Communications Network, Diagnosis and Testing).
All the stoplamps are inoperative Refer to the Pinpoint Test   GO to Pinpoint Test A
One or more stoplamps are inoperative or always on Refer to the Pinpoint Test   GO to Pinpoint Test B

Pinpoint Tests


PINPOINT TEST A: ALL THE STOPLAMPS ARE INOPERATIVE OR ALWAYS ON

Refer to Wiring Diagrams Cell 90 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 C0040:12 Brake Pedal Switch 'A': Circuit Short To Battery An on-demand DTC that sets when the BCM detects a short to voltage from the stoplamp switch input circuit during the on-demand self-test.

Possible Sources

  • Wiring, terminals or connectors
  • BCM
A1 CHECK FOR ABS (ANTI-LOCK BRAKE SYSTEM) MODULE DIAGNOSTIC TROUBLE CODES (DTCS)
  • Ignition ON.
  • Using a diagnostic scan tool, perform the ABS module self-test.

Are any ABS module Diagnostic Trouble Codes (DTCs) present?
Yes
REFER to: Anti-Lock Brake System (ABS) and Stability Control (206-09 Anti-Lock Brake System (ABS) and Stability Control, Diagnosis and Testing).
No GO to A2

A2 CHECK THE STOPLAMP SWITCH INPUT CIRCUIT FOR AN OPEN
  • Ignition OFF.
  • Disconnect BCM C2280A .
  • Disconnect PCM C175B .
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C2280A-1   C175B-87

Is the resistance less than 3 ohms?
Yes GO to A3
No REPAIR the circuit

A3 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.

PINPOINT TEST B: AN INDIVIDUAL STOPLAMP IS INOPERATIVE OR ALWAYS ON

Refer to Wiring Diagrams Cell 90 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 B1115:11 High Mounted Stop Lamp control: Circuit Short To Ground A continuous memory and on-demand DTC that sets when the BCM detects a short to ground from the high mounted stoplamp voltage supply circuit.
BCM B1115:15 High Mounted Stop Lamp control: Circuit Short To Battery Or Open A continuous memory and on-demand DTC that sets when the BCM detects an open or short to voltage from the high mounted stoplamp voltage supply circuit.
BCM B1247:11 Left Rear Turn Indicator: Circuit Short To Ground A continuous memory and on-demand DTC that sets when the BCM detects a short to ground from the LH rear turn/stop lamp voltage supply circuit.
BCM B1247:15 Left Rear Turn Indicator: Circuit Short To Battery Or Open A continuous memory and on-demand DTC that sets when the BCM detects an open or short to voltage from the LH rear turn/stop lamp voltage supply circuit.
BCM B1248:11 Right Rear Turn Indicator: Circuit Short To Ground A continuous memory and on-demand DTC that sets when the BCM detects a short to ground from the right RH turn/stop lamp voltage supply circuit.
BCM B1248:15 Right Rear Turn Indicator: Circuit Short To Battery Or Open A continuous memory and on-demand DTC that sets when the BCM detects an open or short to voltage from the right RH turn/stop lamp voltage supply circuit.
BCM B1444:11 Left Rear Stop/Position Lamp Output: Circuit Short To Ground A continuous memory and on-demand DTC that sets when the BCM detects a short to ground from the LH rear stoplamp voltage supply circuit.
BCM B1444:15 Left Rear Stop/Position Lamp Output: Circuit Short To Battery Or Open A continuous memory and on-demand DTC that sets when the BCM detects an open or short to voltage from the LH rear stoplamp voltage supply circuit.
BCM B1448:11 Right Rear Stop/Position Lamp Output: Circuit Short To Ground A continuous memory and on-demand DTC that sets when the BCM detects a short to ground from the right RH stoplamp voltage supply circuit.
BCM B1448:15 Right Rear Stop/Position Lamp Output: Circuit Short To Battery Or Open A continuous memory and on-demand DTC that sets when the BCM detects an open or short to voltage from the right RH stoplamp voltage supply circuit.
BCM B14A0:11 Left Tailgate/Liftgate Lamps: Circuit Short To Ground A continuous memory and on-demand DTC that sets when the BCM detects a short to ground from the LH rear stoplamp voltage supply circuit.
BCM B14A0:15 Left Tailgate/Liftgate Lamps: Circuit Short To Battery Or Open A continuous memory and on-demand DTC that sets when the BCM detects an open or short to voltage from the LH rear stoplamp voltage supply circuit.
BCM B14A1:11 Right Tailgate/Liftgate Lamps: Circuit Short To Ground A continuous memory and on-demand DTC that sets when the BCM detects a short to ground from the right RH stoplamp voltage supply circuit.
BCM B14A1:15 Right Tailgate/Liftgate Lamps: Circuit Short To Battery Or Open A continuous memory and on-demand DTC that sets when the BCM detects an open or short to voltage from the right RH stoplamp voltage supply circuit.

Possible Sources

  • Wiring, terminals or connectors
  • Rear lamp assembly
  • High mounted stoplamp
  • BCM
B1 CHECK THE STOPLAMPS OPERATION
  • Ignition ON.
  • Apply the brake pedal and observe the rear and high mounted stoplamps.
  • Release the brake pedal and observe the rear and high mounted stoplamps.

