Cadillac 1993 Eldorado Owners Literature page 125

MIRRORS
Inside DaylNight Rearview Mirror
To reduce glare from lights behind you, move the lever like this:
Automatic Inside Rearview Mirror
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.
During the day the mirror reflects all the light from behind your car. At
night, when the glare is too high, it darkens to reflect only part of the light
behind you. When the mirror darkens, it holds that position until the
glare is no longer present.
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