GMC 1999 Savana Van Owner's Manual page 112

Reading Lamps (Option)
If your vehicle has reading lamps, press the button next
to the lamp to turn the lamp on.
Press the button again to turn the lamp off.
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Mirrors
Inside Day/Night Rearview Mirror
Pull the tab under the mirror toward you to reduce
glare from headlamps behind you after dark. Push the
tab away from you to restore the mirror to the
original position.
Outside Mirrors
Adjust your outside mirrors so you can just see the
side of your vehicle, and have a clear view of objects
behind you. Some mirrors can be folded in to enter
narrow doorways.
Electric Outside Rearview Mirrors (Option)
If you have electric mirrors, they can be adjusted to
point where you want from inside the vehicle.
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