Lincoln Navigator Manuals

Lincoln Navigator: Exterior Lighting / Turn Signal and Hazard Lamps. Diagnosis and Testing

Lincoln Navigator 2018-2024 Workshop Manual / Lighting / Exterior Lighting / Turn Signal and Hazard 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).


Module DTC Description Action
BCM B1247:11 Left Rear Turn Indicator: Circuit Short To Ground GO to Pinpoint Test C
BCM B1247:15 Left Rear Turn Indicator: Circuit Short To Battery Or Open GO to Pinpoint Test C
BCM B1248:11 Right Rear Turn Indicator: Circuit Short To Ground GO to Pinpoint Test C
BCM B1248:15 Right Rear Turn Indicator: Circuit Short To Battery Or Open GO to Pinpoint Test C
BCM B1265:01 Left Rear Turn Lamp Feedback: General Electrical Failure GO to Pinpoint Test F
BCM B1266:01 Right Rear Turn Lamp Feedback: General Electrical Failure GO to Pinpoint Test F
BCM B1D35:11 Hazard Switch: Circuit Short To Ground GO to Pinpoint Test E
DDM B1D06:11 Left Turn Indicator: Circuit Short To Ground GO to Pinpoint Test D
DDM B1D06:15 Left Turn Indicator: Circuit Short To Battery Or Open GO to Pinpoint Test D
LDCMA B123A:11 Left Front Turn Indicator: Circuit Short To Ground GO to Pinpoint Test B
LDCMA B123A:12 Left Front Turn Indicator: Circuit Short To Battery GO to Pinpoint Test B
LDCMA B123A:13 Left Front Turn Indicator: Circuit Open GO to Pinpoint Test B
LDCMA B123A:14 Left Front Turn Indicator: Circuit Short To Ground Or Open GO to Pinpoint Test B
LDCMA B123A:16 Left Front Turn Indicator: Circuit Voltage Below Threshold GO to Pinpoint Test G
LDCMA B123A:1E Left Front Turn Indicator: Circuit Resistance Out Of Range GO to Pinpoint Test G
LDCMA B123A:4B Left Front Turn Indicator: Over Temperature GO to Pinpoint Test G
LDCMA B123A:87 Left Front Turn Indicator: Missing Message GO to Pinpoint Test B
LDCMB B123B:11 Right Front Turn Indicator: Circuit Short To Ground GO to Pinpoint Test B
LDCMB B123B:12 Right Front Turn Indicator: Circuit Short To Battery GO to Pinpoint Test B
LDCMB B123B:13 Right Front Turn Indicator: Circuit Open GO to Pinpoint Test B
LDCMB B123B:14 Right Front Turn Indicator: Circuit Short To Ground Or Open GO to Pinpoint Test B
LDCMB B123B:16 Right Front Turn Indicator: Circuit Voltage Below Threshold GO to Pinpoint Test G
LDCMB B123B:1E Right Front Turn Indicator: Circuit Resistance Out Of Range GO to Pinpoint Test G
LDCMB B123B:4B Right Front Turn Indicator: Over Temperature GO to Pinpoint Test G
LDCMB B123B:87 Right Front Turn Indicator: Missing Message GO to Pinpoint Test B
PDM B1D07:11 Right Turn Indicator: Circuit Short To Ground GO to Pinpoint Test D
PDM B1D07:15 Right Turn Indicator: Circuit Short To Battery Or Open GO to Pinpoint Test D
SCCM B124C:96 Turn Indicator Stalk Switch Pack: Component Internal Failure GO to Pinpoint Test H
SCCM B124C:9E Turn Indicator Stalk Switch Pack: Stuck On GO to Pinpoint Test H

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 > Turn Signal > Appearance GO to Pinpoint Test F
Lighting/Glass/Vision > Exterior Lighting > Turn Signal > Inoperative GO to Pinpoint Test A
Lighting/Glass/Vision > Exterior Lighting > Turn Signal > Inoperative GO to Pinpoint Test B
Lighting/Glass/Vision > Exterior Lighting > Turn Signal > Inoperative GO to Pinpoint Test C
Lighting/Glass/Vision > Exterior Lighting > Turn Signal > Inoperative GO to Pinpoint Test D
Lighting/Glass/Vision > Exterior Lighting > Turn Signal > Inoperative GO to Pinpoint Test E
Lighting/Glass/Vision > Exterior Lighting > Turn Signal > Inoperative GO to Pinpoint Test G
Lighting/Glass/Vision > Exterior Lighting > Turn Signal > Stays On GO to Pinpoint Test A
Lighting/Glass/Vision > Exterior Lighting > Turn Signal > Stays On GO to Pinpoint Test B
Lighting/Glass/Vision > Exterior Lighting > Turn Signal > Stays On GO to Pinpoint Test C
Lighting/Glass/Vision > Exterior Lighting > Turn Signal > Stays On GO to Pinpoint Test D
Lighting/Glass/Vision > Exterior Lighting > Turn Signal > Stays On GO to Pinpoint Test E
Lighting/Glass/Vision > Exterior Lighting > Turn Signal > Stays On GO to Pinpoint Test G

Symptom Chart(s)

Symptom Chart: Turn Signal and Hazard Lamps

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 Chart


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).
The turn signal function is inoperative or always on Refer to the Pinpoint Test   GO to Pinpoint Test A
One front turn signal lamp is inoperative or always on Refer to the Pinpoint Test   GO to Pinpoint Test B
One rear turn signal lamp is inoperative or always on Refer to the Pinpoint Test   GO to Pinpoint Test C
One exterior mirror turn signal lamp is inoperative or always on Refer to the Pinpoint Test   GO to Pinpoint Test D
The hazard lamp function is inoperative or always on Refer to the Pinpoint Test   GO to Pinpoint Test E
The turn signal indicator flashes fast when no turn signal lamps are inoperative - Rear lamps Refer to the Pinpoint Test   GO to Pinpoint Test F

Pinpoint Tests


PINPOINT TEST A: THE TURN SIGNAL FUNCTION 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).

