See also:

How OnStar Service Works
Automatic Crash Response, Emergency Services, Crisis Assist, Stolen Vehicle Assistance, Vehicle Diagnostics, Remote Door Unlock, Roadside Assistance, Turn-by-Turn Navigation, and Hands-Free ...

Battery Voltage and Charging Messages
BATTERY SAVER ACTIVE This message displays when the vehicle has detected that the battery voltage is dropping beyond a reasonable point. The battery saver system starts reducing certain features ...

Sensors
The solar sensor located on the instrument panel, near the windshield, monitors the solar heat. The interior temperature sensor, located on the instrument panel to the right of the steeri ...