Pinpoint Test O: The Trailer Lamps Are On Continuously
WARNING: This page is about a different car, the 2005 Ford RV Cutaway, 2005 Ford Econoline, 2005 Ford E450 Super Duty, and 2005 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
- O1 CHECK FOR VOLTAGE TO THE TRAILER TOW MODULE
- Key in OFF position.
- Disconnect: Trailer Tow C4098 (4-pin).
- Disconnect: Trailer Tow C4099 (7-pin).
- Measure the voltage between the trailer tow connector and ground as follows:PIN SPECIFICATION
Trailer Tow Connector Pin Circuit C4098 (4-pin) 2 (parking lamps) 962 (BN/WH) C4098 (4-pin) 3 (LH stoplamp) 52 (YE) C4098 (4-pin) 4 (RH stoplamp) 64 (DG) C4099 (7-pin) 1 (reversing lamps) 963 (BK/LG) C4099 (7-pin) 3 (RH stoplamp) 64 (DG) C4099 (7-pin) 6 (LH stoplamp) 52 (YE) C4099 (7-pin) 7 (parking lamps) 962 (BN/WH) - Is any voltage present?
- Yes : GO to O2.
- No : The vehicle is operating correctly. SEND the trailer to an authorized camper/trailer repair center.
- O2 CHECK THE TRAILER TOW RELAY
- Disconnect: Suspect Trailer Tow Relay.
- Measure the voltage between the trailer tow connector and ground as follows:PIN SPECIFICATION
Trailer Tow Connector Pin Circuit C4098 (4-pin) 2 (parking lamps) 962 (BN/WH) C4098 (4-pin) 3 (LH stoplamp) 52 (YE) C4098 (4-pin) 4 (RH stoplamp) 64 (DG) C4099 (7-pin) 1 (reversing lamps) 963 (BK/LG) C4099 (7-pin) 3 (RH stoplamp) 64 (DG) C4099 (7-pin) 6 (LH stoplamp) 52 (YE) C4099 (7-pin) 7 (parking lamps) 962 (BN/WH) - Is any voltage present?
- Yes : REPAIR the circuit in question. TEST the system for normal operation.
- No : INSTALL a new trailer tow relay. TEST the system for normal operation.