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Pinpoint Test O: The STOPLAMPS Are On Continuously

WARNING: This page is about a different car, the 2005 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.
  1. O1 DETERMINE THE ALWAYS ON STOPLAMPS 
    • Observe the stoplamps.
    • Are all the stoplamps illuminated? 
    • Yes  : GO to  O3.
    • No  : GO to  O2.
  2. O2 CHECK THE CONTROL GROUND CIRCUIT FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: REM C420e.
    • Does the lamp continue to illuminate? 
    • Yes  : For the high-mounted stoplamp, REPAIR circuit 31S-LG6 (BK/YE) or 31S-LG6A (BK/YE) as necessary. TEST the system for normal operation. For the LH stoplamp, REPAIR circuit 31S-LG14 (BK/OG). TEST the system for normal operation.

      For the RH stoplamp, REPAIR circuit 31S-LG21 (BK/GN) or 31S-LG14 (BK/OG) as necessary. TEST the system for normal operation.

    • No  : GO to  O10.
  3. O3 CHECK THE BPP SWITCH 
    • Key in OFF position.
    • Disconnect: BPP Switch C278.
    • Do the stoplamps continue to illuminate? 
    • Yes  : If equipped with IVD, GO to  O4.

      If not equipped with IVD, GO to  O6.

    • No  : INSTALL a new BPP switch. REFER to STOPLAMP SWITCH  in this article. TEST the system for normal operation.
  4. O4 CHECK THE IVD MODULE 
    • Disconnect: IVD Module C155.
    • Do the stoplamps continue to illuminate? 
    • Yes  : GO to  O6.
    • No  : GO to  O5.
  5. O5 CHECK CIRCUIT 29S-CF1 (OG/YE) FOR A SHORT TO POWER 
    • Measure the voltage between BPP switch C278-2, circuit 29S-CF1 (OG/YE), harness side and ground.
      Fig 1: Measuring Voltage Between BPP Switch C278-2, Circuit 29S-CF1 (OG/YE) And Ground
      G03998620Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    • Yes  : REPAIR the circuit. CLEAR the DTCs. TEST the system for normal operation.
    • No  : GO to 011.
  6. O6 CHECK THE ABS MODULE 
    • Disconnect: ABS Module C135.
    • Do the stoplamps continue to illuminate? 
    • Yes  : GO to  O7.
    • No  : GO to 012.
  7. O7 CHECK THE ELECTRIC PARKING BRAKE MODULE 
    • Disconnect: Electric Parking Brake Module C4206.
    • Do the stoplamps continue to illuminate? 
    • Yes  : GO to  O8.
    • No  : GO to 013.
  8. O8 CHECK THE PCM 
    • Disconnect: PCM C175a.
    • Do the stoplamps continue to illuminate? 
    • Yes  : GO to  O9.
    • No  : GO to 014.
  9. O9 CHECK THE REM 
    • Disconnect: REM C420b.
    • Do the stoplamps continue to illuminate? 
    • Yes  : REPAIR circuit 29S-DK30 (OG), 29S-CF1 (OG/YE), 29S-CF2 (OG/BU), 29S-CF58 (OG/GN) or 29S-RE13 (OG) as necessary. CLEAR the DTCs. TEST the system for normal operation.
    • No  : GO to 010.
  10. O10 CHECK REM OPERATION 
    • Key in OFF position.
    • Disconnect all REM connectors.
    • Check for:
      • corrosion
      • pushed-out pins
    • Connect all REM 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 REM. REFER to MULTIFUNCTION ELECTRONIC MODULES . TEST the system for normal operation.
    • No  : The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. REPEAT the self-test.
  11. O11 CHECK IVD MODULE OPERATION 
    • Key in OFF position.
    • Disconnect all IVD module connectors.
    • Check for:
      • corrosion
      • pushed-out pins
    • Connect all IVD 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 IVD module. REFER to ANTI-LOCK CONTROL . TEST the system for normal operation.
    • No  : The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. REPEAT the self-test.
  12. O12 CHECK ABS MODULE OPERATION 
    • Key in OFF position.
    • Disconnect all ABS module connectors.
    • Check for:
      • corrosion
      • pushed-out pins
    • Connect all ABS 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 ABS module. REFER to ANTI-LOCK CONTROL . TEST the system for normal operation.
    • No  : The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. REPEAT the self-test.
  13. O13 CHECK ELECTRIC PARKING BRAKE MODULE OPERATION 
    • Key in OFF position.
    • Disconnect all electric parking brake module connectors.
    • Check for:
      • corrosion
      • pushed-out pins
    • Connect all electric parking brake 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 electric parking brake module. REFER to PARKING BRAKE & ACTUATION . TEST the system for normal operation.
    • No  : The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. REPEAT the self-test.
  14. O14 CHECK PCM OPERATION 
    • Key in OFF position.
    • Disconnect all PCM connectors.
    • Check for:
      • corrosion
      • pushed-out pins
    • Connect all 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. Concern may have been caused by a loose or corroded connector. REPEAT the self-test.
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