Chevrolet 2002 Prizm Owner's Manual page 112

Reading Lamp (If Equipped)
If you have a sunroof, you have a reading lamp near the
sunroof switch. Press the button to turn the lamp on and
press it again to turn it off.
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Mirrors
Inside Day/Night Rearview Mirror with
Reading Lamps
The inside rearview mirror is attached to your vehicle's
front windshield glass. If you do not have a sunroof your
vehicle's inside rearview mirror may be equipped with
reading lamps. If your vehicle is equipped with this
mirror, there are two buttons located on the bottom of
the mirror. Press the buttons to turn the lamps on and
press them again to turn the lamps off.