Chevrolet 1993 Astro Passenger Owner's Manual page 97

Your light switches are
on
the left side of the instrument panel above the
vent.
Press the top light switch
to
the left to turn on:
Parking Lights
Taillights
License Plate Lights
Instrument Panel Lights
Press the bottom light switch to the left to turn on the headlights, together
with:
Parking Lights
Taillights
License Plate Lights
Instrument Panel Lights
Press both switches to the right to turn off your lights.
Turn the dial above the light switches to the left to dim your instrument panel
lights.
Turn the dial to the right to brighten your instrument panel lights. If you turn
the dial all the way to the right until it clicks, your interior lights will come on.
You can switch your headlights from high to low beam by pulling on the
multifunction lever on the left of the steering column.
A circuit breaker protects your headlights. If you have an electrical overload,
your headlights will flicker on and off. Have your headlight wiring checked
right away if this happens.
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