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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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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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