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Home >> Buick >> 2007 >> Allure CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 19 (Lighting Systems) >> Diagnostic Information and Procedures >> Front Fog Lamps Malfunction >> Circuit/System Description

Circuit/System Description

WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.

The vehicle fog lamps are controlled by the body control module (BCM) based on an input from the fog lamp switch. The fog lamp switch is a momentary switch integrated with the headlamp switch. When activated, the fog lamp switch provides a momentary ground to the BCM via the front fog lamp switch signal circuit, indicating the fog lamps are requested ON.

The BCM controls the fog lamps based on the inputs explained above. When a fog lamp request is received, the BCM grounds the fog lamp relay control circuit. This energizes the FOG LP relay. With the relay energized, B+ is applied to both fog lamps.

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