Liftgate Ajar
WARNING: This page is about a different car, the 2015 Chevrolet Trax and 2015 Buick Encore. However, it is still accessible from the selected car via links, so may be relevant.
The body control module provides a 12 V signal to the liftgate ajar signal circuit. The liftgate latch contains an ajar switch which is normally open when the liftgate is closed. When the liftgate is opened, the normally open ajar switch closes. With the ajar switch closed, ground is provided to the ajar switch signal circuit. The body control module detects the voltage drop and sends a serial data message to the instrument panel to display the door ajar indicator