See also:

Courtesy Lamps
The courtesy lamps come on automatically when any door is opened and the dome lamp is in the door position. ...

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 ...

Adding Equipment to the Outside of the Vehicle
Things added to the outside of the vehicle can affect the airflow around it. This can cause wind noise and can affect fuel economy and windshield washer performance. Check with your dealer/retail ...