Pinpoint Test Y: The Trailer Lamps Are On Continuously
WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 Ford Escape. 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.
- Y1 CHECK THE CIRCUITRY FOR SHORTS TO VOLTAGE
- Key in OFF position.
- Disconnect: Trailer Tow C439
- Key in ON position.
- Measure the voltage between the trailer tow connector, harness side and ground as follows:
Connector-Pin Circuit C439-1 64 (DG) C439-2 52 (YE) C439-3 962 (BN/WH) - Is any voltage present?
- YES : Go to Y2.
- NO : The vehicle is operating correctly. SEND the trailer to an authorized camper/trailer repair center.
- Y2 CHECK THE SJB
- Key in OFF position.
- Disconnect: SJB C2280c
- Key in ON position.
- Measure the voltage between the trailer tow connector, harness side and ground as follows:
Connector-Pin Circuit C439-1 64 (DG) C439-2 52 (YE) C439-3 962 (BN/WH) - Is any voltage present?
- YES : REPAIR the circuit in question. TEST the system for normal operation.
- NO : Go to Y3.
- Y3 CHECK FOR CORRECT SJB OPERATION
- Disconnect all the SJB connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the SJB connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
- YES : INSTALL a new SJB. REFER to MULTIFUNCTION ELECTRONIC MODULES article. TEST the system for normal operation.
- NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.