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 the low-beam headlamps come on at reduced intensity when the following conditions are met:

    • It is still daylight and the ignition is on.
    • The exterior lamp control is in the off position.
    • The transaxle is not in PARK (P).

When DRL are on, only your low-beam headlamps at reduced brightness will be on. No other exterior lamps such as the parking lamps, taillamps, etc. will be on when the DRL are being used. Your instrument panel will not be lit up either.

When the Twilight Sentinel® lever is on and it is dark enough outside, the low-beam headlamps at reduced intensity will turn off and normal low-beam headlamp operation will occur.

When the Twilight Sentinel lever is on and it is bright enough outside, the regular lamps will go off, and the low-beam headlamps at reduced brightness will take over. 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 approximately 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 knob is in the full bright position. See Instrument Panel Brightness .

If it is dark enough outside and the Twilight Sentinel lever is off, a HEADLAMPS SUGGESTED message will display on the Driver's Information Center (DIC). This message informs the driver that turning on the exterior lamps is recommended even though the DRL are still illuminated.

Turning on the Twilight Sentinel or the headlamps will deactivate the DRL and remove the HEADLAMPS SUGGESTED message. If the parking lamps or the fog lamps were turned on instead, the DRL will still deactivate and the HEADLAMPS SUGGESTED message will continue to be displayed.

To idle your vehicle with the DRL off at night, turn off the Twilight Sentinel and shift the transaxle into PARK (P). Placing your vehicle in PARK (P) disables the DRL. The DRL will stay off until you shift out of PARK (P).

To drive your vehicle with the DRL off, turn off the Twilight Sentinel and manually turn on the parking lamps or fog lamps (if equipped).

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