Test B: The Compass Is Inaccurate

PINPOINT TEST B: THE COMPASS IS INACCURATE

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 compass display (FDIM) is supplied through circuit GD114 (BK/BU). The compass module (located on the interior rear view mirror) provides vehicle directional inputs to the instrument cluster, which sends the compass information to the FDIM over the medium speed controller area network (MS-CAN). The FDIM will display the compass direction according to the information that has been provided by the compass module to the instrument cluster.

This pinpoint test is intended to diagnose the following:
- Magnetized vehicle
- Compass zone setting
- Compass calibration
- Compass module

B1-B2:

B2 Continued: