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Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1928 (Exterior Lighting System (F250-F550)) >> Diagnostic Tests >> Trailer Lamps >> Pinpoint Tests >> Pinpoint Test AB: The Trailer Lamps Are On Continuously >> Pinpoint Test Ab: The Trailer Lamps Are On Continuously

Pinpoint Test Ab: The Trailer Lamps Are On Continuously

WARNING: This page is about a different car, the 2007 Ford Pickup, 2007 Ford F550 Super Duty, 2007 Ford F450 Super Duty, and 2007 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Use the correct probe adaptor(s) when making measurements. Failure to use the correct probe adaptor(s) may damage the connector.
  1. AB1 CHECK FOR VOLTAGE AT THE TRAILER TOW CONNECTOR 
    • Key in OFF position.
    • Disconnect: Trailer Tow C4098 (4-Pin)
    • Disconnect: Trailer Tow C4099 (7-Pin)
    • Key in ON position.
      • Fig 1: Checking Circuit For Voltage
      GF0008341Courtesy of FORD MOTOR CO.
    • Measure the voltage the between trailer tow (4-pin connector), harness side and ground; or between the trailer tow (7-pin connector), harness side and ground as follows:
      Trailer Tow Connector Connector-Pin Circuit
      4-pin
      7-pin      		 C4098-2
      C4099-1      		 52 (YE)
      4-pin
      7-pin      		 C4098-1
      C4099-4      		 64 (DG)
      4-pin
      7-pin      		 C4098-3
      C4099-6      		 962 (BN/WH)
      7-pin C4099-7 963 (BK/LG)
    • Is any voltage present? 
    1. YES  : If the trailer parking lamps are on continuously, go to  AB2 .

      If the trailer LH or RH turn lamps are on continuously, go to  AB3 .

    2. NO  : The vehicle is operating correctly. SEND the trailer to an authorized camper/trailer repair facility.
  2. AB2 CHECK THE CJB 
    • Key in OFF position.
    • Disconnect: CJB C270j
    • Connect: Trailer Tow C4098 (4-Pin)
    • Connect: Trailer Tow C4099 (7-Pin)
    • Key in ON position.
    • Do the trailer lamps continue to illuminate? 
    1. YES  : REPAIR circuit 962 (BN/WH). TEST the system for normal operation.
    2. NO  : INSTALL a new CJB. TEST the system for normal operation.
  3. AB3 CHECK THE SUSPECT RELAY 
    • Key in OFF position.
    • Disconnect: Suspect Trailer Turn Relay
    • Carry out the component test for the trailer tow turn relay. Refer to COMPONENT TESTING article.
    • Is the trailer tow relay OK? 
    1. YES  : REPAIR circuit 52 (YE) (LH turn) or circuit 64 (DG) (RH turn) as necessary. TEST the system for normal operation.
    2. NO  : INSTALL a new LH or RH turn trailer tow relay. TEST the system for normal operation.
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