Possible Sources

  • LH steering column multifunction switch
  • SCCM
  • BCM
A1 CHECK THE SCCM (STEERING COLUMN CONTROL MODULE) TURN SIGNAL PARAMETER IDENTIFICATIONS (PIDS)
  • Ignition ON.
  • Using a diagnostic scan tool, view SCCM Parameter Identifications (PIDs) below while placing the LH steering column multifunction switch in the left and right turn positions.

    • Access the  SCCM  and monitor the  TRN_SIG_SW_L  PID

    • Access the  SCCM  and monitor the  TRN_SIG_SW_R  PID


Do the Parameter Identifications (PIDs) match the LH steering column multifunction switch position?
Yes GO to A2
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 is still present, GO to A3

A2 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.

A3 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 Technical Service Bulletins (TSBs). If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no Technical Service Bulletins (TSBs) 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 B: ONE FRONT TURN SIGNAL LAMP IS INOPERATIVE, ALWAYS ON OR NOT OPERATING CORRECTLY

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
LDCMA B123A:11 Left Front Turn Indicator: Circuit Short To Ground A continuous memory and on-demand DTC that sets when the LDCMA detects a short to ground from the LH turn signal output circuit.
LDCMA B123A:12 Left Front Turn Indicator: Circuit Short To Battery A continuous memory and on-demand DTC that sets when the LDCMA detects a short to voltage from the LH turn signal output circuit.
LDCMA B123A:13 Left Front Turn Indicator: Circuit Open A continuous memory and on-demand DTC that sets when the LDCMA detects an open from the LH turn signal output circuit.
LDCMA B123A:14 Left Front Turn Indicator: Circuit Short To Ground Or Open A continuous memory and on-demand DTC that sets when the LDCMA detects an open or a short to ground from the LH turn signal output 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 .
LDCMB B123B:11 Right Front Turn Indicator: Circuit Short To Ground A continuous memory and on-demand DTC that sets when the LDCMB detects a short to ground from the RH turn signal output circuit.
LDCMB B123B:12 Right Front Turn Indicator: Circuit Short To Battery A continuous memory and on-demand DTC that sets when the LDCMB detects a short to voltage from the RH turn signal output circuit.
LDCMB B123B:13 Right Front Turn Indicator: Circuit Open A continuous memory and on-demand DTC that sets when the LDCMB detects an open from the RH turn signal output circuit.
LDCMB B123B:14 Right Front Turn Indicator: Circuit Short To Ground Or Open A continuous memory and on-demand DTC that sets when the LDCMB detects an open or a short to ground from the RH turn signal output circuit.
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 .

Possible Sources

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

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.
B1 CHECK FRONT PARKING LAMP AND DRL (DAYTIME RUNNING LAMPS) OPERATION
  • Ignition ON.
  • Place the headlamp switch in the PARKING LAMPS position and observe the front parking lamps.
  • Operate the vehicle and observe the DRL .

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 B2 If not OK, REFER to the Wiring Diagrams manual to identify the possible causes of the circuit short.
No If all the turn signals are inoperative or always on, GO to Pinpoint Test A
If an individual turn signal is inoperative, always on or not operating correctly, GO to B4

B2 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 B3
No REPAIR the circuit.

B3 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 B18
No REPAIR the circuit.

B4 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 B123A:11, B123A:12, B123A:13, B123A:14 or B123A:87 or LDCMB DTC B123B:11, B123B:12, B123B:13, B123B:14 or B123B:87 present?
Yes For DTC B123A:11, B123A:12, B123A:13, B123A:14, B123B:11, B123B:12, B123B:13 or B123B:14, GO to B9
For either DTC B123A:87 or B123B:87, GO to B7
For both Diagnostic Trouble Codes (DTCs) B123A:87 and B123B:87 set at the same time, GO to B5
No GO to B11

B5 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.
No GO to B6

B6 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 B7
No REPAIR the circuit.

B7 CHECK THE HEADLAMP CAN (CONTROLLER AREA NETWORK) CIRCUITS FOR AN OPEN
  • Ignition OFF.
  • Disconnect: For DTC B123A:87, LH Headlamp C1758 (if not previously disconnected).
  • Disconnect: For DTC B123B:87, RH Headlamp C1759 (if not previously disconnected).
  • Disconnect: HCM C2129 (if not previously disconnected).
  • For either DTC B123A:87 or B123B:87, measure:
    Click to display connectors

      For DTC B123A:87


    Positive Lead Measurement / Action Negative Lead
      C1758-11   C2129-5
      C1758-12   C2129-17

    Click to display connectors

      For DTC B123B:87


    Positive Lead Measurement / Action Negative Lead
      C1759-11   C2129-5
      C1759-12   C2129-17
  • For both Diagnostic Trouble Codes (DTCs) B123A:87 and B123B:87 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 B8
No REPAIR the circuit in question.

B8 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). CLEAR THE Diagnostic Trouble Codes (DTCs) and perform the LDCMA and LDCMB self-tests. If the Diagnostic Trouble Codes (DTCs) return, GO to B18
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.

B9 CHECK FOR LDCMA (LIGHTING DRIVER CONTROL MODULE A) OR LDCMB (LIGHTING DRIVER CONTROL MODULE B) DIAGNOSTIC TROUBLE CODES (DTCS) AFTER PMI (PROGRAMMABLE MODULE INSTALLATION)
  • CLEAR the Diagnostic Trouble Codes (DTCs), REPEAT the self-test (required to enable the lamp output driver) and cycle the ignition OFF and 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.
  • Activate the hazard lamp function.
  • Perform the LDCMA ( LH headlamp) or LDCMB ( RH headlamp) self-test.

