Cadillac 1995 DeVille Owners Literature page 130

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MIRRORS
Automatic Inside Rearview Mirror
Your Cadillac is
equipped with an
automatic
electrochromic inside
rearview mirror.
This mirror automatically changes to reduce glare from headlamps behind
you. A photocell on the back of the mirror senses when it is-becoming
dark outside. Another photocell built into the mirror surface senses the
headlamps behind you.
The mirror will darken gradually to reduce glare. This change may take, a
few seconds. When the glare subsides, the mirror returns to its ckar
daytime state.
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