2003 GMC Sierra 1500 Pickup Owner's Manual - Page 173

Dome Lamps The dome lamps will come on when you open a door. You can also turn the dome lamps on by turning the thumbwheel, located next to the exterior lamps control, all the way up. In this position, the dome lamps will remain on whether thedoors are opened or closed. You can use the dome override button, located below the exterior lamps control, to set the dome lamps to come on automatically when the doors are opened, or remain off. To turn the lamps off, press the button into the in position. With the button in this position, the dome lamps will remain off when the doors are open. To return the lamps to automatic operation, press the button again and return it to the out position. With the button in this position, the dome lamps will come on when you open a door. Accessory Power Outlets With accessory power outlets you can plug in auxiliary electrical equipment such as a cellular telephone or CB radio. Your vehicle may have two accessory power outlets, or may have one accessory power outlet located near the cigarette lighter, if equipped. The cigarette lighter is designed to fit only in the receptacle to the right of the accessory power outlet. To use the outlet, lift the cover. When not using it, always close the cover. Certain power accessory plugs may not be compatible to the accessory power outlet and could result in blown vehicle or adapter fuses. If you experience a problem, see your dealer for additional information on the accessory power plugs. Notice: Adding some electrical equipment to your vehicle can damage it or keep other things from working as they should. This wouldn't be coveredby your warranty. Check with your dealer before adding electrical equipment, and never use anything that exceeds the amperage rating. *: Battery Run-Down Protection This feature shuts off the dome, reading, glove box, and underhood lamps if they are left on for more than 10 minutes when the ignition is off. The cargo lamp will shut off after 20 minutes. This will keep your battery from running down. 3-1 8