Does the DTC return?
Yes GO to B13
No GO to B10

B10 CHECK THE VEHICLE HISTORY
  • Check the vehicle history for LDCMA DTC B123A:11, B123A:12, B123A:13 or B123A:14 or LDCMB DTC B123B:11, B123B:12, B123B:13 or B123B:14.

Has the vehicle set the same DTC in the past?
Yes GO to B13
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.

B11 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 B12
No REPAIR the circuit.

B12 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 B13
No REPAIR the circuit.

B13 CHECK TURN SIGNAL LAMP CIRCUITS FOR A SHORT TO VOLTAGE
  • Ignition OFF.
  • Check the vehicle history for LDCMA DTC B123A:11, B123A:12, B123A:13, B123A:14 or B123A:87 or LDCMB DTC B123B:11, B123B:12, B123B:13, B123B:14 or B123B:87.
  • Disconnect: For DTC B123A:11, B123A:12, B123A:13 or B123A:14, LH Headlamp C1758.
  • Disconnect: For DTC B123B:11, B123B:12, B123B:13 or B123B:14, RH Headlamp C1759.
  • Disconnect: For DTC B123A:11, B123A:12, B123A:13 or B123A:14, LH Front Turn Signal Lamp C156.
  • Disconnect: For DTC B123B:11, B123B:12, B123B:13 or B123B:14, RH Front Turn Signal Lamp C166.
  • Ignition ON.
  • Measure:
    Click to display connectors

      For LH Turn Signal or DTC B123A:11, B123A:12, B123A:13 or B123A:14


    Positive Lead Measurement / Action Negative Lead
      C156-1   Ground
      C156-2   Ground
      C156-4   Ground
      C156-5   Ground
      C156-6   Ground

    Click to display connectors

      For RH Turn Signal or DTC B123B:11, B123B:12, B123B:13 or B123B:14


    Positive Lead Measurement / Action Negative Lead
      C166-1   Ground
      C166-2   Ground
      C166-4   Ground
      C166-5   Ground
      C166-6   Ground

Is any voltage present?
Yes REPAIR the circuit in question.
No GO to B14

B14 CHECK THE TURN SIGNAL LAMP CIRCUITS FOR A SHORT TO GROUND
  • Ignition OFF.
  • Measure:
    Click to display connectors

      For LH Turn Signal or DTC B123A:11, B123A:12, B123A:13 or B123A:14


    Positive Lead Measurement / Action Negative Lead
      C156-1   Ground
      C156-2   Ground
      C156-4   Ground
      C156-5   Ground
      C156-6   Ground

    Click to display connectors

      For RH Turn Signal or DTC B123B:11, B123B:12, B123B:13 or B123B:14


    Positive Lead Measurement / Action Negative Lead
      C166-1   Ground
      C166-2   Ground
      C166-4   Ground
      C166-5   Ground
      C166-6   Ground

Is the resistance greater than 10,000 ohms?
Yes GO to B15
No REPAIR the circuit in question.

B15 CHECK THE TURN SIGNAL LAMP CIRCUITS FOR A SHORT TOGETHER
  • Ignition OFF.
  • Measure:
    Click to display connectors

      For LH Turn Signal or DTC B123A:11, B123A:12, B123A:13 or B123A:14


    Positive Lead Measurement / Action Negative Lead
      C156-1   C156-2
      C156-1   C156-4
      C156-1   C156-5
      C156-1   C156-6
      C156-2   C156-4
      C156-2   C156-5
      C156-2   C156-6
      C156-4   C156-5
      C156-4   C156-6
      C156-5   C156-6

    Click to display connectors

      For RH Turn Signal or DTC B123B:11, B123B:12, B123B:13 or B123B:14


    Positive Lead Measurement / Action Negative Lead
      C166-1   C166-2
      C166-1   C166-4
      C166-1   C166-5
      C166-1   C166-6
      C166-2   C166-4
      C166-2   C166-5
      C166-2   C166-6
      C166-4   C166-5
      C166-4   C166-6
      C166-5   C166-6

Is the resistance greater than 10,000 ohms?
Yes GO to B16
No REPAIR the circuit in question.

B16 CHECK THE TURN SIGNAL LAMP CIRCUITS FOR AN OPEN
  • Measure:
    Click to display connectors

      For LH Turn Signal or DTC B123A:11, B123A:12, B123A:13 or B123A:14


    Positive Lead Measurement / Action Negative Lead
      C156-1   C1758-8
      C156-2   C1758-16
      C156-4   C1758-15
      C156-5   C1758-7
      C156-6   C1758-6

    Click to display connectors

      For RH Turn Signal or DTC B123B:11, B123B:12, B123B:13 or B123B:14


    Positive Lead Measurement / Action Negative Lead
      C166-1   C1759-8
      C166-2   C1759-16
      C166-4   C1759-15
      C166-5   C1759-7
      C166-6   C1759-6

Is the resistance less than 3 ohms?
Yes GO to B17
No REPAIR the circuit.

B17 CHECK THE TURN SIGNAL LAMP
  • INSTALL a new front turn signal lamp.
    REFER to: Front Turn Signal Lamp (417-01 Exterior Lighting, Removal and Installation).
  • CLEAR the Diagnostic Trouble Codes (DTCs), REPEAT the self-test (required to enable the lamp output driver) and cycle the ignition OFF and 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.
  • Activate the hazard lamp function.
  • Perform the LDCMA ( LH headlamp) or LDCMB ( RH headlamp) self-test.

Does the DTC return?
Yes GO to B18
No The system is operating correctly at this time. The concern was caused by the front turn signal lamp.

