Operation CHARM: Car repair manuals for everyone.

Front Fog Lamps

The front fog lamps are a controlled by the BCM. If the park lamps are ON, the high beams are OFF and the fog lamp switch is pressed, the BCM will command the fog lamp relay ON. When the BCM senses a momentary low signal on the fog lamp switch circuit, the fog lamps will turn OFF. Toggle the HIGH/LOW beam switch and the front fog lamps will toggle ON/OFF.