2012 GMC Sierra Owner's Manual - Page 26

1-20 In Brief Dome Lamp Override The dome lamp override button is located next to the exterior lamps control. Reading Lamps For vehicles with reading lamps in the overhead console, 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. For more information about interior lamps, see: . . Interior Lighting Dome Lamps The dome lamps are located in the overhead console. They come on when any door is opened and turn off after all the doors are closed. Turn the instrument panel brightness knob located below the dome lamp override button, clockwise to the farthest position to manually turn on the dome lamps. The dome lamps remain on until the knob is turned counterclockwise. Dome Lamps on page 6‑8. Reading Lamps on page 6‑8. Instrument Panel Illumination Control on page 6‑7. 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. k: .