See also:

High/Low—Beam Headlamps (Uplevel)
The high/low beam headlamps on the uplevel are High Intensity Discharge (HID) and should be replaced at the dealer. ...

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 ...

Potential Issues
Some OnStar services are disabled after five days. OnStar cannot perform Remote Door Unlock or Stolen Vehicle Assistance after the vehicle has been off continuously for five days. After five ...