Principles of Operation
WARNING: This page is about a different car, the 2014 Lincoln MKX and 2014 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.
The Front Lighting Control Module (FLM) monitors the fog lamp switch and sends a message over the High Speed Controller Area Network (HS-CAN) to the Body Control Module (BCM) to indicate the fog lamp request.
The fog lamps can be turned on when the following conditions are met:
- the ignition is in RUN
- the low beam headlamps or the parking lamps are on
- the high beams are off
When the BCM receives an input from the FLM 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.