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Pinpoint Test R: The STOPLAMP(S) Are On Continuously

WARNING: This page is about a different car, the 2014 Lincoln MKX and 2014 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.
  1. R1 DETERMINE IF ALL THE STOPLAMPS ARE ON 
    • Ignition ON.
    • Observe the stoplamps.

    Are all the stoplamps on? 

    • Yes  : GO to  R4.
    • No  : For MKX, GO to R2  .

      For Edge, GO to  R3.

  2. R2 CHECK THE STOPLAMP VOLTAGE SUPPLY CIRCUITS FOR A SHORT TO VOLTAGE 
    • Ignition OFF.
    • Disconnect: BCM C2280D  .
    • Ignition ON.

    Does any stoplamp continue to illuminate? 

    • Yes  : If the LH rear lamp continues to illuminate, REPAIR circuit CLS18 (GY/BN) for a short to voltage. TEST the system for normal operation.

      If the RH rear lamp continues to illuminate, REPAIR circuit CLS19 (VT/OG) for a short to voltage. TEST the system for normal operation.

      If the high mounted stoplamp continues to illuminate, REPAIR circuit CLS52 (BN) for a short to voltage. TEST the system for normal operation.

    • No  : GO to  R11.
  3. R3 CHECK THE STOPLAMP RELAY 
    • Ignition OFF.
    • Disconnect: Stoplamp Relay.
    • Ignition ON.

    Do the rear stoplamps continue to illuminate? 

    • Yes  : REPAIR circuit CLS43 (YE/GN) for a short to voltage. TEST the system for normal operation.
    • No  : INSTALL a new stoplamp relay. TEST the system for normal operation.
  4. R4 CHECK THE STOPLAMP SWITCH 
    • Disconnect: Stoplamp Switch C2064  .

    Do the stoplamps continue to illuminate? 

    • Yes  : If the vehicle is equipped with IA, GO to R5  .

      If the vehicle is not equipped with IA, GO to  R6.

    • No  : INSTALL a new stoplamp switch. REFER to STOPLAMP SWITCH . TEST the system for normal operation.
  5. R5 CHECK THE RFA MODULE 
    • Disconnect: RFA  Module C2153C  .
    • Ignition ON.

    Do the stoplamps continue to illuminate? 

    • Yes  : GO to R6  .
    • No  : GO to  R9.
  6. R6 CHECK THE PCM 
    • Ignition OFF.
    • Disconnect: PCM C175B  (3.5L/3.7L) or C1381B  (2.0L GTDI  ).
    • Ignition ON.

    Do the stoplamps continue to illuminate? 

    • Yes  : GO to R7  .
    • No  : GO to  R10.
  7. R7 CHECK THE BCM STOPLAMP SWITCH INPUT CIRCUIT FOR A SHORT TO VOLTAGE 
    • Ignition OFF.
    • Disconnect: BCM C2280B  .
    • Ignition ON.
    • Measure the voltage between the BCM C2280B-28  , circuit CCB08 (VT/WH), harness side and ground.
      Fig 1: Measuring Voltage Between BCM C2280B-28, Circuit CCB08 (VT/WH), Harness Side And Ground
      G07399345Courtesy of FORD MOTOR CO.

    Is any voltage present? 

    • Yes  : REPAIR circuit CCB08 (VT/WH) for a short to voltage. TEST the system for normal operation.
    • No  : For Edge, GO to R8  .

      For MKX, GO to  R11.

  8. R8 CHECK THE BCM STOPLAMP OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE 
    • Ignition OFF.
    • Disconnect: BCM C2280D  .
    • Ignition ON.

    Do the stoplamps continue to illuminate? 

    • Yes  : REPAIR circuit CLS52 (BN) for a short to voltage. TEST the system for normal operation.
    • No  : GO to  R11.
  9. R9 CHECK FOR CORRECT RFA MODULE OPERATION 
    • Disconnect all the RFA  module connectors.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect all the RFA  module connectors and make sure they seat correctly.
    • Operate the system and verify the concern is still present.

    Is the concern still present? 

    • Yes  : INSTALL a new RFA  module. REFER to MULTIFUNCTION ELECTRONIC MODULES . TEST the system for normal operation.
    • No  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
  10. R10 CHECK FOR CORRECT PCM OPERATION 
    • Disconnect all the PCM connectors.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect all the PCM connectors and make sure they seat correctly.
    • Operate the system and verify the concern is still present.

    Is the concern still present? 

    • Yes  : INSTALL a new PCM. REFER to ELECTRONIC ENGINE CONTROLS . TEST the system for normal operation.
    • No  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
  11. R11 CHECK FOR CORRECT BCM OPERATION 
    • Disconnect all the BCM  connectors.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect all the BCM  connectors and make sure they seat correctly.
    • Operate the system and verify the concern is still present.

    Is the concern still present? 

    • Yes  : INSTALL a new BCM  . REFER to MULTIFUNCTION ELECTRONIC MODULES . TEST the system for normal operation.
    • No  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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