2003 GMC Envoy Owner's Manual - Page 139

Exterior Lamps Your exterior lamps knob is located on your instrument panel to the left of the steering wheel. ?-)o: (Parking Lamps): Turn the knob to this symbol to manually turn on the following: Parking Lamps Sidemarker Lamps Taillamps License Plate Lamps Instrument Panel Lights (Headlamps): Turn the knob to this symbol to turn on all the lamps listed as well as the headlamps. * Automatic Headlamp System (Off): Turn the knob to this symbol and release it to turn off the Daytime Running Lamps (DRL) and the automatic headlamps. An indicator will illuminate when the position is selected. (Automatic DRUAHL): Turning the knob to this symbol puts the system into automatic headlamp mode. An indicator will illuminate when the position is selected. :::. / ... 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. 3-14