GMC 1996 Savana Van Owner's Manual page 94

Rotate the switch knob clockwise again to the master
lighting symbol to turn on all the lamps listed as well as
the headlamps.
Rotate the switch counterclockwise to OFF to turn off
your lamps.
Rotate the thumb wheel next to the switch knob up to
adjust instrument panel lights. Rotate the thumb wheel up
to the first notch to return the radio display and gearshift
indicator display to full intensity when the headlamps or
parlung lamps are on.
Rotate the thumb wheel up to the second notch to
activate the interior dome lamps.
You can switch your headlamps from high to low beam
by pulling on the turn signal/high beam lever.
A circuit breaker protects your headlamps. If you have
an electrical overload, your headlamps will flicker on
and off. Have your headlamp wiring checked right away
if this happens.
Headlamps On Reminder
A buzzer will sound when your headlamps are turned on
and your ignition is in OFF, LOCK or ACCESSORY,
If you need to use your headlamps when the ignition
switch is in OFF, LOCK or ACCESSORY, the buzzer
can be turned off by turning the thumb wheel next to the
parking lamp/headlamp switch all the way down.
Daytime Running Lamps (If Equipped)
Daytime Running Lamps (DRL) can make it easier for
others to see the front of your vehicle during the day.
DRL can be helpful in many different driving
conditions, but they can be especially helpful in the
short periods after dawn and before sunset.
The DRL system will make your headlamps come on
at
a reduced brightness when:
0
The ignition is on,
The headlamp switch is off and
0
The parking brake is released.
If your vehicle was first sold, when new, in Canada,
your headlamps will come on at reduced brightness.