GMC 2002 Envoy - Manual (Page 115)

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Exterior Lamps
Your exterior lamps knob is
located on the driver’s side
of your instrument panel.
Turn the knob clockwise to the parking lamps
symbol to manually turn on the following:
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 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.