Pinpoint Test Z: The Trailer Lamps Are Inoperative - Trailer Parking Lamps
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.
- Z1 CHECK CIRCUIT 962 (BN/WH) FOR VOLTAGE
- Disconnect: Trailer Tow C4098 (4-Pin)
- Disconnect: Trailer Tow C4099 (7-Pin)
- Place the headlamp switch in the PARKING LAMPS ON position.
- Measure the voltage between the trailer tow C4098-3, circuit 962 (BN/WH) (4-pin connector), harness side and ground; or between the trailer tow C4099-6, circuit 962 (BN/WH) (7-pin connector), harness side and ground.
- Is the voltage greater than 10 volts?
- YES : The vehicle is operating correctly. SEND the trailer to an authorized camper/trailer repair facility.
- NO : Go to Z2.
- Z2 CHECK CIRCUIT 962 (BN/WH) FOR AN OPEN
- Place the headlamp switch in the OFF position.
- Disconnect: CJB C270j
- Place the headlamp switch in the PARKING LAMPS ON position.
- Measure the voltage between the CJB C270j pin 15, component side and ground.
- Is the voltage greater than 10 volts?
- YES : REPAIR the circuit. TEST the system for normal operation.
- NO : VERIFY the CJB fuse 38 (20A) is OK. If OK, INSTALL a new CJB. TEST the system for normal operation.