Oldsmobile 2001 Silhouette - Manual (Page 159)

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Interior Lamps
Instrument Panel Intensity Control
Turn the thumbwheel, located below the headlamps
control, clockwise to increase the brightness of the
instrument panel lights, and counterclockwise to
decrease the brightness. Turn the thumbwheel all the
way counterclockwise to turn them off.
Interior Lamps Control
Turn the thumbwheel all the way clockwise to turn on
the interior lamps, if the interior lamps override switch
is off. Turn the thumbwheel counterclockwise to turn
the lamps off.
Interior Lamps Override Switch
This switch is located
in the overhead
console switchbank.
Press the symbol on the bottom of the switch to
override control of the interior lamps and turn off power
to the courtesy lamps, reading lamps, visor vanity lamps
(if equipped) and glove box lamp. This feature allows
you to have the lamps off when any door is open.
Press the top of the interior lamps override switch to
turn power back on to the interior lamps. This will
allow the lamps to stay on when any door is open.