2010 GMC Savana 2500 Cargo Owner's Manual - Page 157

Headlamps on Reminder If a door is open, a reminder chime sounds when the headlamps or parking lamps are manually turned on and the key is out of the ignition. To turn off the chime, turn the headlamp switch to off or auto and then back on, or close and re-open the door. In the auto mode, the headlamps turn off once the ignition is in LOCK/OFF or may remain on until the headlamp delay ends, if enabled in the Driver Information Center (DIC). See "Exit Lighting" under DIC Vehicle Customization on page 4-52. 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. To turn off the DRL, turn the exterior lamp control to the off position 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. 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 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. 4-11 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 in daylight when the following conditions are met: 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.