RAM 2500 Truck 2WD L6-5.9L DSL Turbo VIN C (2002)
Compass: Adjustments
Compass Variance
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.
COMPASS VARIATION SETTING
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Turn the ignition ON and set display to Comp./Temp.
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Simultaneously press both the US/M and STEP button for 0.1 to 2 seconds. The VAR indicator will light up and the current zone number will be
displayed.
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Press STEP button to select the proper variance zone as shown on the map. After 5 seconds of inactivity the displayed zone will be automatically
set, and normal operation will resume.
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 must be set. There are two methods that can be used to enter this information into the compass mini-trip computer module. They are
the zone method and the direct method.
Fig. 2 Variance Settings
Zone Method
1. Using the Variance Settings map, find your geographic location and note the zone number (Fig.2).
2. Turn the ignition switch to the ON position. If the compass/temperature data is not currently being displayed, momentarily depress and release the
Step push button to step through the display options until you have reached the compass/temperature display.
3. Depress both the U.S./Metric and the Step push buttons at the same time and hold them down for more than 100 milliseconds, but not more than
one second. The compass mini-trip computer will enter the variation adjustment mode and "VAR" along with the current variance zone will
appear in the display.
4. Momentarily depress and release the Step push button to step through the zone numbers, until the zone number for your geographic location
appears in the display.
5. After five seconds, the displayed zone will automatically be set in the compass mini-trip computer module memory and normal operation will
resume.
6. Confirm that the correct directions are now indicated by the compass.
Direct Method
1. Turn the vehicle so it is headed in either the north or south direction. The vehicle must be headed within 45 degrees of north or south for this
procedure to work. The vehicle may be moving or stationary.
2. Turn the ignition switch to the ON position. If the compass/temperature data is not currently being displayed, momentarily depress and release the