Buick RIVIERA 1993 Manual page 102

Automatic (Option)
Settings
Your Buick may have the automatic inside mirror.
The automatic mirror adjusts for the glare of headlights
behind you. It detects changes in light, and then adjusts
for day or night operatiol-~
During the day the mirror reflects all the light from
behind your car. At night, when the glare is too high, it
changes to the night mode. Then, it reflects only part of
the light from behind you. When the mirror changes to
the night mode, it holds that position until glare is no
longer present.
MIN: The minimum setting is suggested when driving
where glare conditions change
often. '"in"
works well
for city driving at night.
MAX: Maximum sensitivity is a good setting for
highway driving in light traffic. The mirror starts to
darken in any glare, such as headlights a long way
behind your car.
OFF:
The mirror will stay in the day mode.
Time Delay
The mirror delays before switching from the night back
to the day position. This delay prevents rapid changing
of the mirror as you drive under lights and through
traffic.
Reverse Gear Day Mode
The reverse mode is another important feature of the
automatic mirror. When the shift lever is placed in "R"
(Reverse), the mirror shifts to the day mode. This gives
you a bright image in the mirror as you back up.
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