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Pinpoint Test K: The STOPLAMPS Are On Continuously

WARNING: This page is about a different car, the 2006 Mercury Montego, 2006 Ford Freestyle, and 2006 Ford Five Hundred. However, it is still accessible from the selected car via links, so may be relevant.
  1. K1 CHECK THE STOPLAMP SWITCH INPUT 
    • Key in ON position.
    • Enter the following diagnostic mode on the scan tool: SJB Stoplamp Switch PID.
    • Monitor the SJB stoplamp switch PID.
    • Does the PID indicate active with the brake pedal not applied? 

    Yes:  GO to  K2.

    No:  GO to  K6.

  2. K2 CHECK THE STOPLAMP SWITCH 
    • Key in OFF position.
    • Disconnect: Stoplamp Switch C278.
    • Do the stoplamps continue to illuminate? 

    Yes:  GO to  K3.

    No:  INSTALL a new stoplamp switch. REFER to STOPLAMP SWITCH . TEST the system for normal operation.

  3. K3 CHECK THE BRAKE SHIFT INTERLOCK 
    • Disconnect: Selector Lever C3245.
    • Do the stoplamps continue to illuminate? 

    Yes:  GO to  K4.

    No:  INSTALL a new selector lever. REFER to INSTALLATION . TEST the system for normal operation.

  4. K4 CHECK THE ABS MODULE 
    • Disconnect: ABS Module C135.
    • Do the stoplamps continue to illuminate? 

    Yes:  GO to  K5.

    No:  GO to  K2.

  5. K5 CHECK CIRCUIT 810 (RD/LG) FOR A SHORT TO VOLTAGE 
    • Disconnect: SJB C2280a.
    • Measure the voltage between the stoplamp switch C278-1, circuit 810 (RD/LG), harness side and ground.
      Fig 1: Measuring Voltage Between Stoplamp Switch C278-1, Circuit 810 (RD/LG), Harness Side & Ground
      G04658314Courtesy of FORD MOTOR CO.
    • Is any voltage present? 

    Yes:  REPAIR the circuit. TEST the system for normal operation.

    No:  GO to  K7.

  6. K6 CHECK STOPLAMP VOLTAGE CIRCUIT FOR A SHORT TO VOLTAGE 
    • Key in OFF position.
    • Disconnect: SJB C2280e.
    • Does a rear lamp continue to illuminate? 

    Yes:  For all stoplamps on Montego, REPAIR circuit 1374 (TN/LB). TEST the system for normal operation.

    For the high mounted stoplamp on Freestyle or Five Hundred, REPAIR circuit 1374 (TN/LB). TEST the system for normal operation.

    For the LH rear stoplamp on Freestyle or Five Hundred, REPAIR circuit 1363 (WH/RD). TEST the system for normal operation.

    For the RH rear stoplamp on Freestyle or Five Hundred, REPAIR circuit 1365 (GY/LB). TEST the system for normal operation.

    No:  GO to  K7.

  7. K7 CHECK FOR CORRECT SJB OPERATION 
    • Disconnect all the SJB connectors.
    • Check for:
      • corrosion
      • pushed-out pins
    • Connect all the SJB 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 SJB. REFER to REMOVAL AND INSTALLATION . 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.

  8. K8 CHECK FOR CORRECT ABS MODULE OPERATION 
    • Disconnect the ABS module connector.
    • Check for:
      • corrosion
      • pushed-out pins
    • Connect the ABS module connector and make sure it seats correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 

    Yes:  INSTALL a new ABS module. REFER to REMOVAL AND INSTALLATION . 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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