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Home >> Ford >> 2009 >> Flex Limited, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1112 (Exterior Lighting System) >> Diagnostic Tests >> Trailer Lamps >> Pinpoint Tests >> Pinpoint Test AA: The Trailer Lamps Are On Continuously >> Pinpoint Test Aa: The Trailer Lamps Are On Continuously

Pinpoint Test Aa: The Trailer Lamps Are On Continuously

WARNING: This page is about a different car, the 2007 Lincoln MKX and 2007 Ford Edge. 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. AA1 CHECK FOR VOLTAGE AT THE TRAILER TOW CONNECTOR 
    • Key in ON position.
    • Measure the voltage the between trailer tow connector, harness side and ground as follows:
      Connector-Pin Circuit
      C439-2 CAT06 (YE)
      C439-1 CAT09 (GN)
      C439-3 CAT11 (BN)
    • Is any voltage present? 
    1. YES  : Go to  AA2.
    2. NO  : The vehicle is operating correctly. SEND the trailer to an authorized camper/trailer repair facility.
  2. AA2 CHECK THE SUSPECT RELAY 
    • Key in OFF position.
    • Disconnect: Suspect Trailer Tow Relay
    • Measure the voltage the between trailer tow connector, harness side and ground as follows:
      Connector-Pin Circuit
      C439-2 CAT06 (YE)
      C439-1 CAT09 (GN)
      C439-3 CAT11 (BN)
    • Is any voltage present? 
    1. YES  : REPAIR circuit CAT06 (YE) (LH turn), circuit CAT09 (GN) (RH turn), or circuit CAT11 (BN) (parking lamps) for a short to voltage. TEST the system for normal operation.
    2. NO  : INSTALL a new trailer tow relay in question. TEST the system for normal operation.
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