Acura TSX / Honda Accord CL. Manual - part 656

Fig. 47: Checking For Continuity Between Terminals Of Audio-HVAC Display Panel 
Connector A (22P) & The Driver's Air Mix Control Motor 7P Connector 

DTC INDICATOR J OR DTC B1234: A SHORT IN THE DRIVER'S AIR MIX CONTROL MOTOR 
CIRCUIT 

1. Clear the DTC.  

2. Turn the ignition switch OFF, and then ON.  

3. Operate the climate control system is several modes.  

4. Check the DTCs. 

Is DTC J or B1234 indicated? 

YES: Go to step 5.  

NO: Intermittent failure.  

5. Test the driver's air mix control motor (see DRIVER'S AIR MIX CONTROL MOTOR TEST ). 

Is the driver's air mix control motor OK? 

YES: Go to step 6.  

 

2004 Acura TSX 

2004 AUTOMATIC A/C SYSTEMS Climate Control System - TSX

  

 

NO: Replace the driver's air mix control motor.  

6. Disconnect the driver's air mix control motor 7P connector.  

7. Disconnect audio-HVAC display panel connector A (22P).  

8. Check for continuity between body ground and audio-HVAC display panel connector A (22P) terminals 

No. 1, 8, 9, 15 and 20 individually. 

Is there continuity? 

YES: Repair any short to body ground in the wire(s) between the audio-HVAC display panel 
and the driver's air mix control motor.  

NO: Go to step 9.  

Fig. 48: Checking For Continuity Between Body Ground & Audio-HVAC Display Panel 
Connector A (22P) Terminals No. 1, 8, 9, 15 & 20 

9. Turn the ignition switch ON (II), and check the same terminals for voltage. 

Is there any voltage? 

YES: Repair any short to power in the wire(s) between the audio-HVAC display panel and 
the driver's air mix control motor. This short also damages the audio-HVAC display panel. 
Repair the short to power before replacing the audio-HVAC display panel.  

NO: Substitute a known-good audio-HVAC display panel, and recheck. If the 
symptom/indication goes away, replace the original audio-HVAC display panel. 

 

2004 Acura TSX 

2004 AUTOMATIC A/C SYSTEMS Climate Control System - TSX

  

 

Fig. 49: Checking For Voltage Between Body Ground & Audio-HVAC Display Panel 
Connector A (22P) Terminals No. 1, 8, 9, 15 & 20 

DTC INDICATOR K OR DTC B1235: A PROBLEM IN THE DRIVER'S AIR MIX CONTROL 
LINKAGE, DOOR, OR MOTOR 

1. Clear the DTC.  

2. Turn the ignition switch OFF, and then ON.  

3. Operate the climate control system is several modes.  

4. Check the DTCs. 

Is DTC K or B1235 indicated? 

YES: Go to step 5.  

NO: Intermittent failure.  

5. Test the driver's air mix control motor (see DRIVER'S AIR MIX CONTROL MOTOR TEST ). 

Is the driver's air mix control motor OK? 

YES: Substitute a known-good audio-HVAC display panel, and recheck. If the 
symptom/indication goes away, replace the original audio-HVAC display panel.  

NO: Replace the driver's air mix control motor, or repair the driver's air mix control linkage 
or door.  

DTC INDICATOR L OR DTC B1239: A SHORT OR OPEN IN THE MODE CONTROL MOTOR 
CIRCUIT 

 

2004 Acura TSX 

2004 AUTOMATIC A/C SYSTEMS Climate Control System - TSX

  

 

1. Clear the DTC.  

2. Turn the ignition switch OFF, and then ON.  

3. Operate the climate control system is several modes.  

4. Check the DTCs. 

Is DTC L or B1239 indicated? 

YES: Go to step 5.  

NO: Intermittent failure, check for loose wires or poor connections on the mode control 
motor circuit.  

5. Test the mode control motor (see MODE CONTROL MOTOR TEST ). 

Is the mode control motor OK? 

YES: Go to step 6.  

NO: Replace the mode control motor.  

6. Disconnect the mode control motor 7P connector.  

7. Disconnect audio-HVAC display panel connector A (22P).  

8. Check for continuity between body ground and audio-HVAC display panel connector A (22P) terminals 

No. 6, 7, 15, 16, 17, 18 and 19 individually. 

Is there continuity? 

YES: Repair any short to body ground in the wire(s) between the audio-HVAC display panel 
and the mode control motor.  

NO: Go to step 9.  

 

2004 Acura TSX 

2004 AUTOMATIC A/C SYSTEMS Climate Control System - TSX