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Pinpoint Test S: The Trailer Lamps Are Inoperative

WARNING: This page is about a different car, the 2004 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.
  1. S1 CHECK TRAILER TOW GROUND 
    • Measure the resistance between the trailer tow C439 pin 1, circuit 206 (WH), harness side and ground.
      Fig 1: Checking Trailer Tow Ground
      G03277223Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes  : The vehicle is operating correctly. SEND the trailer to an authorized camper/trailer repair center for repair.
    2. No  : REPAIR circuit 206 (WH) and 57 (BK) as necessary. TEST the system for normal operation.
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