Automatic Headlamp System - Chevrolet 2002 Astro Owner's Manual

The exterior lamp control has three positions:
(Off): Turning the control to this position turns off all
lamps except the Daytime Running Lamps (DRL).
(Parking Lamps):Turning the control to this
position turns on the parking lamps, together with the
following:
D
Sidemarker Lamps
D
Taillamps
D
License Plate Lamps
D
Instrument Panel Lights
D
Ashtray Lamp
(Headlamps): Turning the control to this position
turns on the headlamps, together with the previously
listed lamps and lights.

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 a light sensor on the top
of the instrument panel in the defroster 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.
There is a delay in the transition between the daytime
and nighttime operation of the Daytime Running Lamps
(DRL) and the automatic headlamp systems so that
driving under bridges or bright overhead street lights
does not affect the system. The DRL and automatic
headlamp system will only be affected when the light
sensor sees a change in lighting lasting longer than
the delay.
To idle your vehicle with the automatic headlamp
system off, set the parking brake while the ignition is
off. Then start your vehicle. The automatic headlamp
system will stay off until you release the parking brake.
You may be able to turn off your automatic headlamp
system. See"Daytime Running Lamps (DRL)" later
in this section for more information.
As with any vehicle, you should turn on the regular
headlamps when you need them.
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