Jeep 2004 Wrangler - Manual (Page 48)

When the vehicle is new, the compass should initially be
verified for correct compass variance (refer to Compass
Variation Adjustment) and calibrated manually (refer to
Manual Calibration). This will ensure correct initial cali-
bration and eliminate initial erroneous compass head-
ings.
Manual Calibration
If the compass appears erratic and CAL does not appear,
you must manually put the compass into the calibration
mode. To ensure proper compass calibration, make sure
the compass variance is properly set before manually
calibrating the compass (refer to Compass Variation
Adjustment).
To put the compass into calibration mode: Turn the
ignition to the ON position. Press and hold the center
button for more than 6 seconds until CAL (calibration
mode) appears in the display. To change the display
between VAR (compass variance) and CAL (compass
calibration) modes. Release the button to invoke manual
calibration mode. To recalibrate the compass, drive the
vehicle at less than 5 mph (8 km/h) through up to CAL
should display for a complete 1
1 ⁄
2
360° turns in an area
free from large metal objects or power lines. When the
compass has been calibrated, the CAL symbol will turn
off and the compass will function normally.
Compass Variation Adjustment
Compass Variance is the difference between magnetic
north and geographic north. In some areas of the country,
the difference between magnetic and geographic north is
great enough to cause the compass to give false readings.
If this occurs, the compass variance must be set according
to the Compass Variance Map.
NOTE: When the mirror is in the VAR mode, the letter
“Z” will be displayed along with the currently selected
zone number.
48 UNDERSTANDING THE FEATURES OF YOUR VEHICLE