GM Service Manual Online
For 1990-2009 cars only

Headlamps

See Turn Signal/Multifunction Lever for more information on the headlamps.

Daytime Running Lamps

Daytime Running Lamps (DRL) can make it easier for others to see the front of your vehicle during the day. DRL can be helpful in many different driving conditions, but they can be especially helpful in the short periods after dawn and before sunset. Fully functional daytime running lamps are required on all vehicles first sold in Canada.

The DRL system will make the turn signal lamps come on when the following conditions are met:

    • It is still daylight and the ignition is in ON or START,
    • the exterior lamp control is in OFF or AUTO with the headlamps off, and
    • an automatic transmission is not in PARK (P) or the parking brake is not set on a manual transmission.

When DRL are on, only your front turn signal lamps will be on. No other exterior lamps will be on when the DRL are being used. Your instrument panel won't be lit up either.

When the exterior lamp control is in AUTO and it's dark enough outside, the DRL will turn off and the low-beam headlamps will turn on. When it's bright enough outside, the low-beam headlamps will go off, and the DRL will turn back on. If you start your vehicle in a dark garage, the automatic headlamp system will come on immediately. Once you leave the garage, it will take about one minute for the automatic headlamp system to change to DRL if it is light outside. During that delay, your instrument panel cluster may not be as bright as usual. Make sure your instrument panel brightness lever is in the full bright position. See "Instrument Panel Brightness" under Interior Lamps .

If it's dark enough outside and the exterior lamp control is off, a Headlamps Suggested message will appear on the Driver's Information Center (DIC) display. This message informs the driver that turning on the exterior lamps is recommended even though the DRL are still illuminated. Turning the exterior lamp control to AUTO or to the low-beam headlamp position will turn off the DRL and cancel the Headlamps Suggested message. If the parking lamps or the fog lamps were turned on instead, the DRL will still turn off and the Headlamps Suggested message will be displayed. You can turn it off by pressing the OK button if you have the Navigation audio system or the CLR button if you have the Base audio system.

To operate your vehicle with the DRL off, turn the exterior lamp control off. Then turn on the fog lamps or parking lamps, and the DRL will turn off. The Headlamps Suggested message will appear on the DIC display. This will work regardless of gear position and whether or not the parking brake is set.

As with any vehicle, you should turn on the regular headlamp system when you need it.

Light Sensor


Object Number: 829326  Size: A2

The light sensor for the DRL and AUTO headlamp feature is located on top of the instrument panel. If you cover the sensor, it will read dark, and the exterior lamps or the Headlamps Suggested message will appear on the DIC whenever the ignition is on.

Exterior Lighting Battery Saver

If the parking lamps or headlamps have been left on, the exterior lamps will turn off about 10 minutes after the ignition is turned to OFF. This protects against draining the battery in case you have accidentally left the headlamps or parking lamps on. The battery saver does not work if the headlamps are turned on after the ignition is turned to OFF.

If you need to leave the lamps on for more than 10 minutes, use the exterior lamp control to turn the lamps back on.