Normal Operation

The compass module (integral to the auto-dimming interior mirror) provides vehicle directional inputs over the compass communication circuits 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 compass direction according to the information that has been provided by the compass module to the IPC.

• DTC U0161:00 (Lost Communication With Compass Module: No Sub Type Information) - sets when the IPC does not receive any communication from the compass module for 5 seconds or longer.
• DTC U0462:68 (Invalid Data Received From Compass Module: Event Information) - sets when the IPC attempts a self-test of the compass module and its associated circuits and a failure results.

This pinpoint test is intended to diagnose the following: 

• Fuse(s)
• Wiring, terminals or connectors
• Compass module (integral to the auto-dimming interior mirror)
• FDIM (compass display)
• IPC