GM Service Manual Online
For 1990-2009 cars only

When it is dark enough outside, the automatic headlamp system turns on the headlamps at the normal brightness, along with the taillamps, sidemarker, parking lamps, and the instrument panel lights. The radio back lighting is also dimly lit.

To turn off the automatic headlamp system, turn the exterior lamps switch to the off position. Turning off the automatic headlamp system with the headlamp switch is not available for vehicles first sold in Canada.

Your vehicle has a light sensor located on the top of the instrument panel in the defroster grille that regulates when the automatic headlamps turn on. Be sure it is not covered, or the headlamps will come on whenever the ignition is on.

The automatic system could also come on while driving through a parking garage, tunnel, or in heavy overcast weather. This is normal.

There is a delay in the transition between the daytime and nighttime operation of the Daytime Running Lamps (DRL) and the automatic headlamp system so that driving under bridges or bright overhead street lights does not affect the system. The DRL and automatic headlamp system are only affected when the light sensor detects a change in lighting lasting longer than the delay.

If you start your vehicle in a dark garage, the automatic headlamp system comes on immediately. Once you leave the garage, it takes approximately one minute for the automatic headlamp system to change to DRL if it is bright enough outside. During that delay, the instrument panel cluster might not be as bright as usual. Make sure your instrument panel brightness control is in the full bright position. See Instrument Panel Brightness .

To idle your vehicle with the automatic headlamp system off, turn the control to the off position.

You might be able to turn off your Automatic Headlamp System. See Daytime Running Lamps (DRL) for more information.

The headlamps can also stay on after you exit the vehicle. This feature can be programmed using the Driver Information Center (DIC). See DIC Vehicle Customization .

The regular headlamp system can be turned on when needed.