Trailer Parking Lamps
WARNING: This page is about a different car, the 2013 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
The BJB supplies voltage at all times to the trailer tow parking lamp relay. The vehicle rear parking lamp output circuit from the BCM is spliced to provide voltage to the trailer tow parking lamp relay coil to correspond with the parking lamp function of the vehicle.