Overhead Console - Service Information: Adjustments Dodge Dakota III рестайлинг

MANUAL COMPASS CALIBRATION

Note. Whenever the compass is calibrated manually, the variance number must also be reset. See Electrical/Overhead Console/MODULE, Compass and Mini-Trip Computer - Standard Procedure for the appropriate procedure.

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 Compass Mini-Trip Computer (CMTC) 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.

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 (5) to return to the compass/temperature display.
2. Depress and hold the RESET push button (2). Hold the push button down until "CAL" appears in the display. This takes about ten seconds.
3. Slowly drive the vehicle on a level surface, away from large metal objects and power lines, through one or two complete circles not exceeding 8 km/h (5 mph). The "CAL" message will disappear from the display to indicate that the compass is now calibrated. NOTE: A blank compass display indicates that vehicle degaussing (demagnetizing) may be necessary. NOTE: If the "CAL" message remains in the display, either there is excessive magnetism near the compass, or the CMTC is inoperative. Attempt the calibration procedure at least one more time before performing CMTC diagnosis. NOTE: 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.

Scheme 40

A degaussing tool (Special Tool 6029) is used to demagnetize, or degauss, the overhead console forward mounting screw and the roof panel above the overhead console. 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 and the overhead console forward mounting screw, proceed as follows

Scheme 41

1. Be certain that the ignition switch is in the Off position, before you begin the demagnetizing procedure.
2. Connect the degaussing tool to an electrical outlet, while keeping the tool at least 61 centimeters (2 feet) away from the compass unit.
3. Slowly approach the head of the overhead console forward mounting screw with the degaussing tool connected.
4. Contact the head of the screw with the plastic coated tip of the degaussing tool for about two seconds.
5. With the degaussing tool still energized, slowly back it away from the screw. When the tip of the tool is at least 61 centimeters (2 feet) from the screw head, disconnect the tool.
6. 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.
7. Connect the degaussing tool to an electrical outlet, while keeping the tool at least 61 centimeters (2 feet) away from the compass unit.
8. Slowly approach the center line of the roof panel at the windshield header, with the degaussing tool connected.
9. 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.
10. 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, disconnect the tool.
11. Calibrate the compass and adjust the compass variance. See «Electrical/Overhead Console/MODULE, Compass and Mini-Trip Computer - Standard Procedure»(ref-352665-S12354242842010010600000) .

Scheme 42

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.

Note. If the vehicle is taken on long trips into a new variance zone the compass function may be effected. Compass variance may need to be adjusted to the new zone number to function properly.

Note. The default for the compass variance from the factory is 8.

To set the compass variance

1. Using the Variance Settings Map, find your geographic location and note the zone number.
2. Turn the ignition switch to the On/Run position. If the compass/temperature data is not currently being displayed, momentarily depress and release the C/T push button (5) to return to the compass/temperature display.
3. Press and hold the RESET push button (2) down for approximately five seconds. The last variance zone number will be displayed.
4. Momentarily depress and release the STEP push button (4) to toggle through the zone numbers (1-15), until the zone number for your geographic location appears in the display.
5. Momentarily depress and release the RESET push button (2) to enter the displayed zone number into the compass unit memory.
6. Confirm that the correct directions are now indicated by the compass.

Scheme 43

1. Disconnect and isolate the battery negative cable.
2. Remove the overhead console (3) from the headliner. See «Electrical/Overhead Console - Removal»(ref-352665-S39892635642010010600000) .
3. Remove the screws (1) that secure the Compass Mini - Trip Computer (CMTC) (4) to the overhead console housing (3).
4. Remove the CMTC (4) from the overhead console housing (3).