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. For vehicles with navigation, refer to Accessories and Optional Equipment.

Normal Operation

The compass module (integral to the auto-dimming interior mirror) provides vehicle directional inputs over circuits VMC31 and VMC30 to the Instrument Panel Cluster (IPC), which sends the compass information to the Front Display Interface Module (FDIM) (compass display) over the Medium Speed Controller Area Network (MS-CAN). The FDIM displays the compass direction according to the information that has been provided by the compass module to the IPC.

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.

NOTE: After installing a new compass module, always set the zone and calibrate the compass.

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B1 CHECK THE COMPASS ZONE ADJUSTMENT


- Carry out the compass zone adjustment procedure. Refer to Compass Zone Adjustment Compass Zone Adjustment.
- Does the compass zone set correctly?

Yes
GO to B2.

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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B2 CALIBRATE THE COMPASS


- Carry out the compass calibration adjustment procedure. Refer to REFER to Compass Calibration Compass Calibration.
- Does the compass calibrate correctly?

Yes
GO to GO to B3.

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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B3 CHECK THE COMPASS ACCURACY


- Position the vehicle and observe the compass display as follows:





- Does the compass display as indicated?

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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