2008 GMC Acadia Owner's Manual - Page 159

Instrument Panel Brightness D (Instrument Panel Brightness): The knob with this symbol on it is located next to the exterior lamps control. Push the knob in all the way until it extends out and then turn the knob clockwise to brighten or counterclockwise to dim the lights. Push the knob back in when finished. Dome Lamp Override The dome lamp override button is located next to the exterior lamps control. The dome lamp override is used to set the dome lamps to remain off or come on automatically when a door is opened. Courtesy Lamps When a door is opened, the courtesy lamps automatically come on. They make it easy for you to enter and leave your vehicle. You can also manually turn these lamps on by fully turning the instrument panel brightness control clockwise. The reading lamps, located on the headliner above the rearview mirror, can be turned on or off independent of the automatic courtesy lamps, when the doors are closed. E (Dome Lamp Override): 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 Lighting Your vehicle may have courtesy lamps that will come on and stay on for a set time whenever the unlock symbol is pressed on the Remote Keyless Entry (RKE) Transmitter, if the vehicle has one. If a door is opened, the lamps stay on while it is open and then turn off automatically about 25 seconds after the door is closed. If the unlock symbol is pressed and you do not open a door, the lamps turn off after about 20 seconds. Dome Lamps The dome lamps automatically come on when a door is opened, unless the dome lamp override button is pressed in. The lamps can also be turned on and off by turning the instrument panel brightness control clockwise to the farthest position. 3-17