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Electrochromic Automatic Dimming
Rearview Mirror (If Equipped)
Your vehicle may have an electrochromic day/night
rearview mirror. Push the button in the center of the
mirror to turn this feature on. The mirror will darken
gradually to reduce glare from headlamps behind you.
This may take a few moments.
The mirror’s two outer buttons operate the lights on the
bottom sides of the mirror.
One photocell on the front of the mirror senses when it
is becoming dark outside. Another photocell, facing
rearward, senses headlamps behind you. To turn the
electrochromic feature off, press the button in the center
of the mirror again.
To keep the photocells operating well, occasionally
clean them with a cotton swab and glass cleaner.
Electrochromic Day/Night Rearview
Mirror with OnStar
and Map Lamps
(If Equipped)
Your vehicle may have an automatic electrochromic
day/night rearview mirror with the OnStar System.
The automatic dimming feature is turned on or off by
pressing the far left button, located on the lower part of the
mirror face, for up to three seconds. When turned on, this
mirror functions exactly like the electrochromic mirror
described previously. See “Mirrors, Electrochromic
Automatic Dimming” listed previously in this section
for more information.