2011 Chevrolet Avalanche Owner's Manual - Page 200

6-4 Lighting When it begins to get dark, the automatic headlamp system switches from DRL to the headlamps. To turn off the DRL lamps, turn the exterior lamps control to the OFF position and then release. For vehicles first sold in Canada, the transmission must be in the P (Park) position before the DRL lamps can be turned off. To turn off the automatic headlamp system, turn the exterior lamps switch to the off position and then release. For vehicles first sold in Canada, the transmission must be in the P (Park) position, before the automatic headlamp system can be turned off. Daytime Running Lamps (DRL) Daytime Running Lamps (DRL) can make it easier for others to see the front of your vehicle during the day. Fully functional daytime running lamps are required on all vehicles first sold in Canada. The DRL system comes on when the following conditions are met: . . The ignition is on. The exterior lamps control is in AUTO. The transmission is not in Park. The light sensor determines it is daytime. Automatic Headlamp System When it is dark enough outside and the headlamp switch is in AUTO, the automatic headlamp system turns on the headlamps along with other lamps such as the taillamps, sidemarker, parking lamps, roof marker lamps, and the instrument panel lights. The radio lights will also be dim. . . When the DRL system is on, only the DRL lamps are on. The taillamps, sidemarker, instrument panel lights, and other lamps will not be on. The vehicle has a light sensor located on the top of the instrument panel. Do not cover this sensor or the system will come on whenever the ignition is on. The system may also turn on the headlamps when driving through a parking garage, a tunnel, or while driving in heavy overcast weather. This is normal.