Acura TSX / Honda Accord CL. Manual - part 127

Fig. 17: Multiplex Integrated Control Unit Input Test (2 Of 2 - Connected) 

Door Multiplex Control Unit: 

7. Remove the driver's power window switch panel (see FRONT DOOR PANEL 

REMOVAL/INSTALLATION ).  

8. Disconnect the 23P connector from the power window master switch. 

 

2004 Acura TSX 

2004 ACCESSORIES & EQUIPMENT Keyless Entry/Security Alarm System - TSX

  

 

Fig. 18: Identifying Door Multiplex Control Unit Connector Terminals 

9. Inspect the connector and socket terminals to be sure they are all making good contact. 

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If the terminals are bent, loose or corroded, repair them as necessary, and recheck the system.  

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If the terminals look OK, go to step 10.  

10. Reconnect the connector to the door multiplex control unit, and make these input tests at the connectors. 

See Fig. 19 . 

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If any test indicates a problem, find and correct the cause, then recheck the system.  

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If all the input tests prove OK, go to step 11. 

 

2004 Acura TSX 

2004 ACCESSORIES & EQUIPMENT Keyless Entry/Security Alarm System - TSX

  

 

Fig. 19: Door Multiplex Control Unit Input Test 

11. If all the input tests prove OK, and no DTCs were found during MICS troubleshooting (B-CAN System 

Diagnosis Test Mode A), go to the B-CAN system input and output index. If multiple failures are found 
on more than one control unit, replace the under-dash fuse/relay box (includes the MICU). If input 
failures are related to a particular control unit, replace that control unit.  

DTC TROUBLESHOOTING 

DTC B1026: PASSENGER'S DOOR LOCK SWITCH SIGNAL ERROR 

1. Clear the DTCs using the HDS.  

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

3. Operate the passenger's door lock switch.  

4. Check for DTCs using the HDS. 

Is DTC B1026 Indicated? 

YES: Go to step 5.  

NO: Intermittent failure. The passenger's door lock system is OK at this time. Check pin fits 

 

2004 Acura TSX 

2004 ACCESSORIES & EQUIPMENT Keyless Entry/Security Alarm System - TSX

  

 

and connections.  

5. With the door lock in UNLOCK position, select SECURITY from the HDS and enter the DATA LIST.  

6. Check the ON/OFF information of the Front Psnger's Door Lock Sw. (LOCK) and Front Psnger's Door 

Lock Sw. (UNLOCK) in the DATA LIST. 

Are both information indicators OFF? 

YES: Go to step 7.  

NO: Go to step 9 .  

7. Make sure the ON/OFF information of the Front Psnger's Door Lock Sw. (LOCK) and Front Psnger's 

Door Lock Sw. (UNLOCK) are changed when the passenger's door lock switch is in the LOCK and 
UNLOCK positions. 

Does the information show the correct ON and OFF indications when the door lock switch in 
the LOCK and UNLOCK positions? 

YES: Intermittent failure, the switch, harness and MICU input circuits are OK at this time. 
Check pin fits and connections.  

NO: Go to step 8.  

8. Check for an open in the wire between the MICU and passenger's door lock switch at the security 

alarm/keyless door lock system control unit input test (see CONTROL UNIT INPUT TEST ). 

Are the wire harnesses OK? 

YES: Faulty passenger's door lock switch; replace it.  

NO: An open in the wire, repair and recheck.  

9. Remove the passenger's inner handle (see DOORS ).  

10. Disconnect the 3P connector from the passenger's door lock switch.  

11. Check the ON/OFF information of the Front Psnger's Door Lock Sw. (LOCK) and Front Psnger's Door 

Lock Sw. (UNLOCK) in the DATA LIST. 

Are both information indicators OFF? 

YES: Faulty passenger's door lock switch; replace it.  

NO: Go to step 12.  

12. Check for a short in the wire between the MICU and passenger's door lock switch at the security 

alarm/keyless door lock system control unit input test (see CONTROL UNIT INPUT TEST ). 

Are the wire harnesses OK? 

YES: Faulty MICU; replace it.  

NO: A short in the wire, repair and recheck.  

DTC B1127: DRIVER'S DOOR KEY CYLINDER SWITCH SIGNAL ERROR 

1. Clear the DTCs using the HDS.  

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

3. Operate the driver's door key cylinder.  

4. Check for DTCs using the HDS. 

Is DTC B1127 indicated? 

 

2004 Acura TSX 

2004 ACCESSORIES & EQUIPMENT Keyless Entry/Security Alarm System - TSX