Circuit Description
WARNING: This page is about a different car, the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
The BCM interfaces with the vehicle's power distribution system through the RAP#1 relay. The RAP#1 relay allows the BCM to control the application of power to the feed accessory circuits.
When the ignition switch turns from ON/RUN to LOCK or OFF, with all of the vehicle doors closed, the BCM leaves the RAP#1 relay energized for 20 minutes, or until any vehicle door opens and the BCM detects a ground signal in one of the door ajar circuits.