Fog Lamps

WARNING: This page is about a different car, the 2003 Pontiac Montana, 2003 Oldsmobile Silhouette, and 2003 Chevrolet Venture. However, it is still accessible from the selected car via links, so may be relevant.

The PARK LP fuse and the FOG LP fuse supply battery voltage to the headlamp switch and the fog lamp relay contacts. When the headlamp switch is in HEAD or PARK and the driver presses the fog lamp switch, voltage is applied to the fog lamp relay coil. The fog lamp relay coil is grounded through the high beam headlamp filaments. The relay energizes and applies voltage to the fog lamps through the fog lamps supply voltage circuit. Because the coil of the FOG LAMP relay is grounded through the high beam filaments, the relay will de-energize any time the high beams are ON. The fog lamps can also be activated with the headlamp switch OFF, during automatic headlamp operation. When the automatic headlamps are on, the DRL control module applies voltage to the fog lamp switch and to the exterior lights.