Instrument Panel Cluster (IPC)
WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
The IPC provides a means of customer notification in case of a failure and a voltmeter. There are 2 means of notification, a charge indicator and a driver information center (DIC) message of BATTERY NOT CHARGING SERVICE CHARGING SYSTEM and SERVICE BATTERY CHARGING SYSTEM.