2011 GMC Savana 1500 Cargo Owner's Manual - Page 165

Lighting 6-3 Daytime Running Lamps (DRL) Daytime Running Lamps (DRL) can make it easier for others to see the front of the vehicle during the day. Fully functional daytime running lamps are required on all vehicles first sold in Canada. The DRL system comes on in daylight when the following conditions are met: . . To turn off the DRL, turn the exterior lamp control to O and then release it. For vehicles first sold in Canada, the transmission must be in the P (Park) position, before the DRL can be turned off. The vehicle has a light sensor located on the top of the instrument panel. Do not cover the 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 or tunnel. There is a delay in the transition between the daytime and nighttime operation of the Daytime Running Lamps (DRL) and the automatic headlamp systems so that driving under bridges or bright overhead street lights does not affect the system. The DRL and automatic headlamp system is only affected when the light sensor sees a change in lighting lasting longer than the delay. 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 the taillamps, sidemarker, parking lamps, roof marker lamps, and the instrument panel lights. The radio lights will also be dim. 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. The ignition is on. The exterior lamps control is in the AUTO position. The shift lever is not in P (Park). The light sensor determines it is daytime. . . When the DRL are on, the taillamps, sidemarker, instrument panel and other lamps will not be on. The automatic headlamp system automatically switches from DRL to the headlamps depending on the darkness of the surroundings.