Acura TSX / Honda Accord CL. Manual — part 153

Is DTC B1155 and B1062 indicated?

YES: Go to the Combination Switch Control Unit Input Test (see COMBINATION
SWITCH CONTROL UNIT INPUT TEST ).

NO: Check for an open, or a short to power or ground in the communication circuit between
the MICU and the combination switch control unit. If the circuit is OK, replace the MICU. If
the circuit is bad, repair the open, or short to power or ground.

DTC B1008: MICU LOST COMMUNICATION (A/T MESSAGE) WITH THE GAUGE CONTROL
MODULE

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.

Is DTC B1008 indicated?

YES: Go to step 4.

NO: Intermittent failure, the gauge control module 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 in the relay control module using the HDS.

Is DTC B1161 indicated?

YES: Go to the Gauge Control Module Input Test (see GAUGE CONTROL MODULE
INPUT TEST ).

NO: Check for an open, or a short to power or ground in the communication circuit between
the MICU and the gauge control module. If the circuit is OK, replace the MICU. If the circuit
is bad, repair the open, or short to power or ground.

DTC B1009: MICU LOST COMMUNICATION WITH THE COMBINATION SWITCH CONTROL
UNIT (WIPER/WASHER SWITCH MESSAGE)

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.

Is DTC B1009 indicated?

YES: Go to step 4.

NO: Intermittent failure, the combination switch control unit 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 of the gauge control module and relay control module using the HDS.

Is DTC B1156 and B1063 indicated?

YES: Go to the Combination Switch Control Unit Input Test (see COMBINATION
SWITCH CONTROL UNIT INPUT TEST ).

NO: Check for an open, or a short to power or ground in the communication circuit between

2004 Acura TSX

2004 ACCESSORIES & EQUIPMENT Multiplex Integrated Control System - TSX

the MICU and the combination switch control unit. If the circuit is OK, replace the MICU. If
the circuit is bad, repair the open, or short to power or ground.

DTC B1010: MICU LOST COMMUNICATION (PANIC MESSAGE) WITH THE DOOR
MULTIPLEX CONTROL UNIT

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.

Is DTC B1010 indicated?

YES: Go to step 4.

NO: Intermittent failure, the door multiplex control unit 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 of the relay control module using the HDS.

Is DTC B1059 indicated?

YES: Go to the Door Multiplex Control Unit Input Test (see DOOR MULTIPLEX
CONTROL UNIT INPUT TEST ).

NO: Check for an open, or a short to power or ground in the communication circuit between
the MICU and the door multiplex control unit. If the circuit is OK, replace the MICU. If the
circuit is bad, repair the open, or short to power or ground.

DTC B1102: DOOR MULTIPLEX CONTROL UNIT INTERNAL ERROR

1. Clear the DTCs using the HDS.

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

3. Operate the power window (UP/DOWN).

4. Check for DTCs using the HDS.

Is DTC B1102 indicated?

YES: Faulty door multiplex control unit; replace the power window master switch.

NO: Intermittent failure, the door multiplex control unit is OK at this time. Check for loose
for or poor connections. If the connections are good, check the battery condition and the
charging system. See GENERATORS & REGULATORS .

DTC B1178: F-CAN COMMUNICATION LINE ERROR; DTC B1168: GAUGE CONTROL MODULE
LOST COMMUNICATION WITH ECM/PCM (ENGINE MESSAGES); DTC B1169: GAUGE
CONTROL MODULE LOST COMMUNICATION WITH THE PCM (A/T MESSAGES)

1. Clear the DTCs using the HDS.

2. Turn the ignition switch OFF then back to the ON (II).

3. Start and run the engine for at least 5 seconds then turn the engine off.

4. Check for DTCs using the HDS.

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2004 ACCESSORIES & EQUIPMENT Multiplex Integrated Control System - TSX

Is DTC B1178, B1168 and/or B1169 indicated?

YES: Go to step 5.

NO: Intermittent failure, the F-CAN communication 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 .

5. Check for DTCs in the ECM/PCM.

Are any DTCs indicated?

YES: Troubleshoot the ECM/PCM DTCs.

NO: Go to step 6.

6. Perform the Gauge Control Module Input Test (see GAUGE CONTROL MODULE INPUT TEST ).

Are all inputs OK?

YES: Go to step 7.

NO: Repair the faulty input then recheck for DTCs.

7. Substitute a known-good gauge control module.

8. Clear the DTCs using the HDS.

9. Turn the ignition switch OFF then back to the ON (II).

10. Start and run the engine for at least 5 seconds then turn the engine off.

11. Check for DTCs using the HDS.

Is DTC B1178, B1168 and/or B1169 indicated?

YES: Replace the ECM/PCM.

NO: The original gauge control module is faulty; replace the gauge control module (see
GAUGE CONTROL MODULE REPLACEMENT ).

DTC B1080: POWER SUPPLY CIRCUIT (IG1 LINE) INPUT ERROR FOR RELAY CONTROL
MODULE & MICU

1. Clear the DTCs using the HDS.

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

3. Turn the ignition switch ON (II) and wait for 2 seconds or more.

Is DTC B1080 indicated again?

YES: Go to step 4.

NO: Intermittent failure, the relay control module 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 the MICU IG1 power supply No. 21 (7.5A) fuse in the under-dash fuse/relay box.

Is the fuse OK?

YES: Go to MICU Input Test (see MULTIPLEX INTEGRATED CONTROL UNIT
INPUT TEST ).

NO: Replace the fuse and recheck for DTCs.

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2004 ACCESSORIES & EQUIPMENT Multiplex Integrated Control System - TSX

DTC B1251: COMBINATION SWITCH CONTROL UNIT INTERNAL 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.

Is DTC B1251 indicated?

YES: Faulty combination switch control unit; replace the wiper/washer switch.

NO: Intermittent failure, the CPU in the combination switch control unit 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 .

DTC B1255: COMBINATION SWITCH CONTROL UNIT LOST COMMUNICATION WITH MICU

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.

Is DTC B1255 indicated?

YES: Go to step 4.

NO: Intermittent failure, MICU 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 in the combination switch control using the HDS.

Is DTC B1055 and B1157 indicated?

YES: Go to MICU input test (see MULTIPLEX INTEGRATED CONTROL UNIT
INPUT TEST ).

NO: Replace the combination switch control unit.

MULTIPLEX INTEGRATED CONTROL UNIT INPUT TEST

1. Remove the left side kick panel (see TRIM REMOVAL/INSTALLATION - DOOR AREA ).

2. Disconnect the under-dash fuse/relay box connectors D, E, H, I, J, K, N, P and X.

NOTE:

All connectors shown in Fig. 41 are wire side of female terminals.

2004 Acura TSX

2004 ACCESSORIES & EQUIPMENT Multiplex Integrated Control System - TSX