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. Fully functional daytime running lamps are required on all vehicles first sold in Canada.

The DRL system will make your headlamps come on at reduced brightness when the following conditions are met:

    • Ignition is on.
    • Exterior lamps knob is in AUTO.
    • Light sensor detects daytime light.
    • Automatic transmission is not in PARK (P).
    • The parking brake is not set.

When the DRL are on, only your headlamps will be on. The taillamps, sidemarker and other lamps won't be on. The instrument panel won't be lit up either.

When it begins to get dark, the headlamps will automatically switch from DRL to the regular headlamps.

To idle your vehicle with the DRL off, set the parking brake when the ignition is off and then start your vehicle. The DRL will stay off until you release the parking brake.

In DRL mode further cycling of the park brake will do the following if your vehicle was made in the United States:

    • If your vehicle has an automatic transmission, pulling up the parking brake and then releasing it will turn on the DRL. If you repeat this, the DRL will turn off and stay off. This applies to the automatic headlamps as well.
    •  If your vehicle has a manual transmission, pulling the parking brake up will turn off the DRLs. If the parking brake is released, the DRLs will turn on. After the first cycle of the park brake, the automatic headlamps will stay on and the system does not respond to further cycling of the park brake until the next time you turn on your vehicle.