RAM 2500 Truck 4WD V8-5.9L VIN Z LDC (1998)
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
demagnetizing and calibration procedures at least 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.
Compass Demagnetizing
A degaussing tool (Special Tool 6029) is used to demagnetize, or degauss, the roof panel. Equivalent units must be rated as continuous duty for 110/115
volts and 60 Hz. They must also have a field strength of over 350 gauss at 7 millimeters (0.25 inch) beyond the tip of the probe.
To demagnetize the roof panel, proceed as follows:
1. Be certain the ignition switch is in the Off position, before you begin the demagnetizing procedure.
Roof Demagnetizing Pattern
2. Place a piece of paper approximately 22 by 28 centimeters (8.5 by 11 inches), oriented on the vehicle lengthwise from front to rear, on the center
line of the roof at the windshield header. The purpose of the paper is to protect the roof panel from scratches, and to define the area to be
demagnetized.
3. Plug in the degaussing tool, while keeping the tool at least 61 centimeters (2 feet) away from the compass unit.
4. Slowly approach the center line of the roof panel at the windshield header, with the degaussing tool plugged in.
5. Contact the roof panel with the plastic coated tip of the degaussing tool. Be sure that the template is in place to avoid scratching the roof panel.
Using a slow, back-and-forth sweeping motion, and allowing 13 millimeters (0.50 inch) between passes, move the tool at least 11 centimeters (4
inches) to each side of the roof center line, and 28 centimeters (11 inches) back from the windshield header.
6. With the degaussing tool still energized, slowly back it away from the roof panel. When the tip of the tool is at least 61 centimeters (2 feet) from
the roof panel, unplug the tool.
7. Calibrate the compass and adjust the compass variance as described in the Service Procedures.
