Acura TSX / Honda Accord CL. Manual — part 64

Fig. 40: DTC Table

4. Check for DTCs using the HDS.

Is DTC(s) B1000 indicated?

YES: Troubleshoot DTC B1000.

NO: If DTC B1050 is indicated, replace the relay control module. If DTC B1100 is
indicated, replace the door multiplex control unit. If DTC B1150 is indicated, replace the
gauge control module (see GAUGE CONTROL MODULE REPLACEMENT ). If DTC
B1200 is indicated, replace the climate control unit. If DTC B1250 is indicated, replace the
combination switch control unit.

DTC B1001, B1002: MULTIPLEX INTEGRATED CONTROL UNIT (MICU) INTERNAL ERROR

1. Clear the DTCs using the HDS.

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

3. Operate the door lock (LOCK/UNLOCK).

4. Check for DTCs using the HDS.

Is DTC B1001 or B1002 indicated?

YES: Faulty MICU; replace the under-dash fuse/relay box.

NO: Intermittent failure, the 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 .

DTC B1005: MICU LOST COMMUNICATION WITH RELAY 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 B1005 indicated?

YES: Go to step 4.

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2004 ACCESSORIES & EQUIPMENT Multiplex Integrated Control System - TSX

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

Is DTC B1158 indicated?

YES: Go to Relay Control Module Input Test (see RELAY 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 relay 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 B1006: MICU LOST COMMUNICATION WITH DOOR MULTIPLEX CONTROL UNIT DOOR
LOCK 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 B1006 indicated?

YES: Go to step 2.

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 in the gauge control module and relay module using the HDS.

Is DTC B1160 and B1058 indicated?

YES: Go to 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 B1007: MICU LOST COMMUNICATION WITH THE COMBINATION SWITCH CONTROL
UNIT (HEADLIGHT 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 B1007 indicated?

YES: Go to step 4.

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

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2004 ACCESSORIES & EQUIPMENT Multiplex Integrated Control System - TSX

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.

2004 Acura TSX

2004 ACCESSORIES & EQUIPMENT Multiplex Integrated Control System - TSX