Test B: The Message Center Switch Does Not Operate Correctly

PINPOINT TEST B: THE MESSAGE CENTER SWITCH DOES NOT OPERATE CORRECTLY

B1-B2:

B3-B5:

B6:

Normal Operation
The message center is located in the center of the instrument cluster between the tachometer and the speedometer in the vacuum fluorescent display area. The message center is integral to the instrument cluster and uses the same voltage supply as the instrument cluster. The RUN/START voltage is supplied to the instrument cluster on circuit CBP29 (WH/VT) and the keep alive B+ voltage is received on circuit SBP26 (YE/RD). The instrument cluster ground is received through circuit GD133 (BK). The message center functionality is controlled through the message center switch, which is hardwired to the instrument cluster through input circuit CMC29 (GN/VT) and return circuit RMC27 (WH/BN).

DTC B1209 - is an on-demand DTC that sets if the instrument cluster detects any of the message center switch buttons stuck during the self-test.

Possible Causes
- Circuitry
- Message center switch
- Instrument cluster