Trailer Parking Lamps
WARNING: This page is about a different car, the 2017 Lincoln Navigator and 2017 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.
When the BCM receives an input requesting the parking lamps on, the BCM provides voltage to the trailer tow parking lamps relay coil. Once the trailer tow parking lamps relay coil is energized, the relay supplies voltage to the trailer tow connector for trailer parking lamps.