Acura TSX / Honda Accord CL. Manual - part 57

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Gauge control module  

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Safety indicators  

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Chimes (key, seat belt and lights ON)  

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Security  

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Keyless entry  

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Climate control  

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Key interlock  

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Dash light brightness  

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Audio System  

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Navigation  

5. Record all DTCs and sort them by DTC type using the DTC troubleshooting Index.  

6. Troubleshoot the DTC(s) in the following order: 

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Battery voltage DTCs.  

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Internal error DTCs.  

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Loss of communicator DTCs. Begin troubleshooting with the lowest number first (Example: if 
DTC B1006 and B1058 are retrieved, begin by troubleshooting B1006).  

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Signal error DTCs.  

B-CAN SYSTEM DIAGNOSIS TEST MODE B 

1. Using the Honda Diagnostic System (HDS), select the system that has the symptom from the BODY 

ELECTRICAL MENU.  

2. Select DTCs, and then check for loss of communication DTCs (use the DTC Troubleshooting Index to 

find the DTC type). 

Are loss of communication DTCs indicated? 

YES: Go to step 3.  

NO: Replace the MICU.  

3. Perform the input test for the unit not communicating with the HDS. 

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MULTIPLEX INTEGRATED CONTROL UNIT INPUT TEST  

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GAUGE CONTROL MODULE INPUT TEST  

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DOOR MULTIPLEX CONTROL UNIT INPUT TEST  

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COMBINATION SWITCH CONTROL UNIT INPUT TEST  

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RELAY CONTROL MODULE INPUT TEST

NOTE:

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Perform this diagnosis if any of the control units are not communicating 
(NONE displayed in the HDS.) as found by the B-CAN system Diagnosis 
Test Mode A.  

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Always cycle the ignition switch within 3 seconds when prompted in the 
DTC troubleshooting procedures in this section.  

 

2004 Acura TSX 

2004 ACCESSORIES & EQUIPMENT Multiplex Integrated Control System - TSX

  

 

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DTC B1205: CLIMATE CONTROL UNIT LOST COMMUNICATION WITH THE 
GAUGE CONTROL MODULE (VSP/NE MESSAGES); DTC B1206: CLIMATE 
CONTROL UNIT LOST COMMUNICATION WITH THE GAUGE CONTROL MODULE 
(ECT MESSAGES); DTC B1207: CLIMATE CONTROL UNIT LOST COMMUNICATION 
WITH THE GAUGE CONTROL MODULE (ILLUMI MESSAGES)  

B-CAN SYSTEM DIAGNOSIS TEST MODE C 

1. Check for DTCs by selecting the TEST MODE MENU from the Honda Diagnostic System (HDS). 

Are any DTCs indicated? 

YES: Go to B-CAN System Diagnosis Test Mode A.  

NO: Go to step 2.  

2. Turn OFF the switch that controls the malfunctioning component.  

3. Select DATA LIST from the TEST MODE MENU, and check the input of the switch that controls the 

component. 

Does the tester indicate the switch is OFF? 

YES: Go to step 4.  

NO: Go to step 6 .  

4. In the DATA LIST of, check the output signal of the malfunctioning component. 

Is the output signal OFF? 

YES: Go to step 5.  

NO: Replace the control unit that controls the device that will not turn OFF (see B-CAN 
SYSTEM SWITCH DEVICE INDEX ).  

5. Check the relay if applicable, then check for a short in the wire between the relay and the component, 

relay and control unit or the component and control unit. 

Are the relay and the wire harness OK? 

YES: Replace the control unit that controls the component that will not turn OFF.  

NO: Replace the relay or repair the wire harness.  

6. Check the switch, then check for a short in the wire between the switch and the control unit that monitors 

the switch. 

Is the switch and wire harness OK?

NOTE:

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Perform this diagnosis if a component that is controlled by the B-CAN 
system does not stop or does not turn off.  

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If the component does not turn ON, go to B-CAN System Diagnosis Test 
Mode D.  

