2002 GMC Envoy Owner's Manual - Page 115

Exterior Lamps Your exterior lamps knob is located on the driver's side of your instrument panel. Turn the knob clockwise to the master lamps symbol to turn on all the lamps listed as well as the headlamps. Turn the knob all the way counterclockwise to this symbol to turn off the lamps and put the system in automatic headlamp mode. Automatic Headlamp System When it is dark enough outside, your automatic headlamp system will turn on your headlamps at the normal brightness along with other lamps such as the taillamps, sidemarker, parking lamps and the instrument panel lights. The radio lights will also be on. Your vehicle is equipped with a light sensor on the top of the instrument panel. Be sure it is not covered or the system will be on whenever the ignition is on. The system may also turn on your lights when driving through a parking garage, heavy overcast weather or a tunnel. This is normal. Turn the knob clockwise to the parking lamps symbol to manually turn on the following: D D D D D Parking Lamps Sidemarker Lamps Taillamps License Plate Lamps Instrument Panel Lights 2-46