2007 GMC Yukon Owner's Manual - Page 209

If you experience a problem, see your dealer for additional information on the accessory power plugs. The accessory power outlets are powered, even with the ignition off. Continuing to use power outlets while the ignition is off may cause the vehicle's battery to run down. Notice: Adding any electrical equipment to your vehicle may damage it or keep other components from working as they should. The repairs would not be covered by your warranty. Do not use equipment exceeding maximum amperage rating. Check with your dealer before adding electrical equipment. When adding electrical equipment, be sure to follow the proper installation instructions included with the equipment. Do not use equipment exceeding the maximum amperage rating of 20 amperes. Notice: Improper use of the power outlet can cause damage not covered by your warranty. Do not hang any type of accessory or accessory bracket from the plug because the power outlets are designed for accessory power plugs only. Ashtray(s) and Cigarette Lighter The front ashtray is located near the center of the instrument panel or on the front console, if equipped. Pull on the ashtray door to open it. Notice: If you put papers, pins, or other flammable items in the ashtray, hot cigarettes or other smoking materials could ignite them and possibly damage your vehicle. Never put flammable items in the ashtray. To remove the front ashtray pull the ashtray up. To use the cigarette lighter, push it in all the way, and let go. When it's ready, it will pop back out by itself. Notice: Holding a cigarette lighter in while it is heating will not allow the lighter to back away from the heating element when it is hot. Damage from overheating may occur to the lighter or heating element, or a fuse could be blown. Do not hold a cigarette lighter in while it is heating. 209