Acura TSX / Honda Accord CL. Manual — part 63

Fig. 37: HDS Inputs & Commands Table (8 Of 8)

CIRCUIT DIAGRAM

2004 Acura TSX

2004 ACCESSORIES & EQUIPMENT Multiplex Integrated Control System - TSX

Fig. 38: Multiplex Integrated Control System Wiring Diagram (1 Of 2)

2004 Acura TSX

2004 ACCESSORIES & EQUIPMENT Multiplex Integrated Control System - TSX

Fig. 39: Multiplex Integrated Control System Wiring Diagram (2 Of 2)

DTC TROUBLESHOOTING

DTC B1000: COMMUNICATION BUS LINE ERROR

1. Clear the DTCs using the HDS.

2. Cycle the ignition switch to OFF and then back ON.

2004 Acura TSX

2004 ACCESSORIES & EQUIPMENT Multiplex Integrated Control System - TSX

3. Check for DTCs using the HDS.

Is DTC B1000 indicated?

YES: Go to step 4.

NO: Intermittent failure. The communication bus line is OK at this time. Check for loose or
poor connections. If the connections are good, check the battery condition and the charging
system. See GENERATORS & REGULATORS .

4. Check for DTCs using the HDS.

Are DTC B1005, B1006, B1007, B1008, B1009 and B1010 indicated?

YES: Go to step 5.

NO: Replace the MICU.

5. Disconnect each control unit one at a time. Clear the DTC, then recheck for DTCs after each unit is

disconnected.

z

Gauge control module

z

Relay control module

z

Driver's multiplex control unit

z

Climate control unit

z

Combination switch control unit

Is DTC B1000 indicated with each unit disconnected?

YES: Check for a short to power or ground in the communication circuit by
disconnecting the harness at each control unit and testing for continuity to ground or
short to power. Repair or replace the harness as necessary.

NO: Replace the control unit that was disconnected, and did not set DTC B1000.

DTC B1050, B1100, B1150, B1200, B1250: COMMUNICATION BUS LINE ERROR

1. Clear the DTCs using the HDS.

2. Cycle the ignition switch to OFF and then back ON.

3. Check for DTCs using the HDS.

Are DTC(s) B1050, B1100, B1150, B1200 or B1250 indicated?

YES: Go to step 4.

NO: Intermittent failure, the system is OK at this time.

2004 Acura TSX

2004 ACCESSORIES & EQUIPMENT Multiplex Integrated Control System - TSX