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See the B-CAN system unit input/output index for a list of input and output 
devices and the control units that monitor the input and controls the 
output devices (see B-CAN SYSTEM SWITCH DEVICE INDEX ).  

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Always cycle the ignition switch within 3 seconds when prompted in the 
DTC troubleshooting procedures in this section.  

 

2004 Acura TSX 

2004 ACCESSORIES & EQUIPMENT Multiplex Integrated Control System - TSX

  

 

YES: Replace the control unit that monitors the switch.  

NO: Replace the switch or repair the wire harness.  

B-CAN SYSTEM DIAGNOSIS TEST MODE D 

1. Check the fuse of the malfunctioning output device. 

Is the fuse OK? 

YES: Go to step 2.  

NO: Replace the fuse and recheck.  

2. Check for DTCs by selecting the TEST MODE MENU from the Honda Diagnostic System (HDS). 

Are any DTCs indicated? 

YES: Go to B-CAN System Diagnosis Test Mode A.  

NO: Go to step 3.  

3. Turn ON the switch that controls the malfunctioning component.  

4. Select DATA LIST from the TEST MODE MENU, and check output signal for the malfunctioning 

component. 

Is there an output signal? 

YES: Go to step 5.  

NO: Go to step 9 .  

5. Check the relay and ground, then check for an open or a short in the circuit for the malfunctioning 

component. 

Are the relay and circuit OK? 

YES: Go to step 6.  

NO: Replace the relay or repair the wire circuit.  

6. Perform the function test for the malfunctioning component. 

Does the output device pass the function test? 

YES: Go to step 7.  

NO: Replace the component.  

7. With the malfunctioning output component, connect a voltmeter between the malfunctioning component 

and body ground on the wire that the control unit uses to control the component circuit.  

NOTE:

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Perform this diagnosis a component that is controlled by the B-CAN 
system does not run or does not come on.  

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If the component does not turn off or does not stop, go to B-CAN System 
Diagnosis Test Mode C.  

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See the B-CAN system unit input/output index for a list of input and output 
devices and the control units that monitor the input and controls the 
output devices (see B-CAN SYSTEM SWITCH DEVICE INDEX ).  

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Always cycle the ignition switch within 3 seconds when prompted in the 
DTC troubleshooting procedures in this section.  

 

2004 Acura TSX 

2004 ACCESSORIES & EQUIPMENT Multiplex Integrated Control System - TSX

  

 

8. Select MISC. TEST from the TEST MODE MENU, and do the forced operation test of the 

malfunctioning component. 

Is there a change in voltage (12 V to 0 V or 0 V to 12 V)? 

YES: Replace the component.  

NO: Replace the control unit that controls the malfunctioning component.  

9. Select DATA LIST from the TEST MODE MENU, and make sure the switch signal input for the 

malfunctioning system indicates a change when operated. 

Does the switch input indicate ON when the switch is ON? 

YES: Replace the control unit that controls the malfunctioning component.  

NO: Go to step 10.  

10. Check the switch and its ground (if applicable), then check for an open or a short in the wire between the 

switch and the control unit that monitors it. 

Is the switch and the wire harness OK? 

YES: Replace the control unit that monitors the switch.  

NO: Replace the switch or repair the wire harness.  

B-CAN SYSTEM DIAGNOSIS TEST MODE 1 (TROUBLESHOOTING WITHOUT THE HDS) 

1. Check the No. 7 (10A) fuse and No. 21 (7.5A) fuse in the under-dash fuse/relay box. 

Are the fuses OK? 

YES: Go to step 2.  

NO: Find and repair the cause of the blown fuse.  

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

3. Turn the ignition switch ON (II).  

4. Connect the MPCS Service connector (A) to the MCIC socket (B) in the under-dash fuse/relay box. 

 

2004 Acura TSX 

2004 ACCESSORIES & EQUIPMENT Multiplex Integrated Control System - TSX