2004 GMC Savana Van Owner's Manual - Page 138

Center High-Mounted Stoplamp Interior Lamps Instrument Panel Brightness Control Press this knob located next to the exterior lamps knob to extend and turn it to adjust the instrument panel brightness. Your vehicle's center high-mounted stoplamp is located above the rear doors at the center of the vehicle. If items are loaded on the roof of the vehicle, as in a luggage carrier, care should be taken not to block or damage the center high-mounted stoplamp unit. Turn the knob all the way up to turn on the interior lamps. Press the knob back into its stored position. 3-16