Circuit/System Description

WARNING: This page is about a different car, the 2016 GMC Acadia, 2016 Chevrolet Traverse, and 2016 Buick Enclave. However, it is still accessible from the selected car via links, so may be relevant.

The driver door lock/window switch and passenger door lock/window switch each provides a 12V signal to their respective door ajar switches located within the door latch assembly. These switches are open when the door is closed and the voltage within the signal circuit will be at 12V. When a door is open, the contacts within the ajar switch close providing a ground path for the signal circuit dropping the voltage to 0. The door lock/widow switch will detect the drop in voltage and will send a serial data message to the BCM indicating the status of the door. When the ignition is ON, the BCM will then send a signal to the driver information center to display the DOOR AJAR message

The BCM provides 12V signal to each a ajar switch located within their respective door latch assemblies. These switches are open when the door is closed and the voltage within the signal circuit will be at 12V. When a door is open, the contacts within the ajar switch close providing a ground path for the signal circuit dropping the voltage to 0. The BCM will detect the drop in voltage and when the ignition is ON, the BCM will then send a signal to the driver information center to display the DOOR AJAR message