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Home >> Ford >> 2006 >> Focus ZX5 SE, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 715 (Exterior Lighting System) >> Diagnostic Tests >> Stoplamps >> Pinpoint Tests >> Pinpoint Test K: The Stoplamps Are On Continuously >> Pinpoint Test K: The STOPLAMPS Are On Continuously

Pinpoint Test K: The STOPLAMPS Are On Continuously

WARNING: This page is about a different car, the 2007 Lincoln Mark LT and 2007 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
  1. K1 CHECK THE STOPLAMP SWITCH OPERATION 
    • Disconnect: Stoplamp Switch C278
    • Do the stoplamps continue to illuminate? 
    1. YES  : Go to  K2.
    2. NO  : INSTALL a new stoplamp switch. REFER to Stoplamp Switch  in this article. TEST the system for normal operation.
  2. K2 CHECK THE PCM 
    • Disconnect: PCM C175b
    • Do the stoplamps continue to illuminate? 
    1. YES  : If equipped with a trailer brake control module, go to  K3.

      If not equipped with a trailer brake control module, go to  K4.

    2. NO  : Go to  K8.
  3. K3 CHECK THE TRAILER BRAKE CONTROL MODULE 
    • Disconnect: Trailer Brake Control Module C2026
    • Do the stoplamps continue to illuminate? 
    1. YES  : Go to  K4.
    2. NO  : INSTALL a new trailer brake control module. TEST the system for normal operation.
  4. K4 CHECK CIRCUIT 511 (LG) FOR A SHORT TO VOLTAGE 
    • Disconnect: Multifunction Switch C202c
    • Does any stoplamp continue to illuminate? 
    1. YES  : For high mounted stoplamp, REPAIR circuit 511 (LG). TEST the system for normal operation.

      For rear stoplamp, go to  K5.

    2. NO  : INSTALL a new multifunction switch. REFER to STEERING COLUMN SWITCHES article. TEST the system for normal operation.
  5. K5 CHECK THE CIRCUIT TO THE CJB 
    • Disconnect: CJB C270e
    • Does any stoplamp continue to illuminate? 
    1. YES  : Go to  K6.
    2. NO  : REPAIR circuit 9 (LG/OG) (LH stoplamp) or circuit 5 (OG/LB) (RH stoplamp) between the multifunction switch and the CJB as necessary. TEST the system for normal operation.
  6. K6 CHECK THE CIRCUIT TO THE REAR LAMP 
    • Disconnect: CJB C270j
    • Does any stoplamp continue to illuminate? 
    1. YES  : REPAIR circuit 9 (LG/OG) (LH stoplamp) or circuit 5 (OG/LB) (RH stoplamp) between the CJB and the rear lamp as necessary. TEST the system for normal operation.
    2. NO  : Go to  K7.
  7. K7 CHECK CIRCUIT 52 (YE) OR CIRCUIT 64 (DG) FOR A SHORT TO VOLTAGE 
    • Disconnect: CJB C270k
    • Measure the voltage between the CJB C270k-2, circuit 52 (YE) (LH rear lamp), harness side and ground; or between the CJB C270j-16, circuit 64 (DG) (RH rear lamp), harness side and ground
      • Fig 1: Checking Circuit 52 (YE) Or Circuit 64 (DG) For Short To Voltage
      GF0004600Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    1. YES  : REPAIR the circuit in question. TEST the system for normal operation.
    2. NO  : REPAIR or INSTALL a new CJB. TEST the system for normal operation.
  8. K8 CHECK FOR 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? 
    1. YES  : INSTALL a new PCM. REFER to ELECTRONIC ENGINE CONTROLS article. TEST the system for normal operation.
    2. 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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