Instrument Panel Cluster (IPC) Operation

Charge Indicator Operation 

The instrument panel cluster (IPC) illuminates the charge indicator and displays a warning message in the driver information center (DIC) when the one or more of the following occurs:

• The engine control module (ECM) detects system voltage less than 11 V or greater than 16 V. The IPC receives a GMLAN message from the ECM requesting illumination.
• The BCM determines that the system voltage is less than 11 V or greater than 16 V.
• The IPC receives a GMLAN message from the body control module (BCM) indicating there is a system voltage range concern.
• The IPC performs the displays test at the start of each ignition cycle. The indicator illuminates for approximately 3 seconds.
• The ignition is ON, with the engine OFF.

SERVICE BATTERY CHARGING SYSTEM 

The BCM and the ECM will send a GMLAN message to the DIC for the SERVICE BATTERY CHARGING SYSTEM message to be displayed. It is displayed whenever the charge indicator is commanded ON due to a failure.