Grand Cherokee 2WD V8-4.7L VIN J (2004)
Driver/Vehicle Information Display: Programming and Relearning
Compass Calibration
STANDARD PROCEDURE
CAUTION: Do not place any external magnets, such as magnetic roof mount antennas, in the vicinity of the compass. Do not use magnetic tools when
servicing the overhead console.
The electronic compass unit features a self-calibrating design, which simplifies the calibration procedure. This feature automatically updates the compass
calibration while the vehicle is being driven. This allows the compass unit to compensate for small changes in the residual magnetism that the vehicle
may acquire during normal use. If the compass readings appear to be erratic or out of calibration, perform the following calibration procedure. Also, new
service replacement Electronic Vehicle Information Center (EVIC) modules must have their compass calibrated using this procedure. Do not attempt to
calibrate the compass near large metal objects such as other vehicles, large buildings, or bridges; or, near overhead or underground power lines.
NOTE: Whenever an EVIC module is replaced, the variance number must also be reset. Refer to Compass Variation Adjustment.
Calibrate the compass manually as follows:
1. Turn the ignition switch to the On position. If the compass/temperature data is not currently being displayed, momentarily depress and release the
C/T push button to reach the compass/temperature display.
2. Depress the Reset push button and hold the button down until "CAL" appears in the display. This takes about ten seconds, and appears about five
seconds after "VARIANCE = XX" is displayed.
3. Release the Reset push button.
4. Drive the vehicle on a level surface, away from large metal objects and power lines, through one complete circle at between five and eight
kilometers-per-hour (three and five miles-per-hour) in not less than 20 seconds. The "CAL" message will disappear from the display to
indicate that the compass is now calibrated.
NOTE:
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If the "CAL" message remains in the display, either there is excessive magnetism near the compass, or the unit is faulty. Repeat the calibration
procedure one more time.
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If the wrong direction is still indicated in the compass display, the area selected for calibration may be too close to a strong magnetic field. Repeat
the calibration procedure in another location.
STANDARD PROCEDURE- COMPASS VARIATION ADJUSTMENT
Compass variance, also known as magnetic declination, is the difference in angle between magnetic north and true geographic north In some geographic
locations, the difference between magnetic and geographic north is great enough to cause the compass to give false readings If this problem occurs, the
compass variance setting may need to be changed
To set the compass variance