GMC 1999 Envoy, Owner'S Manual

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Exterior Lamps
Your parking lamp and headlamp switch is on the
driver’s side of your instrument panel.
Turn the knob clockwise to the parking lamps symbol to
manually turn on:
D Parking Lamps
D Sidemarker Lamps
D Taillamps
D License Plate Lamps
D Instrument Panel Lights
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 turn off
your lamps and put the system in auto 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 dim.
Your vehicle is equipped with High Intensity Discharge
(HID) headlamps. Your headlamps come on at lower
intensity and gradually increase to full brightness.
Your vehicle is equipped with a light sensor on the top
of the instrument panel under the radio speaker grille.
Be sure it is not covered or the system will be on
whenever the ignition is on.
The system may also turn on your headlamps when
driving through a parking garage, heavy overcast
weather or a tunnel. This is normal.