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Pinpoint Test K: The STOPLAMPS Are On Continuously

WARNING: This page is about a different car, the 2010 Mercury Mariner and 2010 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
  1. K1 DETERMINE IF ALL THE STOPLAMPS ARE ILLUMINATED 
    • Ignition OFF.
    • Observe the stoplamps with the brake pedal released.
    • Are all of the stoplamps illuminated? 
    • Yes:  GO to  K3.
    • No:  GO to K2  .
  2. K2 CHECK THE STOPLAMPS VOLTAGE SUPPLY CIRCUIT FOR A SHORT TO VOLTAGE 
    • Disconnect: SJB  C2280d.
    • Do the stoplamps 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.

    • No:  GO to  K7.
  3. K3 CHECK THE STOPLAMP SWITCH 
    • Disconnect: Stoplamp Switch C278.
    • Do the stoplamps continue to illuminate? 
    • Yes:  GO to K4  .
    • No:  INSTALL a new stoplamp switch. REFER to STOPLAMP SWITCH . TEST the system for normal operation.
  4. K4 CHECK THE PCM 
    • Disconnect: PCM C175b.
    • Do the stoplamps continue to illuminate? 
    • Yes:  GO to K5  .
    • No:  GO to  K6.
  5. K5 CHECK THE STOPLAMP SWITCH OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE 
    • Disconnect: SJB  C2280b.
    • Does the high mounted stoplamp continue to illuminate? 
    • Yes:  REPAIR circuit CCB08 (VT/WH) for a short to voltage. TEST the system for normal operation.
    • No:  GO to  K7.
  6. K6 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? 
  7. K7 CHECK FOR CORRECT SJB OPERATION 
    • Disconnect all the SJB  connectors.
    • Check for:
      • corrosion
      • damaged pins
      • 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 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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