2009 Chevrolet Avalanche Owner's Manual - Page 198

Dome Lamp Override The dome lamp override button is located next to the exterior lamps control. Electric Power Management The vehicle has Electric Power Management (EPM) that estimates the battery's temperature and state of charge. It then adjusts the voltage for best performance and extended life of the battery. When the battery's state of charge is low, the voltage is raised slightly to quickly bring the charge back up. When the state of charge is high, the voltage is lowered slightly to prevent overcharging. If the vehicle has a voltmeter gage or a voltage display on the Driver Information Center (DIC), you may see the voltage move up or down. This is normal. If there is a problem, an alert will be displayed. The battery can be discharged at idle if the electrical loads are very high. This is true for all vehicles. This is because the generator (alternator) may not be spinning fast enough at idle to produce all the power that is needed for very high electrical loads. A high electrical load occurs when several of the following are on, such as: headlamps, high beams, fog lamps, rear window defogger, climate control fan at high speed, heated seats, engine cooling fans, trailer loads, and loads plugged into accessory power outlets. k (Dome Off): Press the button in and the dome lamps remain off when a door is opened. Press the button again to return it to the extended position so that the dome lamps come on when a door is opened. Entry/Exit Lighting The vehicle has an illuminated entry/exit feature. The dome lamps come on if the dome override button is in the out position, when a door is opened or the key is removed from the ignition. Reading Lamps If the vehicle has reading lamps, press the button located next to the lamp to turn it on or off. The vehicle may also have reading lamps in other locations. The lamps cannot be adjusted. 3-18