B18 CHECK THE HEADLAMP MOUNTED LDCM (LIGHTING DRIVER CONTROL MODULE)
  • Ignition OFF.
  • 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.
  • Activate the hazard lamp function.
  • Perform the LDCMA ( LH headlamp) or LDCMB ( RH headlamp) self-test.

Does the DTC return?
Yes 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 .

B19 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 C: ONE REAR TURN SIGNAL LAMP 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 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 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 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 RH rear turn 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 RH rear turn lamp voltage supply circuit.

Possible Sources

  • Rear lamp assembly
  • Illuminated liftgate applique (reversing lamp assembly)
  • Wiring, terminals or connectors
  • BCM
C1 DETERMINE IF ANY TURN LAMP IS ALWAYS ON
  • Ignition ON.
  • Activate the hazard lamp function.
  • Observe the rear turn lamps.

Is any turn lamp continuously illuminated (not flashing)?
Yes GO to C2
No If only a single rear turn lamp or liftgate turn lamp are inoperative, GO to C3
If both the LH rear turn lamp and liftgate turn lamp are inoperative or both the RH rear turn lamp and liftgate turn lamp are inoperative, GO to C4

C2 CHECK THE REAR TURN LAMP VOLTAGE SUPPLY CIRCUIT FOR A SHORT TO VOLTAGE
  • Ignition OFF.
  • Deactivate the hazard lamp function.
  • Disconnect: BCM C2280E.
  • Ignition ON.

Does the turn lamp in question continue to illuminate?
Yes REPAIR the circuit in question.
No GO to C9

C3 CHECK THE REAR TURN LAMP OR LIFTGATE TURN LAMP SUPPLY VOLTAGE CIRCUIT FOR AN OPEN
  • Ignition OFF.
  • Deactivate the hazard flasher lamp function.
  • Disconnect: Inoperative LH Rear Lamp Assembly C4483 or RH Rear Lamp Assembly C4484.
  • Disconnect: Inoperative Illuminated Liftgate Applique C4352A.
  • Ignition ON.
  • Activate the hazard flasher lamp function.
  • For a rear turn lamp, measure:
    Click to display connectors

      LH Rear Turn Lamp


    Positive Lead Measurement / Action Negative Lead
      C4483-4   Ground

    Click to display connectors

      RH Rear Turn Lamp


    Positive Lead Measurement / Action Negative Lead
      C4484-4   Ground
  • For a liftgate turn lamp, measure:
    Click to display connectors

      LH Rear Turn Lamp


    Positive Lead Measurement / Action Negative Lead
      C4352A-5   Ground

    Click to display connectors

      RH Rear Turn Lamp


    Positive Lead Measurement / Action Negative Lead
      C4352A-3   Ground

Does the voltage alternate from 0 to greater than 11 volts?
Yes For a rear turn lamp, INSTALL a new rear lamp assembly.
REFER to: Rear Lamp Assembly (417-01 Exterior Lighting, Removal and Installation). For a liftgate turn lamp, INSTALL a new reversing lamp assembly.
REFER to: Reversing Lamp (417-01 Exterior Lighting, Removal and Installation).
No REPAIR the circuit.

C4 CHECK FOR REAR TURN LAMP SUPPLY VOLTAGE
  • Ignition OFF.
  • Deactivate the hazard flasher lamp function.
  • Disconnect: For inoperative LH rear parking and liftgate parking lamps, LH Rear Lamp C4483 .
  • Disconnect: For inoperative RH rear parking and liftgate parking lamps, RH Rear Lamp C4484.
  • Ignition ON.
  • Activate the hazard flasher lamp function.
  • Measure:
    Click to display connectors

      LH Rear Turn Lamp


    Positive Lead Measurement / Action Negative Lead
      C4483-4   Ground

    Click to display connectors

      RH Rear Turn Lamp


    Positive Lead Measurement / Action Negative Lead
      C4484-4   Ground

Does the voltage alternate from 0 to greater than 11 volts?
Yes REPAIR the turn signal ground circuit for an open.
No GO to C5

C5 REPEAT THE ON-DEMAND SELF-TEST AND CHECK FOR VOLTAGE TO THE REAR TURN LAMP
  • Clear the Diagnostic Trouble Codes (DTCs) and repeat the self-test (required to enable the lamp output driver if DTC U1000:00 is present).
  • Measure:
    Click to display connectors

      LH Rear Turn Lamp


    Positive Lead Measurement / Action Negative Lead
      C4483-4   Ground

    Click to display connectors

      RH Rear Turn Lamp


    Positive Lead Measurement / Action Negative Lead
      C4484-4   Ground

Does the voltage alternate from 0 to 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 C6

C6 REPEAT THE ON-DEMAND SELF-TEST AND CHECK FOR VOLTAGE TO THE REAR TURN LAMP WITH THE LIFTGATE APPLIQUE DISCONNECTED
  • Ignition OFF.
  • Disconnect: Inoperative Illuminated Liftgate Applique C4352A.
  • Ignition ON.
  • Clear the Diagnostic Trouble Codes (DTCs) and repeat the self-test (required to enable the lamp output driver if DTC U1000:00 is present).
  • Measure:
    Click to display connectors

      LH Rear Turn Lamp


    Positive Lead Measurement / Action Negative Lead
      C4483-4   Ground

    Click to display connectors

      RH Rear Turn Lamp


    Positive Lead Measurement / Action Negative Lead
      C4484-4   Ground

Does the voltage alternate from 0 to greater than 11 volts?
Yes INSTALL a new reversing lamp assembly.
REFER to: Reversing Lamp (417-01 Exterior Lighting, Removal and Installation).
No GO to C7

C7 CHECK THE REAR TURN LAMP SUPPLY CIRCUIT FOR A SHORT TO GROUND
  • Ignition OFF.
  • Deactivate the hazard flasher lamp function.
  • Disconnect: BCM C2280E.
  • Measure:
    Click to display connectors

