Pontiac 1997 Grand Prix Owner's Manual page 127

Mirrors
Adjust all the mirrors so you can see clearly when you
are sitting in a comfortable driving position.
Inside Daymight Rearview Mirror
Electrochromic Daymight Rearview Mirror
(If Equipped)
To reduce glare from lamps behind you, push the lever
away from you (to the night position). To return the mirror
back to the day position, pull the lever toward you.
Your Pontiac may have an electrochromic dayhight
rearview mirror. Push the button on the bottom of the
mirror to turn this feature on. The mirror will darken
gradually to reduce glare from headlamps behind you.
This may take a few moments.
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