Pinpoint Test Ac: The Trailer Lamps Are Inoperative - Trailer Reversing Lamps
WARNING: This page is about a different car, the 2005 Ford Pickup, 2005 Ford F550 Super Duty, 2005 Ford F450 Super Duty, and 2005 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
- AC1 CHECK LIGHTING OPERATION
- Key in OFF position.
- Disconnect: Trailer Tow C4098 (4-pin).
- Disconnect: Trailer Tow C4099 (7-pin).
- Disconnect the trailer from the vehicle.
- Check the operation of the vehicle exterior lighting systems for any concerns.
- Does the exterior lighting system of the vehicle operate correctly?
- Yes : GO to AC2.
- No : REPAIR any vehicle exterior lighting concerns. TEST the system for normal operation.
- AC2 CHECK CIRCUIT 963 (BK/LG) FOR POWER
- Apply the parking brake.
- Key in ON position.
- Select REVERSE.
- If M/T, place the transmission in REVERSE.
- Measure the voltage between trailer tow C4099-7, circuit 963 (BK/LG), harness side and ground.
- Is the voltage greater than 10 volts?
- Yes : Vehicle is operating correctly. SEND the trailer to an authorized camper/trailer repair center.
- No : GO to AC3.
- AC3 CHECK CIRCUIT 963 (BK/LG) FOR AN OPEN
- Key in OFF position.
- Disconnect: Central Junction Box (CJB) C270j.
- Key in ON position.
- Measure the voltage between CJB C270j-7, circuit 963 (BK/LG), (component side) and ground.
- Is the voltage greater than 10 volts?
- Yes : REPAIR the circuit. TEST the system for normal operation.
- No : INSTALL a new CJB. TEST the system for normal operation.