Circuit/System Description
WARNING: This page is about a different car, the 2007 Pontiac Torrent and 2007 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.
The vehicle communication interface module (VCIM) detects the Back-up Battery (BUB) is no longer able to meet the minimum requirements to successfully place a call in the event of a main battery disconnect during a collision event.