Cadillac 1993 Fleetwood Owners Literature page 128

MIRRORS
Inside DaylNight Rearview Mirror
To reduce glare from lights behind you, move the lever like this:
Automatic
Your Cadillac may
have the optional
automatic
electrochromic
rearview mirror.
During the daylight it's like the standard mirror. But at night the system
goes to work.
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