Pinpoint Test Ab: The Trailer Lamps Are On Continuously
WARNING: This page is about a different car, the 2010 Mercury Mariner and 2010 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
- AB1 CHECK FOR VOLTAGE AT THE TRAILER TOW CONNECTOR
- Ignition OFF.
- Disconnect: Trailer Tow C439.
- Ignition ON.
- Measure the voltage the between trailer tow connector, harness side and ground as follows:CONNECTOR-PIN REFERENCE CHART
Connector-Pin Circuit C439-2 CAT06 (YE) C439-1 CAT09 (GN) C439-3 CAT11 (BN) - Is any voltage present?
- Yes: GO to AB2 .
- No: The vehicle is operating correctly. SEND the trailer to an authorized camper/trailer repair facility.
- AB2 CHECK THE SUSPECT RELAY
- Ignition OFF.
- Disconnect: Suspect Trailer Tow Relay.
- Ignition ON.
- Measure the voltage the between trailer tow connector, harness side and ground as follows:CONNECTOR-PIN REFERENCE CHART
Connector-Pin Circuit C439-2 CAT06 (YE) C439-1 CAT09 (GN) C439-3 CAT11 (BN) - Is any voltage present?
- 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.
- No: INSTALL a new turn trailer tow relay. TEST the system for normal operation.