Automatic Headlamp System; Exterior Lamps - GMC Envoy XL 2003 Owner's Manual

Exterior Lamps

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(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.
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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

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.