GM Service Manual Online
For 1990-2009 cars only

When it is dark enough outside, your Automatic Headlamp System will turn on your headlamps at the normal brightness along with other lamps such as the taillamps, sidemarker, parking lamps, and the instrument panel lights. The radio lights will also be dim.

Your vehicle is equipped with a light sensor on the top of the instrument panel under the defroster grill. Make sure it is not covered, which will cause the system to be on whenever the ignition is on.

The system may also be on when driving through a parking garage, heavy overcast weather, or a tunnel. This is normal.

If you start your vehicle in a dark garage, the automatic headlamp system will come on immediately.

As with any vehicle, you should turn on the regular headlamps when you need them.

The headlamps can be set to come on at different levels. The sensitivity can be adjusted to Early, Normal, or Late. See Vehicle Personalization .

Leaving the headlamps and parking lamps on when the engine is not running will eventually drain the battery. To prevent the battery from draining, the headlamp and parking lamps will turn off when the ignition has been turned off and the driver's door is opened, because the vehicle senses that the driver has forgotten to turn off the lights. The lights stay off until the ignition is again turned on, or the lights are turned back on manually by the headlamp switch. The headlamps can be set to automatically turn off after you have locked the vehicle and walked away. To set or adjust the time delay from when the driver's door is opened to when the lights automatically turn off, see Vehicle Personalization . If you wish to have the lights on when leaving the vehicle, wait until they have been automatically turned off, then turn the light control first to off, then to parking lamps or headlamps.