Delay Locking (Utility Vehicles)
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2002 GMC Yukon XL, 2002 GMC Yukon, 2002 Chevrolet Tahoe, 2002 Chevrolet Suburban, and 2002 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
This feature allows the operator to lock all the doors from the rear lock switch. The rear cargo doors have contact plates that complete the power door lock and unlock fuse supply circuits (among others) when the cargo doors are closed, and interrupt these circuits when the cargo doors are open. When a lock function occurs and the BCM senses an active state on the lift gate ajar switch signal circuit (door open), the driver and passengers doors will lock as described, and the BCM continues to monitor the lift gate ajar switch signal circuit. When the BCM senses an inactive state (door closed), the BCM will cycle the door lock relay again after approximately 5 seconds to perform another lock function, thus locking the cargo door.