Trailer Tow
WARNING: This page is about a different car, the 2012 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
The Battery Junction Box (BJB) supplies voltage to the trailer tow stop/turn, parking and reversing lamps. When the vehicle's rear stop/turn, parking lamps or reversing are illuminated, voltage is supplied to a corresponding trailer tow relay located in the BJB.
The trailer tow battery charge relay provides voltage to the trailer tow connector when the ignition switch is in run.
The vehicle can be equipped with a factory manufactured Trailer Brake Control (TBC) module. For diagnostic information, REFER to AUXILIARY BRAKE SYSTEM -- F-150 .
On vehicles not equipped with a factory manufactured TBC module, the vehicle comes equipped with circuitry to support an aftermarket TBC module.