Pinpoint Test BI: The Compass Is Inaccurate

Instrumentation, Message Center and Warning Chimes

Pinpoint Test BI: 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 (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 BI : 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.

BI1 CHECK THE COMPASS ZONE ADJUSTMENT

- Carry out the compass zone adjustment procedure. Refer to Compass Zone Adjustment .

Does the compass zone set correctly?

Yes
GO to BI2.

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.

BI2 CALIBRATE THE COMPASS

- Carry out the compass calibration adjustment procedure. Refer to Compass Calibration .

Does the compass calibrate correctly?

Yes
GO to BI3.

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.

BI3 CHECK THE COMPASS ACCURACY

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

Direction Compass Display North N Northeast NE East E Southeast SE South S Southwest SW West W Northwest NW

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.