      LH Rear Turn Lamp


    Positive Lead Measurement / Action Negative Lead
      C2280E-26   Ground

    Click to display connectors

      RH Rear Turn Lamp


    Positive Lead Measurement / Action Negative Lead
      C2280E-52   Ground

Is the resistance greater than 10,000 ohms?
Yes GO to C8
No REPAIR the circuit. After the repair:
If no Diagnostic Trouble Codes (DTCs) are present, TEST the system for normal operation.
If any BCM Diagnostic Trouble Codes (DTCs) other than DTC U3000:49 are present, CLEAR the Diagnostic Trouble Codes (DTCs), REPEAT the self-test (required to enable the lamp output driver) and cycle the ignition OFF and ON. TEST the system for normal operation.
If DTC U3000:49 is present, INSTALL a new BCM .
REFER to: Body Control Module (BCM) (419-10 Multifunction Electronic Modules, Removal and Installation).

C8 CHECK THE REAR TURN LAMP SUPPLY CIRCUIT FOR AN OPEN
  • Measure:
    Click to display connectors

      LH Rear Turn Lamp


    Positive Lead Measurement / Action Negative Lead
      C4483-4   C2280E-26

    Click to display connectors

      RH Rear Turn Lamp


    Positive Lead Measurement / Action Negative Lead
      C4484-4   C2280E-52

Is the resistance less than 3 ohms?
Yes GO to C9
No REPAIR the circuit.

C9 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 D: ONE EXTERIOR MIRROR TURN SIGNAL LAMP 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
DDM B1D06:11 Left Turn Indicator: Circuit Short To Ground A continuous memory DTC that sets when the DDM detects a short to ground from the exterior mirror turn lamp voltage supply circuit.
DDM B1D06:15 Left Turn Indicator: Circuit Short To Battery Or Open A continuous memory DTC that sets when the DDM detects an open or short to voltage from the exterior mirror turn lamp voltage supply circuit.
PDM B1D07:11 Right Turn Indicator: Circuit Short To Ground A continuous memory and on-demand DTC that sets when the PDM detects a short to ground from the exterior mirror turn lamp voltage supply circuit
PDM B1D07:15 Right Turn Indicator: Circuit Short To Battery Or Open A continuous memory and on-demand DTC that sets when the PDM detects an open or short to voltage from the exterior mirror turn lamp voltage supply circuit

Possible Sources

  • Exterior mirror turn signal lamp
  • Exterior mirror
  • Wiring, terminals or connectors
  • DDM
  • PDM
D1 DETERMINE IF ANY TURN LAMP IS ALWAYS ON
  • Ignition ON.
  • Activate the hazard lamp function.
  • Observe the front and the rear turn lamps.

Is any turn lamp continuously illuminated (not flashing)?
Yes GO to D2
No GO to D3

D2 CHECK THE EXTERIOR MIRROR TURN VOLTAGE SUPPLY CIRCUIT FOR A SHORT TO VOLTAGE
  • Ignition OFF.
  • Deactivate the hazard lamp function.
  • Disconnect DDM C501B (LH exterior mirror lamp).
  • Disconnect PDM C652B ( RH exterior mirror lamp).
  • Ignition ON.

Does the turn lamp in question continue to illuminate?
Yes REPAIR the affected circuit.
No For the LH exterior mirror turn lamp, GO to D7
For the RH exterior mirror turn lamp, GO to D8

D3 CHECK FOR VOLTAGE TO THE EXTERIOR MIRROR TURN LAMP
  • Ignition OFF.
  • Deactivate the hazard flasher lamp function.
  • Disconnect Inoperative, LH Exterior Mirror C516 or RH Exterior Mirror C622 .
  • Ignition ON.
  • Activate the hazard flasher lamp function.
  • Measure:
    Click to display connectors

      LH Exterior Mirror Turn Lamp


    Positive Lead Measurement / Action Negative Lead
      C516-10   Ground

    Click to display connectors

      RH Exterior Mirror Turn Lamp


    Positive Lead Measurement / Action Negative Lead
      C622-10   Ground

Does the voltage alternate from 0 to greater than 11 volts?
Yes GO to D4
No GO to D5

D4 CHECK THE EXTERIOR MIRROR TURN LAMP GROUND
  • Measure:
    Click to display connectors

      LH Exterior Mirror Turn Lamp


    Positive Lead Measurement / Action Negative Lead
      C516-10   C516-2

    Click to display connectors

      RH Exterior Mirror Turn Lamp


    Positive Lead Measurement / Action Negative Lead
      C622-10   C622-2

Does the voltage alternate from 0 to greater than 11 volts?
Yes CHECK the exterior mirror jumper harness between the vehicle harness and the parking lamp for open circuits and damaged or pushed-out pins. If the jumper harness is OK, INSTALL a new exterior mirror turn lamp.
REFER to: Exterior Mirror (501-09 Rear View Mirrors, Removal and Installation).
If the harness cannot be repaired, INSTALL a new exterior mirror turn lamp. REFER to: Exterior Mirror (501-09 Rear View Mirrors, Removal and Installation).
No REPAIR the circuit.

D5 CHECK THE EXTERIOR MIRROR TURN LAMP SUPPLY CIRCUIT FOR A SHORT TO GROUND
  • Ignition OFF.
  • Deactivate the hazard flasher lamp function.
  • Disconnect DDM C501B (LH exterior mirror lamp).
  • Disconnect PDM C652B (RH exterior mirror lamp).
  • Measure:
    Click to display connectors

      LH Exterior Mirror Turn Lamp


    Positive Lead Measurement / Action Negative Lead
      C516-10   Ground

    Click to display connectors

      RH Exterior Mirror Turn Lamp


    Positive Lead Measurement / Action Negative Lead
      C622-10   Ground

Is the resistance greater than 10,000 ohms?
Yes GO to D6
No REPAIR the circuit.

