Circuit Description
WARNING: This page is about a different car, the 2003 Pontiac Aztek and 2003 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
The body control module (BCM) uses the ambient light sensor signal in order to control the daytime running lamps system. The ambient light sensor is connected directly to the BCM through the signal circuit and the reference circuit of the ambient light sensor.