Indicator Lights: Battery
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 1999 Oldsmobile Bravada, 1999 GMC Sonoma, 1999 GMC Jimmy, 1999 GMC Envoy, and 1999 Chevrolet S10 Pickup. However, it is still accessible from the selected car via links, so may be relevant.
Light Emitting Diode (LED) is controlled by Instrument Panel Cluster (IPC), using Class 2 serial data information sent by Vehicle Control Module/Powertrain Control Module (VCM/PCM). LED will remain on while ignition is turned on, engine is started and for 3 seconds after key is released to run. If generator is charging, VCM/PCM will command LED off.