GM Service Manual Online
For 1990-2009 cars only

When it is dark enough outside and the exterior lamps control is in the automatic position, the headlamps come on automatically. See Headlamps .

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.