Fog/Driving Lamp: Description and Operation

Principles of Operation

Fog Lamps
The fog lamp system consists of the following:
^ fog lamps
^ fog lamp relay
^ flash-to-pass relay
^ headlamp switch

When the fog lamp switch is engaged, the high beams are not illuminated, and the Lighting Control Module (LCM) has commanded the exterior lamps on if the headlamp switch in the AUTO position, then the fog lamp relay is energized and power is supplied to the fog lamps. When the high beams are illuminated the flash-to-pass relay is energized, which opens the controlled power circuit to the fog lamp relay.