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Pinpoint Test B : The Reversing Lamps Are On Continuously

WARNING: This page is about a different car, the 2020 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.

  1. B1 CHECK THE PCM (POWERTRAIN CONTROL MODULE) GEAR COMMANDED PID (PARAMETER IDENTIFICATION)

    • Apply the parking brake.

    • Ignition ON.

    • Using a diagnostic scan tool, view PCM Parameter Identifications (PIDs).

    • Monitor the Gear Commanded (GEAR_CMD) PID.

    • Place the gear selector lever in each position.

    Does the PID indicate reverse when the gear selector is not in reverse? 

    Yes  DIAGNOSE the transmission range concern. REFER to: EXTERNAL CONTROLS .
    No  GO to  B2

  2. B2 CHECK THE REVERSING LAMPS SUPPLY CIRCUIT FOR A SHORT TO VOLTAGE

    • Ignition OFF.

    • Disconnect: BCM C2280C.

    • Ignition ON.

    Does either reversing lamp continue to illuminate? 

    Yes  REPAIR the affected circuit.
    No  GO to  B3

  3. B3 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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