D6 CHECK THE MIRROR TURN LAMP SUPPLY CIRCUIT FOR AN OPEN
  • Measure:
    Click to display connectors

      LH Exterior Mirror Turn Lamp


    Positive Lead Measurement / Action Negative Lead
      C516-10   C501B-4

    Click to display connectors

      RH Exterior Mirror Turn Lamp


    Positive Lead Measurement / Action Negative Lead
      C622-10   C652B-4

Is the resistance less than 3 ohms?
Yes For the LH exterior mirror turn lamp, GO to D7
For the RH exterior mirror turn lamp, GO to D8
No REPAIR the circuit.

D7 CHECK FOR CORRECT DDM (DRIVER DOOR MODULE) OPERATION
  • Disconnect and inspect all DDM 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 DDM 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 Technical Service Bulletins (TSBs). If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no Technical Service Bulletins (TSBs) address this concern, INSTALL a new DDM .
REFER to: Driver Door Module (DDM) (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.

D8 CHECK FOR CORRECT PDM (PASSENGER DOOR MODULE) OPERATION
  • Disconnect and inspect all PDM 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 PDM 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 Technical Service Bulletins (TSBs). If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no Technical Service Bulletins (TSBs) address this concern, INSTALL a new PDM .
REFER to: Passenger Door Module (PDM) (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 E: THE HAZARD LAMP FUNCTION 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 B1D35:11 Hazard Switch: Circuit Short To Ground A continuous memory and on-demand DTC that sets when the BCM detects a short to ground from the hazard lamp function input circuit.

Possible Sources

  • Wiring, terminals or connectors
  • Hazard flasher switch
  • BCM
E1 CHECK FOR BCM (BODY CONTROL MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)
  • Ignition ON.
  • Using a diagnostic scan tool, perform the BCM self-test.

Is DTC B1D35:11 present?
Yes GO to E2
No GO to E4

E2 ISOLATE THE HAZARD FLASHER SWITCH
  • Ignition OFF.
  • Disconnect Instrument Panel Console Switch Assembly 1 C2480 .
  • Ignition ON.
  • Using a diagnostic scan tool, clear the Diagnostic Trouble Codes (DTCs) and repeat the BCM self-test.

Is DTC B1D35:11 retrieved again?
Yes GO to E3
No INSTALL a new Instrument panel console switch assembly 1.

E3 CHECK THE HAZARD FLASHER SWITCH INPUT CIRCUIT FOR A SHORT TO GROUND
  • Ignition OFF.
  • Disconnect BCM C2280B .
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C2480-4   Ground

Is the resistance greater than 10,000 ohms?
Yes GO to E6
No REPAIR the circuit.

E4 CHECK FOR A VOLTAGE SIGNAL TO THE HAZARD FLASHER SWITCH
  • Ignition OFF.
  • Disconnect Instrument Panel Console Switch Assembly 1 C2480 .
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C2480-4   Ground

Is the voltage greater than 11 volts?
Yes INSTALL a new Instrument panel console switch assembly 1.
No GO to E5

E5 CHECK THE HAZARD FLASHER SWITCH INPUT CIRCUIT FOR AN OPEN
  • Ignition OFF.
  • Disconnect BCM C2280B .
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C2480-4   C2280B-19

Is the resistance less than 3 ohms?
Yes GO to E6
No REPAIR the circuit.

E6 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 F: THE TURN SIGNAL INDICATOR FLASHES FAST WHEN NO TURN SIGNAL LAMPS ARE INOPERATIVE - REAR LAMPS

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 B1265:01 Left Rear Turn Lamp Feedback: General Electrical Failure A continuous memory DTC that sets when the BCM detects an electrical failure from the LH rear turn lamp outage circuit when the turn lamp is activated.
BCM B1266:01 Right Rear Turn Lamp Feedback: General Electrical Failure A continuous memory DTC that sets when the BCM detects an electrical failure from the RH rear turn lamp outage circuit when the turn lamp is activated.

Possible Sources

  • Wiring, terminals or connectors
  • BCM
F1 CHECK FOR BCM (BODY CONTROL MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)
  • Ignition ON.
  • Using a diagnostic scan tool, perform the BCM self-test.

Is DTC B1265:01 or B1266:01 present?
Yes GO to F6
No GO to F2

F2 DETERMINE IF THE VEHICLE IS EQUIPPED WITH A TRM (TRAILER MODULE)
  • Using a diagnostic scan tool, perform a network test.

Does the test indicate the presence of a TRM and pass the network test?
Yes GO to F3
No If a TRM is present and did not pass the network test, DIAGNOSE no communication with the TRM .
REFER to: Controller Area Network (CAN) Module Communications Network (418-00A Controller Area Network (CAN) Module Communications Network, Diagnosis and Testing). If a TRM is not present, GO to F6

F3 CHECK THE RECORDED DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE BCM (BODY CONTROL MODULE) AND TRM (TRAILER MODULE) SELF-TEST
  • Using a diagnostic scan tool, perform the BCM , and TRM self-test.

Are any communication Diagnostic Trouble Codes (DTCs) present?
Yes DIAGNOSE the communication Diagnostic Trouble Codes (DTCs) first.
For BCM Diagnostic Trouble Codes (DTCs), REFER to the Master DTC Chart.
For TRM Diagnostic Trouble Codes (DTCs),
REFER to: Trailer Lamps (417-01 Exterior Lighting, Diagnosis and Testing).
No GO to F4

F4 ISOLATE THE TRM (TRAILER MODULE)
  • Ignition OFF.
  • Disconnect: TRM C2498C.
  • Disconnect: TRM C2498F.
  • Ignition ON.
  • Activate the suspect turn lamps.

