Circuit Description
WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. However, it is still accessible from the selected car via links, so may be relevant.
When the body control module (BCM) receives a ground signal from the headlamp dimmer switch high beam signal circuit or flash-to-pass switch signal circuit requesting to illuminate the high beam headlamps, the BCM will energize the high beam relay by grounding the headlamp high beam relay control circuit.