Automatic Headlamp System
When it is dark enough outside and the exterior lamps control is in the automatic position, the headlamps come on automatically. See Exterior Lamp Controls .

The vehicle has a light sensor located on top of the instrument panel. Make sure it is not covered, or the headlamps will be on when they are not needed.
The system may also turn on the headlamps when driving through a parking garage or tunnel.
See also:
OnStar®
If the vehicle has OnStar and you subscribe to the
OnStar services, please refer to the OnStar Terms and
Conditions for information on data collection and use. ...
When the Light Is On Steady
This indicates that one or more of the tires are significantly underinflated.
A Driver Information Center (DIC) tire pressure message may also display. See
Vehicle Messages for more informati ...
Taillamps and Back-Up Lamps
A. Taillamp
B. Back-up Lamp
To replace an auxiliary taillamp or back-up lamp bulb:
1. Open the trunk. See Trunk.
2. Remove the three fasteners from the trunk trim.
3. Pull back the trunk trim ...
