Jeep Wrangler Owner's Manual page 158

NOTE:
• A good calibration requires a level surface
and an environment free from large metallic
objects such as buildings, bridges, under-
ground cables, railroad tracks, etc.
• Magnetic and battery powered devices,
(such as cell phones, iPod's, radar detec-
tors, PDA's and laptops) should be kept
away from the top of the instrument
panel. This is where the compass module
is located and such devices may interfere
and cause false compass readings.
Manual Compass Calibration
NOTE:
Before attempting a manual compass calibra-
tion, the engine must be running and the
transmission in the PARK position (if
equipped).
If the compass appears erratic or inaccurate
and the variance has been properly set, you
may wish to manually recalibrate the compass.
To manually calibrate the compass:
1. First enter the variance mode. Press and hold
the left button (located on the instrument cluster)
156
for approximately 10 seconds to enter the vari-
ance mode, and release the button when the VAR
(Compass Variance) symbol appears.
2. The current variance value will also be dis-
played. Once in the variance mode, it is nec-
essary to release the button, and then press
and hold it again (approximately 10 seconds)
until CAL is displayed (solid, not blinking).
3. Manual compass calibration has been initi-
ated. Drive the vehicle slowly in one or more
circles under 5 mph (8 km/h) in an area free
from large metal objects until the CAL indicator
turns off.
When the CAL symbol is no longer displayed, the
compass is calibrated and should display correct
headings. Verify proper calibration by checking
North (N), South (S), East (E), and West (W). If the
compass does not appear accurate, repeat the
calibration procedure in another area.
Compass Variance (VAR)
Compass Variance is the difference between
Magnetic North and Geographic North. To en-
sure compass accuracy, the compass variance
should be properly set according to the vari-
ance map for the zone where the vehicle will be
driven. When properly set, the compass will
automatically account for this difference.
Setting The Compass Variance
Refer to the variance map for the correct com-
pass variance zone. To check the variance
zone, the ignition must be ON. Press and hold
the left button (located on the instrument clus-
ter) for approximately 10 seconds to enter the
variance mode and release the button when the
VAR symbol appears. The current variance
value will also be displayed. To change the
zone, press the left button once to increment
the zone. The default is Zone 8. After Zone 15,
the values will wrap around to Zone 1. When the
correct zone is displayed (per the Compass
Variance Zone Map) for the zone that the
vehicle is located in, wait for about ten sec-
onds; then the trip computer will store the
variance value in memory and the compass will
resume normal operation.
NOTE:
The U.S./Metric display will change from
English to Metric or Metric to English before
the VAR symbol appears, however, it will
revert back to its original setting after pro-
gramming the compass functions.