Driver In Vehicle Detection
WARNING: This page is about a different car, the 2000 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
By using the ignition switch and door ajar inputs, BCM can detect if driver has left the vehicle. If ignition is turned off and no door ajar status is detected, BCM assumes that driver is in vehicle. As soon as BCM receives a door ajar signal, it will assume that driver has left vehicle. This information is used for Retained Accessory Power (RAP) functions.