Do the turn lamps operate correctly?
Yes GO to F5
No GO to Pinpoint Test C

F5 CHECK FOR CORRECT TRM (TRAILER MODULE) OPERATION
  • Disconnect and inspect all TRM 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 TRM 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 TRM .
REFER to: Trailer Module (TRM) (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.

F6 CHECK THE TURN LAMP OUTAGE CIRCUIT FOR A SHORT TO GROUND (WITH DTC (DIAGNOSTIC TROUBLE CODE) )
  • Ignition OFF.
  • Disconnect: For DTC B1265:01, LH Rear Lamp C4483.
  • Disconnect: For DTC B1266:01, RH Rear Lamp C4484.
  • Disconnect: BCM C2280E.
  • Measure:
    Click to display connectors

      For DTC B1265:01


    Positive Lead Measurement / Action Negative Lead
      C4483-6   Ground

    Click to display connectors

      For DTC B1266:01


    Positive Lead Measurement / Action Negative Lead
      C4484-6   Ground

Is the resistance greater than 10,000 ohms?
Yes GO to F7
No REPAIR the circuit.

F7 CHECK THE TURN LAMP OUTAGE CIRCUIT FOR AN OPEN (WITH DTC (DIAGNOSTIC TROUBLE CODE) )
  • Measure:
    Click to display connectors

      For DTC B1265:01


    Positive Lead Measurement / Action Negative Lead
      C4483-6   C2280E-31

    Click to display connectors

      For DTC B1266:01


    Positive Lead Measurement / Action Negative Lead
      C4484-6   C2280E-44

Is the resistance less than 3 ohms?
Yes GO to F10
No REPAIR the circuit.

F8 CHECK THE TURN LAMP OUTAGE CIRCUIT FOR A SHORT TO GROUND (NO DTC (DIAGNOSTIC TROUBLE CODE) PRESENT)
  • Ignition OFF.
  • Disconnect: LH Rear Lamp C4483 and RH Rear Lamp C4484.
  • Disconnect: BCM C2280E.
  • Measure:
    Click to display connectors

      For LH Rear Turn Lamp


    Positive Lead Measurement / Action Negative Lead
      C4483-6   Ground

    Click to display connectors

      For RH Rear Turn Lamp


    Positive Lead Measurement / Action Negative Lead
      C4484-6   Ground

Is the resistance greater than 10,000 ohms?
Yes GO to F9
No REPAIR the circuit in question.

F9 CHECK THE FRONT TURN LAMP OUTAGE CIRCUIT FOR AN OPEN (WITH DTC (DIAGNOSTIC TROUBLE CODE) )
  • Measure:
    Click to display connectors

      For LH Rear Turn Lamp


    Positive Lead Measurement / Action Negative Lead
      C4483-6   C2280E-31

    Click to display connectors

      For RH Rear Turn Lamp


    Positive Lead Measurement / Action Negative Lead
      C4484-6   C2280E-44

Is the resistance less than 3 ohms?
Yes GO to F10
No REPAIR the circuit in question.

F10 CHECK THE REAR LAMP
  • Deactivate the hazard lamp function, if activated.
  • Ignition OFF.
  • Substitute the known good rear lamp 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.
  • Ignition OFF.
  • Ignition ON.
  • Activate the hazard flasher lamp function.
  • Observe the system and determine if the concern is still present.

Is the concern still present or does the DTC return?
Yes GO to F11
No INSTALL a new rear lamp assembly.
REFER to: Rear Lamp Assembly (417-01 Exterior Lighting, Removal and Installation).

F11 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 G: B123A:16, B123A:1E, B123A:4B, B123B:16, B123B:1E, B123B:4B

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
LDCMA B123A:16 Left Front Turn Indicator: Circuit Voltage Below Threshold A continuous memory and on-demand DTC that sets when the LDCMA detects a voltage below the calibrated value from the LH turn signal output circuit.
LDCMA B123A:1E Left Front Turn Indicator: Circuit Resistance Out Of Range A continuous memory and on-demand DTC that sets when the LDCMA detects a resistance outside of the calibrated value from the LH turn signal lamp.
LDCMA B123A:4B Left Front Turn Indicator: Over Temperature A continuous memory and on-demand DTC that sets when the LDCMA detects a temperature above a calibrated temperature range from the LH turn signal lamp.
LDCMB B123B:16 Right Front Turn Indicator: Circuit Voltage Below Threshold A continuous memory and on-demand DTC that sets when the LDCMB detects a voltage below the calibrated value from the RH turn signal output circuit.
LDCMB B123B:1E Right Front Turn Indicator: Circuit Resistance Out Of Range A continuous memory and on-demand DTC that sets when the LDCMB detects a resistance outside of the calibrated value from the RH turn signal lamp.
LDCMB B123B:4B Right Front Turn Indicator: Over Temperature A continuous memory and on-demand DTC that sets when the LDCMB detects a temperature above a calibrated temperature range from the RH turn signal lamp.

Possible Sources

  • Wiring, terminals or connectors
  • LDCMA ( LH headlamp)
  • LDCMB ( RH headlamp)
  • Front turn signal lamp
  • Headlamp assembly
G1 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 vehicle turn lamps to cool to room temperature.
  • After the turn lamps cool, using a diagnostic scan tool, CLEAR the Diagnostic Trouble Codes (DTCs), REPEAT the self-test (required to enable the lamp output driver) and cycle the ignition OFF and ON.
  • Activate the hazard lamp function.
  • Perform the LDCMA ( LH headlamp) or LDCMB ( RH headlamp) self-test.

