Test B: The Message Center Switch Does Not Operate Correctly

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

B1-B2:

B2-B4:

B5-B6:

Normal Operation
The message center functionality is controlled through the message center switches, which are hardwired to the instrument cluster. The instrument cluster monitors the message center switch input by sending reference signals through circuits 143 (LB/YE) and 152 (LB/WH). The message center switch return signal is routed back to the instrument cluster through circuit 1411 (GY/OG).

DTC B1205 - is a continuous or on-demand DTC that sets if the instrument cluster detects a stuck RESET or SETUP switch, or a switch that has been pressed for longer than 2 minutes, on circuit 143 (LB/YE).

DTC B1206 - is a continuous or on-demand DTC that sets if the instrument cluster detects an open on circuit 143 (LB/YE).

DTC B1208 - is a continuous or on-demand DTC that sets if the instrument cluster detects a short to ground on circuit 143 (LB/YE).

DTC B1209 - is a continuous or on-demand DTC that sets if the instrument cluster detects a stuck INFO or SELECT switch, or a switch that has been pressed for longer than 2 minutes, on circuit 152 (LB/WH).

DTC B1210 - is a continuous or on-demand DTC that sets if the instrument cluster detects an open on circuit 152 (LB/WH).

DTC B1212 - is a continuous or on-demand DTC that sets if the instrument cluster detects a short to ground on circuit 152 (LB/WH).

Possible Causes
- Circuit 143 (LB/YE) open, short to ground or voltage
- Circuit 152 (LB/WH) open, short to ground or voltage
- Circuit 1411 (GY/OG) open or short to voltage
- Message center switch
- Instrument cluster