Gmc 2002 Sierra User Manual Page 160

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2-79
Compass Calibration
The compass may need calibration if one of the
following occurs:
After five seconds, the display does not show a
compass heading (N for North, for example), there
may be a strong magnetic field interfering with the
compass. Such interference may be caused by a
magnetic antenna mount, magnetic note pad holder
or a similar magnetic item.
The compass does not display the correct heading
and the compass zone variance is set correctly.
In order to calibrate, CAL must be displayed in the
mirror compass windows. If CAL is not displayed, push
the on/off button for approximately 12 seconds or until
CAL is displayed.
The compass can be calibrated in one of two ways:
Drive the vehicle in circles at 5 mph (8 km/h) or less
until the display reads a direction, or
drive the vehicle on your everyday routine and after
several turns the compass will become calibrated and
will display a direction.
Cleaning the Mirror
When cleaning the mirror, use a paper towel or similar
material dampened with glass cleaner. Do not spray
glass cleaner directly on the mirror as that may cause the
liquid cleaner to enter the mirror housing.
Outside Manual Adjust Mirrors
Adjust your outside mirrors so you can just see the
side of your vehicle and have a clear view of objects
behind you. Some mirrors can be folded in, to enter
narrow doorways.
The use of hood
-mounted air deflectors and add-on
convex mirror attachments may adversely affect
mirror performance.
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