2003 Buick Regal Owner's Manual - Page 118

A light sensor on top of the instrument panel makes the DRL work, so be sure it isn't covered. The DRL system will make your front turn signal lamps come on when the following conditions are met: The ignition is on, the exterior lamps control is off and the parking brake is released. When the DRL are on, only your front turn signal lamps will be on. The headlamps, taillamps, sidemarker and other lamps won't be on. Your instrument panel won't be lit up either. When it's dark enough outside, your front turn signal lamps will turn off and your vehicle's headlamps and parking lamps will turn on. The other lamps that come on with your headlamps will also come on. When it's bright enough outside, your headlamps will go off and your front turn signal lamps will come on. To idle your vehicle with the DRL and automatic headlamp control off, set the parking brake while the ignition is in OFF or LOCK. Then start your vehicle. The DRL, headlamps and parking lamps will stay off until you release the parking brake. To turn off the automatic headlamp feature when it's dark outside, move theexterior lamp control to the parking lamp position. Your parking lamps will remain illuminated and your headlamps will turn off. The fog lamps will also be lit if they were on when you switched to the parking lamp position. As with any vehicle, you should turn on the regular headlamp system when you need it. Delayed Headlamps Delayed headlamps illumination provides a period of exterior lighting as you leave your vehicle. The feature is activated when your vehicle's headlamps are on due to the automatic headlamp control feature described previously in this section, and when your vehicle's ignition is turned off. Your headlamps will then remain on until the exterior lamps control is moved from OFF to the parking lamp position or until a 90 second lighting period has ended. If you turn off the ignition with the exterior lamps control in the parking lamp or headlamps position, the delayed headlamps illumination cycle will not occur. You can customize the vehicle to activate delayed headlamps illumination when your vehicle's ignition is turned off under the conditions described above, or you may choose not to activate this feature under any conditions. 3-13