Circuit Description
WARNING: This page is about a different car, the 2002 GMC Safari and 2002 Chevrolet Astro. However, it is still accessible from the selected car via links, so may be relevant.
The body control module (BCM) monitors the voltage on the Interior park lamps fused supply voltage circuit in order to determine the actual state of the park lamp relay. The BCM also uses the park lamp relay control circuit in order to energize the park lamp relay.