Automatic Headlamp System
When the exterior lamp control is set to AUTO and it is dark enough outside, the headlamps come on automatically.

There is a light sensor located on top of the instrument panel. Do not cover the sensor. Otherwise the headlamps will come on when they are not needed.
The system may also turn on the headlamps when driving through a parking garage or tunnel.
When it is bright enough outside, the headlamps will turn off or may change to daytime running lamps (DRL).
The automatic headlamp system turns off when the exterior lamp control is turned to
or the ignition is off.
See also:
Roadside Assistance and OnStar
If you have an active OnStar
subscription, press the Q button and the current GPS location will be sent to
an OnStar Advisor who will assess your problem, contact Roadside Assistance, and
relay y ...
Exterior Lamp Controls
The exterior lamp control is located to the left of the steering column on the
instrument panel.
It controls the following systems:
Headlamps
Taillamps
Parking Lamps
License Plate Lamps ...
Vehicle Messages
Messages displayed on the DIC indicate the status of the vehicle or some action that may be needed to correct a condition. Multiple messages may display one after the other.
The messages that do not ...
