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Pinpoint Test C : The STOPLAMPS 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. C1 IDENTIFY THE CONTINUOUSLY ILLUMINATED STOPLAMPS

    • Ignition ON.

    • With the liftgate closed, observe the liftgate and high mounted stoplamps.

    • With the liftgate open, observe the auxiliary stoplamps (part of the rear side marker lamps).

    • Observe the stoplamps.

    Are all the stoplamps illuminated? 

    Yes  GO to  C3
    No  GO to  C2

  2. C2 CHECK THE BCM (BODY CONTROL MODULE) STOPLAMP OUTPUT CIRCUITS FOR A SHORT TO VOLTAGE

    • Ignition OFF.

    • For incandescent rear lamps, disconnect: BCM C2280F.

    • For LED rear lamps, disconnect: BCM C2280E.

    • Ignition ON.

    Does the stoplamp in question continue to illuminate? 

    Yes  REPAIR the affected circuit.
    No  GO to  C7

  3. C3 CHECK THE STOPLAMP SWITCH

    • Ignition OFF.

    • Disconnect: BPP (stoplamp) Switch C278.

    • Ignition ON.

    Do the stoplamps continue to illuminate? 

    Yes  GO to  C4
    No  INSTALL a new stoplamp switch. REFER to: Stoplamp Switch .

  4. C4 CHECK THE PCM (POWERTRAIN CONTROL MODULE)

    • Ignition OFF.

    • Disconnect: PCM C1232B (2.7L EcoBoost).

    • Disconnect: PCM C1551B (3.5L Duratec).

    • Disconnect: PCM C1915B (3.5L EcoBoost).

    • Disconnect: PCM C1381B (5.0L 32V Ti-VCT).

    • Disconnect: PCM C1233B (3.0L Duratorq-TDCi).

    • Ignition ON.

    Do the stoplamps continue to illuminate? 

    Yes  GO to  C5
    No  GO to  C6

  5. C5 CHECK THE STOPLAMP SWITCH INPUT CIRCUIT FOR A SHORT TO VOLTAGE

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C278-4
      GFD465489Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPAIR the circuit.
    No  GO to  C7

  6. C6 CHECK FOR CORRECT PCM (POWERTRAIN CONTROL MODULE) OPERATION

    • Disconnect and inspect all PCM 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 PCM 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 PCM Guided Routine Testing .
    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.

  7. C7 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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