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The mirror includes two map lamps, an automatic
dimming function and an eight
-point compass display in
the upper corner of the mirror face. When the compass
display is turned on, the compass automatically calibrates
as the vehicle is driven.
The automatic dimming feature is turned on or off 
by pressing the IO button located on the lower part 
of the mirror. Press and hold the IO button for up 
to three seconds to turn this feature on or off.
The compass display feature is turned on or off by
pressing the IO button for three seconds or more.
When cleaning the mirror, use a paper towel or similar
material dampened with glass cleaner. Do not spray
glass cleaner directly on the mirror housing.
The compass may need to be calibrated. See “Compass
Calibration” in the Index.
Electrochromic Day/Night Rearview Mirror
with Compass Display and OnStar
R
 
(If Equipped)
Your vehicle may have an automatic electrochromic
day/night rearview mirror with a compass display and
the OnStar system.
When turned on, this mirror functions exactly like 
the electrochromic mirror described previously. See
“Mirrors, Electrochromic Rearview with Compass” 
in the Index for more information.