Fog Lamps

WARNING: This page is about a different car, the 2006 Buick LaCrosse and 2006 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.

The FOG LPS fuse in the underhood fuse block supplies battery positive voltage to both the coil and switch side of the FOG LP Relay. When the fog lamp switch is placed in the ON position, ground is applied from G202 through the fog lamp switch to the body control module (BCM). The BCM then applies a ground to the fog lamp relay control circuit. This energizes the FOG LP relay and applies battery positive voltage through the fog lamp voltage supply circuit to the left and right fog lamps. Ground is applied at all times to the left fog lamp from G101 and to the right fog lamp from G100. The park lamps are headlamps must be ON in order for the fog lamps to illuminate. Fog lamp operation will be cancelled whenever the park lamps are turned OFF or the high beams are turned ON. When the park lamps are turned ON, the BCM sends a class 2 message to the instrument panel cluster (IPC) to illuminate the fog lamp indicator.