1998 GMC Suburban Owner's Manual - Page 120

When it begins to get dark, yourDRL indicator light is a reminder to turn your headlamp switch on. The other lamps that come on with your headlamps will also come on. When you turn the headlamp switch off, the regular lamps will go off, and your headlamps will change to the reduced brightness of DRL. Illuminated Entry Your vehicle is equipped with an illuminated entry feature. When the doors are opened, the dome lamps will come on if the dome lamp button is in the out position. When all doors are closed or the dome lamp button is pressed in, the lamps will stay on for a short period of time and will then go out. To idle your vehicle with the DRL off, set the parking brake. The DRL will stay off until you release the parking brake. As with any vehicle, you should turn on the regular headlamp system when you need it. Dome Lamps The dome lamps will come on when you open the doors Interior Lamps Instrument Panel Intensity Control The instrument panel intensity control is located next to the parkingheadlamp switch. Rotate the thumb wheel up to adjust the instrument panel lights. Rotate the thumb wheel up to the first notch to return the radio display and gear shift indicator LED display to full intensity when the headlamps or parking lamps are on. To turn on the dome lamps (with the vehicle doors closed) rotate the thumb wheel up to the second notch position. You can also turn the dome lamps on by rotating the thumb wheel, located next to the parking/headlamps switch knob, all the way up to the second notch. In this position, the dome lamps will remain on whether the doors are opened or closed. 2-42