Charge Indicator Operation: Notes

The instrument panel cluster (IPC) illuminates the charge indicator in the message center when the one or more of the following occurs:

IMPORTANT: The generator battery control module is not set up to set a DTC if the battery voltage is too high or too low. Check with the ECM to see if they set a DTC when the battery voltage is too high or too low.

The IPC determines that the system voltage is less than 11 volts or greater than 16 volts. The IPC receives a class 2 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.
The generator battery control module determines there is a fault and sends a class 2 message to the IPC to illuminate the charge indicator.