Door Ajar Indicator Description and Operation
WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. However, it is still accessible from the selected car via links, so may be relevant.
The instrument panel cluster (IPC) illuminates the door ajar indicator in the message center when the door ajar switch closes sending a low input to the IPC.