GMC 1999 Savana Van Owner's Manual page 108

When the thumbwheel is moved to full brilliance, and
then into the first detent position, the radio display and
PRNDL display will go to the day mode (full intensity).
This is known as "parade" mode. The rest of the
I/P illumination will stay in the maximum dimming state
(full brilliance dimming). Moving the thumbwheel up
one more detent will activate the interior dome light
circuit (with slightly higher effort).
The vehicle is also equipped with a DOME OVERRIDE
button. For more information on this feature see "Dome
Lamps" in the Index.
The delayed entry feature will allow you to enter or
exit your vehicle with the lights staying on for about
20 seconds, after the door is closed or ignition is cycled.
Turn the knob clockwise to the parking lamp symbol to
turn on:
D
Parking Lamps
D
Sidemarker Lamps
D
Taillamps
D
License Plate Lamps
D
Instrument Panel Lights
D
Ashtray Lamp
2-40
Turn the knob clockwise again to the master lighting
symbol to turn on all the lamps listed above as well as
the headlamps.
Turn the knob counterclockwise to OFF to turn off your
lamps and lights.
Move the thumbwheel next to the switch knob up to
adjust instrument panel lights. Move the thumbwheel up
to the first notch to return the radio display and gearshift
indicator display to full intensity when the headlamps or
parking lamps are on.
Move the thumbwheel up to the second notch to turn on
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.
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