Cadillac 1996 DeVille Owner's Manual page 110

On/Off Switch
Time Delay
This feature prevents rapid changing of the mirror from
the night mode to the day mode as you drive under
lights and through traffic.
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Press the button at the base of the mirror to turn on the
automatic feature. The button has an indicator light to
show it is on. Press the button to turn the automatic
feature off.
Reverse Gear Day Mode
The reverse mode is another important feature of the
automatic mirror. When the shift lever is placed in
REVERSE (R), the mirror changes to the day mode.
This gives you a bright image in the mirror as you
back up.
Cleaning Photocells
Use a cotton swab and glass cleaner to clean the front
and rear photocells that make the auto-dimming
feature work.
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