Is LDCMA DTC B123A:16, B123A:1E or B123A:4B or LDCMB DTC B123B:16, B123B:1E or B123B:4B present?
Yes GO to G3
No GO to G2

G2 CHECK THE VEHICLE HISTORY
  • Check the vehicle history for LDCMA DTC B123A:16, B123A:1E or B123A:4B or LDCMB DTC B123B:16, B123B:1E or B123B:4B.

Has the vehicle set the same DTC in the past?
Yes GO to G3
No INSPECT the front turn signal lamp, headlamp and LDCM for damage or debris. The DTC set and DRL stopped working do to the front turn signal lamp or LDCM temporarily overheating.

G3 CHECK THE TURN SIGNAL LAMP
  • INSTALL a new front turn signal lamp.
    REFER to: Front Turn Signal Lamp (417-01 Exterior Lighting, Removal and Installation).
  • CLEAR the Diagnostic Trouble Codes (DTCs), REPEAT the self-test (required to enable the lamp output driver) and cycle the ignition OFF and 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.
  • Activate the hazard lamp function.
  • Perform the LDCMA ( LH headlamp) or LDCMB ( RH headlamp) self-test.

Is LDCMA DTC B123A:16, B123A:1E or B123A:4B or LDCMB DTC B123B:16, B123B:1E or B123B:4B present?
Yes GO to G4
No The system is operating correctly at this time. The concern was caused by the front turn signal lamp.

G4 CHECK TURN SIGNAL LAMP CIRCUITS FOR A SHORT TO VOLTAGE
  • Ignition OFF.
  • Disconnect: For DTC B123A:16, B123A:1E or B123A:4B, LH Headlamp C1758.
  • Disconnect: For DTC B123B:16, B123B:1E or B123B:4B, RH Headlamp C1759.
  • Disconnect: For DTC B123A:16, B123A:1E or B123A:4B, LH Front Turn Signal Lamp C156.
  • Disconnect: For DTC B123B:16, B123B:1E or B123B:4B, RH Front Turn Signal Lamp C166.
  • Ignition ON.
  • Measure:
    Click to display connectors

      For DTC B123A:16, B123A:1E or B123A:4B


    Positive Lead Measurement / Action Negative Lead
      C156-1   Ground
      C156-2   Ground
      C156-4   Ground
      C156-5   Ground
      C156-6   Ground

    Click to display connectors

      For DTC B123B:16, B123B:1E or B123B:4B


    Positive Lead Measurement / Action Negative Lead
      C166-1   Ground
      C166-2   Ground
      C166-4   Ground
      C166-5   Ground
      C166-6   Ground

Is any voltage present?
Yes REPAIR the circuit in question.
No GO to G5

G5 CHECK THE TURN SIGNAL LAMP CIRCUITS FOR A SHORT TO GROUND
  • Ignition OFF.
  • Measure:
    Click to display connectors

      For DTC B123A:16, B123A:1E or B123A:4B


    Positive Lead Measurement / Action Negative Lead
      C156-1   Ground
      C156-2   Ground
      C156-4   Ground
      C156-5   Ground
      C156-6   Ground

    Click to display connectors

      For DTC B123B:16, B123B:1E or B123B:4B


    Positive Lead Measurement / Action Negative Lead
      C166-1   Ground
      C166-2   Ground
      C166-4   Ground
      C166-5   Ground
      C166-6   Ground

Is the resistance greater than 10,000 ohms?
Yes GO to G6
No REPAIR the circuit in question.

G6 CHECK THE TURN SIGNAL LAMP CIRCUITS FOR A SHORT TOGETHER
  • Ignition OFF.
  • Measure:
    Click to display connectors

      For DTC B123A:16, B123A:1E or B123A:4B


    Positive Lead Measurement / Action Negative Lead
      C156-1   C156-2
      C156-1   C156-4
      C156-1   C156-5
      C156-1   C156-6
      C156-2   C156-4
      C156-2   C156-5
      C156-2   C156-6
      C156-4   C156-5
      C156-4   C156-6
      C156-5   C156-6

    Click to display connectors

      For DTC B123B:16, B123B:1E or B123B:4B


    Positive Lead Measurement / Action Negative Lead
      C166-1   C166-2
      C166-1   C166-4
      C166-1   C166-5
      C166-1   C166-6
      C166-2   C166-4
      C166-2   C166-5
      C166-2   C166-6
      C166-4   C166-5
      C166-4   C166-6
      C166-5   C166-6

Is the resistance greater than 10,000 ohms?
Yes GO to G7
No REPAIR the circuit in question.

G7 CHECK THE TURN SIGNAL LAMP CIRCUITS FOR AN OPEN
  • Measure:
    Click to display connectors

      For DTC B123A:16, B123A:1E or B123A:4B


    Positive Lead Measurement / Action Negative Lead
      C156-1   C1758-8
      C156-2   C1758-16
      C156-4   C1758-15
      C156-5   C1758-7
      C156-6   C1758-6

    Click to display connectors

      For DTC B123B:16, B123B:1E or B123B:4B


    Positive Lead Measurement / Action Negative Lead
      C166-1   C1759-8
      C166-2   C1759-16
      C166-4   C1759-15
      C166-5   C1759-7
      C166-6   C1759-6

Is the resistance less than 3 ohms?
Yes GO to G8
No REPAIR the circuit.

G8 CHECK THE HEADLAMP MOUNTED LDCM (LIGHTING DRIVER CONTROL MODULE)
  • Ignition OFF.
  • 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.
  • Activate the hazard lamp function.
  • Perform the LDCMA ( LH headlamp) or LDCMB ( RH headlamp) self-test.

Does the DTC return?
Yes 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 H: B124C:96, B124C:9E

Refer to Wiring Diagrams Cell 92 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
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
H1 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 B124C:96, B124C:9E or the condition return?
Yes GO to H2
No The system is operating correctly. The concern was caused by the LH steering column multifunction switch.

H2 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 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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