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Pinpoint Test L: The STOPLAMPS Are On Continuously

WARNING: This page is about a different car, the 2010 Mercury Milan, 2010 Lincoln MKZ, and 2010 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
  1. L1 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  L3.
    • No:  GO to  L2.
  2. L2 CHECK THE SJB STOPLAMP OUTPUT 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. CLEAR the DTCs. REPEAT the self-test.

      If the RH rear lamp continues to illuminate, REPAIR circuit CLS19 (VT/OG) for a short to voltage. CLEAR the DTCs. REPEAT the self-test.

    • No:  GO to  L7.
  3. L3 CHECK THE STOPLAMP SWITCH 
    • Disconnect: Stoplamp Switch C278.
    • Do the stoplamps continue to illuminate? 
    • Yes:  GO to  L4.
    • No:  INSTALL a new stoplamp switch. REFER to Removal and Installation . CLEAR the DTCs. REPEAT the self-test.
  4. L4 CHECK THE PCM 
    • Disconnect: PCM C175b.
    • Do the stoplamps continue to illuminate? 
    • Yes:  GO to  L5.
    • No:  GO to  L6.
  5. L5 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. CLEAR the DTCs. REPEAT the self-test.
    • No:  GO to  L7.
  6. L6 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 INSTALLATION , INSTALLATION , INSTALLATION or 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. CLEAR the DTCs. REPEAT the self-test.
  7. L7 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 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. CLEAR the DTCs. REPEAT the self-test.
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