Refer to PDU User Guide

The complexity of the electronics involved with the speedometer and instrument cluster, of which the Message Center is a part, and the two multiplexed communication networks which are connected to it preclude the use of workshop general electrical test equipment. Therefore, reference should be made to the PDU User Guide for detailed instructions on testing the speedometer and odometer.

The PDU systematically tests and analyses all functions and the various systems affected by it.

Where a fault is indicated, before replacing a component, some basic diagnostic methods may be necessary to confirm that connections are good and that wiring is not damaged.