Is any stoplamp always on?
Yes GO to B2
No For the high mounted stoplamp, GO to B3
For a rear lamp stoplamp, GO to B8

B2 CHECK THE BCM (BODY CONTROL MODULE) STOPLAMP OUTPUT CIRCUITS FOR A SHORT TO VOLTAGE
  • Ignition OFF.
  • Disconnect BCM C2280E .
  • Ignition ON.

Does the stoplamp in question continue to illuminate?
Yes REPAIR the affected circuit.
No GO to B13

B3 CHECK FOR VOLTAGE TO THE HIGH MOUNTED STOPLAMP
  • Ignition OFF.
  • Disconnect High Mounted Stoplamp C475 .
  • Ignition ON.
  • While applying the brake pedal, measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C475-1   Ground

Is the voltage greater than 11 volts?
Yes GO to B5
No GO to B4

B4 REPEAT THE ON-DEMAND SELF-TEST AND CHECK FOR VOLTAGE TO THE HIGH MOUNTED STOPLAMP
  • Release the brake pedal.
  • 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 if DTC U1000:00 is present).
  • Ignition OFF.
  • Ignition ON.
  • While applying the brake pedal, measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C475-1   Ground

Is the voltage greater than 11 volts?
Yes INSTALL a new high mounted stoplamp.
REFER to: High Mounted Stoplamp (417-01 Exterior Lighting, Removal and Installation).
No GO to B6

B5 CHECK THE HIGH MOUNTED STOPLAMP GROUND CIRCUIT FOR AN OPEN
  • While applying the brake pedal, measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C475-1   C475-2

Is the voltage greater than 11 volts?
Yes INSTALL a new high mounted stoplamp.
REFER to: High Mounted Stoplamp (417-01 Exterior Lighting, Removal and Installation).
No REPAIR the circuit.

B6 CHECK THE HIGH MOUNTED STOPLAMP SUPPLY CIRCUIT FOR A SHORT TO GROUND
  • Ignition OFF.
  • Disconnect BCM C2280E .
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C475-1   Ground

Is the resistance greater than 10,000 ohms?
Yes GO to B7
No 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).

B7 CHECK THE HIGH MOUNTED STOPLAMP SUPPLY CIRCUIT FOR AN OPEN
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C475-1   C2280E-13

Is the resistance less than 3 ohms?
Yes GO to B13
No REPAIR the circuit.

B8 CHECK FOR STOPLAMP VOLTAGE TO THE REAR LAMP ASSEMBLY
  • Ignition OFF.
  • Disconnect: Inoperative LH Rear Lamp Assembly C4483 or RH Rear Lamp Assembly C4484.
  • Ignition ON.
  • While applying the brake pedal, measure:
    Click to display connectors

      LH Stop Lamp


    Positive Lead Measurement / Action Negative Lead
      C4483-3   Ground

    Click to display connectors

      RH Stop Lamp


    Positive Lead Measurement / Action Negative Lead
      C4484-3   Ground

Is the voltage greater than 11 volts?
Yes GO to B10
No GO to B9

B9 REPEAT THE ON-DEMAND SELF-TEST AND CHECK FOR VOLTAGE TO THE REAR LAMP ASSEMBLY
  • Release the brake pedal.
  • 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.
  • While applying the brake pedal, measure:
    Click to display connectors

      LH Stop Lamp


    Positive Lead Measurement / Action Negative Lead
      C4483-3   Ground

    Click to display connectors

      RH Stop Lamp


    Positive Lead Measurement / Action Negative Lead
      C4484-3   Ground

Is the voltage greater than 11 volts?
Yes INSTALL a new rear lamp assembly.
REFER to: Rear Lamp Assembly (417-01 Exterior Lighting, Removal and Installation).
No GO to B11

B10 CHECK THE REAR STOPLAMP GROUND CIRCUIT FOR AN OPEN
  • While applying the brake pedal, measure:
    Click to display connectors

      LH Stop Lamp


    Positive Lead Measurement / Action Negative Lead
      C4483-3   C4483-1

    Click to display connectors

      RH Stop Lamp


    Positive Lead Measurement / Action Negative Lead
      C4484-3   C4484-1

Is the voltage greater than 11 volts?
Yes INSTALL a new rear lamp assembly.
REFER to: Rear Lamp Assembly (417-01 Exterior Lighting, Removal and Installation).
No REPAIR the circuit in question.

B11 CHECK THE REAR STOPLAMP SUPPLY CIRCUIT FOR A SHORT TO GROUND
  • Ignition OFF.
  • Disconnect BCM C2280E .
  • Measure:
    Click to display connectors

      LH Stop Lamp


    Positive Lead Measurement / Action Negative Lead
      C4483-3   Ground

    Click to display connectors

      RH Stop Lamp


    Positive Lead Measurement / Action Negative Lead
      C4484-3   Ground

Is the resistance greater than 10,000 ohms?
Yes GO to B12
No 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).

B12 CHECK THE REAR STOPLAMP SUPPLY CIRCUITS FOR AN OPEN
  • Measure:
    Click to display connectors

      LH Stop Lamp


    Positive Lead Measurement / Action Negative Lead
      C4483-3   C2280E-24

    Click to display connectors

      RH Stop Lamp


    Positive Lead Measurement / Action Negative Lead
      C4484-3   C2280E-23

Is the resistance less than 3 ohms?
Yes GO to B13
No REPAIR the circuit in question.

B13 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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