Pinpoint Test BM: The Compass Is Inaccurate

Instrumentation, Message Center and Warning Chimes

Pinpoint Test BM: The Compass Is Inaccurate

NOTE: This pinpoint test 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 the compass communication (+) and (-) circuits 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 (Front Display Interface Module) displays the compass direction according to the information that has been provided by the compass module to the IPC (Instrument Panel Cluster).

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 BM : 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.

BM1 CHECK THE COMPASS ACCURACY

- Set the zone. Refer to Compass Zone Adjustment .

- Calibrate the compass. Refer to Compass Calibration .

- 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. SET the zone. REFER to Compass Zone Adjustment . CALIBRATE the compass. REFER to Compass Calibration . TEST the system for normal operation.