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 will be on, but the headlamps will be 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 work for Canadian vehicles if the vehicle is in PARK (P).