Normal Operation

The compass display (located in the Front Display Interface Module (FDIM)) receives battery voltage from the Smart Junction Box (SJB) fuse 14 (10A) through circuit SBP14 (BN/RD). Ground for the FDIM  is supplied through circuit GD114 (BK/BU). The compass module (integral to the auto-dimming interior mirror) provides vehicle directional inputs over circuits VMC31 (GY/BU) and VMC30 (BU/GY) to the Instrument Cluster (IC), 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 IC  .

• DTC U0161:00 (Lost Communication With Compass Module: No Sub Type Information) - sets when the IC  does not receive any communication from the compass module for 5 seconds or longer.
• DTC U0462:00 (Invalid Data Received From Compass Module: No Sub Type Information) - sets when the IC  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)
• IC