1999 GMC Savana Van Owner's Manual - Page 111

yellowblue Interior Lamps Dome Lamps The dome lamps will come on when you open the doors. You can also turn the dome lamps on by moving the thumbwheel, located next to the headlamp knob, all the way up to the second notch. In this position, the dome lamps will remain on whether the doors are open or closed. You can use the DOME OVERRIDE button, located below the headlamp knob, to set the dome lamps to automatically come on when the doors are open, or to remain off. If the DOME OVERRIDE button is pushed in, the dome lamps will not come on. If the DOME OVERRIDE button is out, your interior lamps will work as usual. If the button is pressed in, the interior lamps will not come on when any of the vehicle's doors are open. This feature is helpful when you want to leave your door(s) open for an extended period of time and do not want to run the battery down. The button is located next to the lamp switch. If you have the optional reading lamps, they will still operate if the button is pressed in. 2-43