Acura TSX / Honda Accord CL. Manual - part 654

8. Check for continuity between the No. 13 terminal of audio-HVAC display panel connector A (22P) and 

the No. 1 terminal of the sunlight sensor 2P connector. 

Is there continuity? 

YES: Go to step 9.  

NO: Repair open in the wire between the audio-HVAC display panel and the sunlight sensor. 

Fig. 41: Checking For Continuity Between The No. 13 Terminal Of Audio-HVAC Display 
Panel Connector A (22P) & The No. 1 Terminal Of The Sunlight Sensor 2P Connector 

9. Check for continuity between the No. 15 terminal of audio-HVAC display panel connector A (22P) and 

the No. 2 terminal of the sunlight sensor 2P connector. 

Is there continuity? 

YES: Check for loose wires or poor connections at audio-HVAC display panel connector A 
(22P) and at the sunlight sensor 2P connector. If the connections are good, substitute a 
known-good audio-HVAC display panel, and recheck. If the symptom/indication goes away, 
replace the original audio-HVAC display panel.  

NO: Repair open in the wire between the audio-HVAC display panel and the sunlight sensor. 

 

2004 Acura TSX 

2004 AUTOMATIC A/C SYSTEMS Climate Control System - TSX

  

 

Fig. 42: Checking For Continuity Between The No. 15 Terminal Of Audio-HVAC Display 
Panel Connector A (22P) & The No. 2 Terminal Of The Sunlight Sensor 2P Connector 

DTC INDICATOR F OR DTC B1230: A SHORT IN THE SUNLIGHT SENSOR 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 F or B1230 indicated? 

YES: Go to step 5.  

NO: Intermittent failure.  

5. Test the sunlight sensor (see SUNLIGHT SENSOR TEST ). 

Is the sunlight sensor OK? 

YES: Go to step 6.  

NO: Replace the sunlight sensor.  

6. Disconnect the sunlight sensor 2P connector. 

 

2004 Acura TSX 

2004 AUTOMATIC A/C SYSTEMS Climate Control System - TSX

  

 

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

8. Check for continuity between the No. 13 terminal of audio-HVAC display panel connector A (22P) and 

body ground. 

Is there continuity? 

YES: Repair short to body ground in the wire between the audio-HVAC display panel and 
the sunlight sensor.  

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

Fig. 43: Checking For Continuity Between The No. 13 Terminal Of Audio-HVAC Display 
Panel Connector A (22P) & Body Ground 

DTC INDICATOR G OR DTC B1231: AN OPEN IN THE EVAPORATOR TEMPERATURE SENSOR 
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. 

 

2004 Acura TSX 

2004 AUTOMATIC A/C SYSTEMS Climate Control System - TSX

  

 

Is DTC G or B1231 indicated? 

YES: Go to step 5.  

NO: Intermittent failure, check for loose wires or poor connections on the evaporator 
temperature sensor circuit.  

5. Remove the evaporator temperature sensor (see EVAPORATOR TEMPERATURE SENSOR TEST ) 

and test it (see EVAPORATOR TEMPERATURE SENSOR REPLACEMENT ). 

Does the evaporator temperature sensor test OK? 

YES: Go to step 6.  

NO: Replace the evaporator temperature sensor.  

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

7. Check for continuity between the No. 14 terminal of audio-HVAC display panel connector A (22P) and 

the No. 1 terminal of the evaporator temperature sensor 2P connector. 

Is there continuity? 

YES: Go to step 8.  

NO: Repair open in the wire between the audio-HVAC display panel and the evaporator 
temperature sensor.  

Fig. 44: Checking For Continuity Between The No. 14 Terminal Of Audio-HVAC Display 
Panel Connector A (22P) & The No. 1 Terminal Of The Evaporator Temperature Sensor 2P 

 

2004 Acura TSX 

2004 AUTOMATIC A/C SYSTEMS Climate Control System - TSX