Pinpoint Test B: The Compass Is Inaccurate

Electronic Compass

Pinpoint Tests


Pinpoint Test B: The Compass Is Inaccurate

NOTE: This procedure is only applicable to vehicles without navigation. If the compass display is inaccurate on a vehicle with navigation, install a new Front Display Interface Module (FDIM). Refer to Accessories and Optional Equipment.

Normal Operation

When calibrated correctly, the compass module (integral to the auto-dimming interior mirror) provides vehicle directional inputs to the Instrument Panel Cluster (IPC) which sends the compass information to the FDIM over the Medium Speed Controller Area Network (MS-CAN). The FDIM displays the vehicle heading based on the selected zone setting.

This pinpoint test is intended to diagnose the following:

- Compass zone setting
- Compass calibration
- Compass module (integral to the auto-dimming interior mirror)



PINPOINT TEST B: THE COMPASS IS INACCURATE

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

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B1 CHECK THE COMPASS ACCURACY


- Set the zone. Refer to Compass Zone Adjustment Compass Zone Adjustment.
- Calibrate the compass. Refer to Compass Calibration Compass Calibration.
- Observe the compass display with the vehicle pointing in several different directions, as follows:





- Does the compass display correctly for each direction?

Yes
The compass is OK. The concern may have been caused by an incorrect zone setting, or the compass was out of calibration.

No
INSTALL a new compass module. REFER to Auto-Dimming Interior Mirror in Mirrors. SET the zone. REFER to Compass Zone Adjustment Compass Zone Adjustment. CALIBRATE the compass. REFER to Compass Calibration Compass Calibration. TEST the system for normal operation.

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