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Pinpoint Test B : One Front Turn Signal Lamp Is Inoperative Or Always On - Halogen Headlamps

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  1. B1 DETERMINE IF ANY TURN LAMP IS ALWAYS ON

    • Ignition ON.

    • Activate the hazard lamp function.

    • Observe the front turn lamps.

    Is any turn lamp continuously illuminated (not flashing)? 

    Yes  GO to  B2
    No  GO to  B3

  2. B2 CHECK THE FRONT TURN LAMP VOLTAGE SUPPLY CIRCUIT FOR A SHORT TO VOLTAGE

    • Ignition OFF.

    • Deactivate the hazard lamp function.

    • Disconnect: BCM C2280F.

    • Ignition ON.

    Does the turn lamp in question continue to illuminate? 

    Yes  REPAIR the affected circuit.
    No  GO to  B8

  3. B3 CHECK FOR VOLTAGE TO THE FRONT TURN LAMP

    • Ignition OFF.

    • Deactivate the hazard lamp function.

    • Disconnect: LH Front Park/Turn Lamp C1023 or RH Front Park/Turn Lamp C1043.

    • Ignition ON.

    • Activate the hazard flasher lamp function.

    • Measure:

      LH Turn Lamp 

      Positive Lead Measurement / Action Negative Lead
      C1023-3
      GFD410233Courtesy of FORD MOTOR COMPANY
      		 Ground

      RH Turn Lamp 

      Positive Lead Measurement / Action Negative Lead
      C1043-3
      GFD410233Courtesy of FORD MOTOR COMPANY
      		 Ground

    Does the voltage alternate from 0 to greater than 11 volts? 

    Yes  GO to  B5
    No  GO to  B4

  4. B4 REPEAT THE ON-DEMAND SELF-TEST AND CHECK FOR VOLTAGE TO THE FRONT TURN LAMP

    • 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).

    • Measure:

      LH Turn Lamp 

      Positive Lead Measurement / Action Negative Lead
      C1023-3
      GFD410233Courtesy of FORD MOTOR COMPANY
      		 Ground

      RH Turn Lamp 

      Positive Lead Measurement / Action Negative Lead
      C1043-3
      GFD410233Courtesy of FORD MOTOR COMPANY
      		 Ground

    Does the voltage alternate from 0 to greater than 11 volts? 

    Yes  For halogen headlamps and inoperative front turn lamp, INSTALL a new front park/turn lamp bulb. REFER to: Front Turn Signal Lamp Bulb .
    No  GO to  B6

  5. B5 CHECK THE HEADLAMP GROUND CIRCUIT FOR AN OPEN

    • Measure:

      LH Turn Lamp 

      Positive Lead Measurement / Action Negative Lead
      C1023-3
      GFD410233Courtesy of FORD MOTOR COMPANY
      		 C1023-1

      RH Turn Lamp 

      Positive Lead Measurement / Action Negative Lead
      C1043-3
      GFD410233Courtesy of FORD MOTOR COMPANY
      		 C1043-1

    Does the voltage alternate from 0 to greater than 11 volts? 

    Yes  For halogen headlamps and inoperative front turn lamp, INSTALL a new front park/turn lamp bulb. REFER to: Front Turn Signal Lamp Bulb .
    No  REPAIR the circuit.

  6. B6 CHECK THE FRONT TURN LAMP SUPPLY CIRCUIT FOR A SHORT TO GROUND

    • Ignition OFF.

    • Deactivate the hazard flasher lamp function.

    • Disconnect: BCM C2280F.

    • Measure:

      LH Turn Lamp 

      Positive Lead Measurement / Action Negative Lead
      C1023-3
      GFD410234Courtesy of FORD MOTOR COMPANY
      		 Ground

      RH Turn Lamp 

      Positive Lead Measurement / Action Negative Lead
      C1043-3
      GFD410234Courtesy of FORD MOTOR COMPANY
      		 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, Refer to BCM Guided Routine .

  7. B7 CHECK THE FRONT TURN LAMP SUPPLY CIRCUIT FOR AN OPEN

    • Measure:

      LH Turn Lamp 

      Positive Lead Measurement / Action Negative Lead
      C1023-3
      GFD410234Courtesy of FORD MOTOR COMPANY
      		 C2280F-39

      RH Turn Lamp 

      Positive Lead Measurement / Action Negative Lead
      C1043-3
      GFD410234Courtesy of FORD MOTOR COMPANY
      		 C2280F-38

    Is the resistance less than 3 ohms? 

    Yes  GO to  B8
    No  REPAIR the circuit.

  8. B8 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 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, Refer to BCM Guided Routine .
    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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