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Pinpoint Test Ag: The Compass Is Inaccurate (Without Sync®): Notes

Pinpoint Test AG: The Compass Is Inaccurate (Without SYNC®) 

Normal Operation 

The Instrument Panel Cluster (IPC) receives the compass display message from the Body Control Module (BCM) over the High Speed Controller Area Network (HS-CAN). The BCM receives the compass display message from the auto-dimming interior mirror over the Local Interconnect Network (LIN). The BCM is only a gateway for the compass information and does not control the compass display. The auto-dimming interior mirror receives voltage from the BCM fuse 32 (15A). The magnetic fields generated by the earth's north and south poles are divided into zones that differ from each other with respect to how the magnetic fields appear. The magnetic north can change by up to 4 degrees between zones and become noticeable across multiple zones. Set the compass zone to the correct zone for the compass to read accurately. Factors within the vehicle may affect the ability of the compass module to accurately read the magnetic north. Calibrating the compass allows the auto-dimming interior mirror to compensate for vehicle factors that influence the accuracy of the compass.

NOTE: Outside factors such as bridges, steel structures, tall buildings and power lines also affect compass accuracy.

This pinpoint test is intended to diagnose the following: 

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