Fog 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.
The SCCM monitors the fog lamp switch and sends a headlamp switch status message over the communication network to the BCM to indicate the fog lamp request.
When the BCM receives a Headlamp switch status message over the HS-CAN from the SCCM indicating a request for the fog lamps, the BCM provides ground to the fog lamp relay (integrated into the BCM). When the fog lamp relay is energized, voltage is routed to the fog lamps.