2007 GMC Acadia Owner's Manual - Page 185

Daytime Running Lamps (DRL)/ Automatic Headlamp System 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. A light sensor on top of the instrument panel makes the DRL work, so be sure it is not covered. The DRL system's automatic headlamp control will make the low-beam headlamps come on at a reduced brightness when the following conditions are met: • The ignition is in the ON position. • The exterior lamps control is in AUTO. • The engine is running. When the DRL are on, only the low-beam headlamps, at a reduced level of brightness, will be on. The headlamps, taillamps, sidemarker, and other lamps will not be on. The instrument panel and cluster will also not be lit. When it is dark enough outside, the low-beam headlamps will turn off and the headlamps and parking lamps will turn on. The other lamps that come on with the headlamps will also come on. When it is bright enough outside, the headlamps will go off and the DRL will come on. As with any vehicle, you should turn on the regular headlamp system when it is needed. 185