GM Service Manual Online
For 1990-2009 cars only

When it is dark enough outside, the automatic headlamp system turns on the low-beam headlamps at the normal brightness along with other lamps such as the taillamps, sidemarker, parking lamps and instrument panel lights. An indicator light on the instrument panel comes on when the headlamps are on. See Instrument Panel Cluster .

If the vehicle is driven through a parking garage, overcast weather, or a tunnel, the automatic headlamp system may turn on. There is a delay before the lights turn on when starting the car at night.

Do not cover the automatic light sensor, located on the top left corner of the instrument panel. If the sensor is covered the headlamps will stay on continuously.