Circuit/System Description
WARNING: This page is about a different car, the 2019 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.
The Control Module monitors the B+ circuit and ignition circuit voltage if applicable to ensure that they stay within the proper range. An open or high resistance on ground circuit may affect the modules ability to monitor and report the correct system voltage. The modules have various circuit numbers for the powers, grounds, and ignition circuits.