GMC 2011 Sierra - Manual (Page 155)

Black plate (7,1) GMC Sierra Owner Manual - 2011
Instruments and Controls 5-7
2. Find the vehicle's current
location and variance zone
number on the map.
Zones 1 through 15 are
available.
3. Press the set/reset button to
scroll through and select the
appropriate variance zone.
4. Press the trip/fuel button
until the vehicle heading,
for example, N for North,
is displayed in the DIC.
Or, if the vehicle does not
have DIC buttons, press and
hold the trip odometer reset
stem for two seconds to select
the next available variance
zone. Repeat this step until
the appropriate variance
zone is displayed.
5. If calibration is necessary,
calibrate the compass.
See “Compass Calibration
Procedure” following.
Compass Calibration
The compass can be manually
calibrated. Only calibrate the
compass in a magnetically clean
and safe location, such as an
open parking lot, where driving the
vehicle in circles is not a danger.
It is suggested to calibrate away
from tall buildings, utility wires,
manhole covers, or other industrial
structures, if possible.
If CAL should ever appear in the
DIC display, the compass should be
calibrated.
If the DIC display does not show a
heading, for example, N for North,
or the heading does not change
after making turns, there may be
a strong magnetic field interfering
with the compass. Such interference
may be caused by a magnetic CB
or cell phone antenna mount, a
magnetic emergency light, magnetic
note pad holder, or any other
magnetic item. Turn off the vehicle,
move the magnetic item, then turn
on the vehicle and calibrate the
compass.