Mirrors
Manual Rearview Mirror
To adjust the angle of the mirror, move the mirror to a
position that allows you see to out of the back window.
To adjust the height of the mirror, adjust the arm
that connects the mirror to the windshield.
To reduce glare from lights behind you, move the lever
toward you to the night position.
Automatic Dimming Rearview Mirror
with OnStar
®, Compass and
Temperature Display
If the vehicle has this feature, an automatic dimming
mirror automatically dims to the proper level to minimize
glare at night from lights behind your vehicle. For more
information about OnStar
®, seeOnStar®System on
page 2-32.
The mirror also includes a dual display in the upper right
corner of the mirror face. The compass reading and the
outside temperature will both appear in the display at the
same time.
Y(On/Off):This is the on/off button.
Automatic Dimming Mirror Operation
The automatic dimming mirror function is turned
on each time the ignition is started. A light near the
on/off button will come on to indicate the automatic
dimming is on.
Press the on/off button for about four seconds to
manually turn the automatic dimming function on or off.
Temperature and Compass Display
Press the on/off button, located to the far left, to cycle
between °F, °C and off.
If the display reads CAL, the compass needs to be
calibrated. For more information, see “Compass
Calibration” later in this section.
If an abnormal temperature reading is displayed for an
extended period of time, please consult your dealer.
Under certain circumstances, especially in idle, an
increase and delay in updating the temperature is
normal.
2-27
Compass Variance
Press the on/off button twice to turn on the compass.
Compass variance is the difference between earth’s
magnetic north and true geographic north. If not
adjusted to account for compass variance, the mirror’s
compass could give false readings. The mirror is
set in zone eight upon leaving the factory. It will be
necessary to adjust the compass to compensate
for compass variance if you live outside of zone eight.
Under certain circumstances, as during a long distance
cross-country trip, it will also be necessary to adjust
for compass variance.
To adjust for compass variance do the following:
1. Find your current location and variance zone
number on the following zone map.
2. Press the on/off button approximately seven seconds
until the word ZONE appears in the display. The
compass is now in zone mode.
3. Press and release the on/off button until the
desired zone number appears in the display.
After approximately four seconds of inactivity,
the new zone number will be locked in and the
compass/temperature display will return.
4. Calibrate the compass as described below.
2-28