GM Service Manual Online
For 1990-2009 cars only

This feature works when the ignition is ON and it is dark outside. To turn the headlamps off when it is dark outside but keep other exterior lights on, turn the exterior lamp control to the parking lamp position. In this position, the parking lamps, sidemarker lamps, taillamps, license plate lamps and instrument panel lights are on, but the headlamps are off.

To turn on the headlamps along with the other lamps when it is dark outside, turn the exterior lamp control to the AUTO or headlamp position.

This feature will not work for Canadian vehicles.