Acura TSX / Honda Accord CL. Manual - part 58

 

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Acura TSX / Honda Accord CL. Manual - part 58

 

 

Fig. 15: Connecting The MPCS Service Connector To The MCIC Socket In The Under-Dash 
Fuse/Relay Box
 

5. Wait 5 seconds, then watch the ceiling light.  

6. If there is a DTC, the ceiling light and ignition switch light will blink, pause, then repeat the DTC as long 

 

2004 Acura TSX 

2004 ACCESSORIES & EQUIPMENT Multiplex Integrated Control System - TSX

  

 

as the ignition switch ON (II). 

Is there a repeating DTC? 

YES: Count the blinks, then go to step 7.  

NO: Go to step 8 .  

7. About 1 second after you go into self-diagnosis Mode 1, the ceiling light will indicate the DTC, and 

repeat it every 3 seconds. If there is more than one DTC, the system will indicate them in ascending 
order, beginning from the DTC with the lowest numerical value. Troubleshoot the DTCs as indicated 
below: 

z

DTC 2, 3, 4 And 5 Simultaneously: Check for an open in the BLU wire between multiplex 
integrated control unit D11 and relay module J7, BRN/RED wire between multiplex integrated 
control unit J4 and door multiplex control unit No. 16, LT GRN wire between multiplex integrated 
control unit X27 and combination switch control unit No. 4, BRN/YEL wire between multiplex 
integrated control unit N28 and gauge B25. If the wire is OK, substitute a known-good under-dash 
fuse/relay box (multiplex integrated control unit), under-hood fuse/relay box, power window 
master switch, wiper/washer switch and gauge one at a time, in that order, and recheck for the 
DTCs after each substitution.  

z

DTC 1 Only: Go to MICU input test (see MULTIPLEX INTEGRATED CONTROL UNIT 
INPUT TEST
 ).  

z

DTC 2 Only (No Other DTCs Present): Go to the relay module input test. If all inputs are OK, 
substitute a known-good relay module and then a MICU, one at a time, and then check for DTCs. If 
a DTC recurs after a substitution, replace that unit.  

z

DTC 3 Only (No Other DTCs Present): Go to the door multiplex control unit input test. If all 
inputs are OK, substitute a known-good door multiplex control unit and then a MICU, one at a 
time, and then check for DTCs. If a DTC recurs after a substitution, replace that unit.  

z

DTC 4 Only (No Other DTCs Present): Go to the combination switch control unit input test. If 
all inputs are OK, substitute a known-good wiper/washer switch and then a MICU, one at a time, 
and then check for DTCs. If a DTC recurs after a substitution, replace that unit.  

z

DTC 5 Only (No Other DTCs Present): Go to the gauge control module input test. If all inputs 
are OK, substitute a known-good gauge control module and then a MICU, one at a time, and then 
check for DTCs. If a DTC recurs after a substitution, replace that unit.  

 

2004 Acura TSX 

2004 ACCESSORIES & EQUIPMENT Multiplex Integrated Control System - TSX

  

 

Fig. 16: DTC Table 

8. Check for B-CAN DTCs indicated by the gauge control module while still in Test Mode 1. 

Are any DTCs indicated? 

YES: Go to step 9.  

NO: Go to step 11 .  

9. Record all DTCs and sort them by type using the DTC Troubleshooting Index.  

10. Troubleshoot the DTCs in the following order: 

z

Battery voltage DTCs  

z

Internal error DTCs  

z

Loss of communication DTCs (begin with the lowest number first; for example, if B1006 and 
B1059 are retrieved, troubleshoot B1006 first)  

z

Signal error DTCs  

11. Remove the MPCS service connector from the under-dash fuse/relay box socket for 5-10 seconds, then 

re-insert it. 

NOTE:

If the MPCS connector is disconnected for too short or too long of a time, 
or the ignition switch is turned OFF, the system will return to Test Mode 2.

 

2004 Acura TSX 

2004 ACCESSORIES & EQUIPMENT Multiplex Integrated Control System - TSX

  

 

12. In the table below is a list of circuits that can be checked in Test Mode 2. Operate the switch that is most 

closely related to the problem. If the circuit is OK, the ceiling light will blink once. If the circuit is faulty, 
there will be no indication. 

Does the ceiling light indicate proper switch operation? 

YES: Go to function and input test for the system related to the failure.  

NO: Repair the open, short, or replace the faulty switch.  

Fig. 17: MICU Table 

 

2004 Acura TSX 

2004 ACCESSORIES & EQUIPMENT Multiplex Integrated Control System - TSX

  

 

 

 

 

 

 

 

 

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