GM Service Manual Online
For 1990-2009 cars only

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.

The DRL system will turn the low-beam headlamps on at a reduced brightness when the following conditions are met:

    • The ignition is on.
    • The exterior lamp control is turned to AUTO.
    • The light sensor detects daytime light. See the end of this section for more information on the light sensor.
    • The shift lever is not in PARK (P).

While the DRL system is on, the taillamps, sidemarker lamps, and instrument panel lights will not be illuminated.

The DRL system is off while the vehicle is in PARK (P). The DRL system can also be turned off by using the off/on switch for one ignition cycle.

The regular headlamp system should be turned on when needed.

Light Sensor

The vehicle has a light sensor on top of the instrument panel. Make sure it is not covered or the headlamps may remain on when they are not needed. The light sensor for the DRL and Automatic Headlamp features is located on top of the instrument panel.

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