Buick 2002 Regal Owner's Manual page 116

Mirrors
Adjust all the mirrors so you can see clearly when you
are sitting in a comfortable driving position.
Inside Day/Night Rearview Mirror
To reduce glare from lamps behind you, pull the lever
at the bottom of the mirror toward you (to the night
position). To return the mirror to the day position, push
the lever away from you.
Inside Day/Night Rearview Mirror with
R
OnStar and Map Lamps (If Equipped)
This mirror has a lever located at the bottom of the
mirror between the two map lamps. This lever is used to
change the mirror from day to night position. To reduce
glare from headlamps behind you while driving at night,
_
turn the lever 90 . To return the mirror to the day
position, return the lever to its original position.
There are two map lamps located on the bottom of the
mirror. Each lamp is turned on and off by pressing the
button next to the lamp.
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There are also three OnStar buttons located at the
bottom of the mirror face. See your dealer for more
information on the system and how to subscribe to
OnStar. See "OnStar System" in the Index for more
information about the services OnStar provides.