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Pinpoint Test A : All The STOPLAMPS Are Inoperative

WARNING: This page is about a different car, the 2018 Ford F-550 Super Duty, 2018 Ford F-450 Super Duty, 2018 Ford F-350 Super Duty, and 2018 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.

  1. A1 CHECK THE STOPLAMP SWITCH VOLTAGE SUPPLY CIRCUIT FOR AN OPEN

    • Ignition OFF.

    • Disconnect: BPP (Stoplamp) Switch C278 .

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C278-1
      GFD200696Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the voltage greater than 11 volts? 

    Yes  GO to  A2
    No  VERIFY the BCM fuse 9 (10A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the OEM Wiring Diagrams to identify the possible causes of the circuit short.

  2. A2 BYPASS THE STOPLAMP SWITCH

    • Connect a fused jumper:
      Positive Lead Measurement / Action Negative Lead
      C278-1
      GFD205997Courtesy of FORD MOTOR COMPANY
      		 C278-4

    • Ignition ON.

    Do the stoplamps illuminate? 

    Yes  REMOVE the fused jumper wire. INSTALL a new stoplamp switch. Refer to: Stoplamp Switch .
    No  LEAVE the fused jumper wire connected. GO to  A3

  3. A3 CHECK THE STOPLAMP SWITCH INPUT CIRCUIT FOR AN OPEN

    • Ignition OFF.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C278-1
      GFD200696Courtesy of FORD MOTOR COMPANY
      		 C2280A-1

    Is the voltage greater than 11 volts? 

    Yes  REMOVE the fused jumper wire. GO to  A4
    No  REMOVE the fused jumper wire. REPAIR the circuit

  4. A4 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 Hardware 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.
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