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:
Vehicle Information Menu Items
Press MENU on the turn signal lever until the Vehicle Information Menu is displayed.
Use w / x to scroll through the following menu items:
Unit
Tire Pressure
Remaining Oil Life
Battery Vol ...
Radio Settings
Press the Config button on the Home Page or the CONFIG button on the faceplate
to enter the menu options. Turn the TUNE/MENU knob or touch-tap the scroll bar to
scroll through the available option ...
Interior Mirrors
Automatic Dimming Rearview Mirror
The vehicle has an automatic dimming inside rearview mirror.
Automatic dimming reduces the glare from the headlamps of the vehicle behind you.
Vehicles with OnStar ...
