Acura TSX / Honda Accord CL. Manual - part 652

3. Operate the climate control system is several modes.  

4. Check the DTCs. 

Is DTC A or B1225 indicated? 

YES: Go to step 5.  

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

5. Remove the in-car temperature sensor and test it (see IN-CAR TEMPERATURE SENSOR TEST ). 

Does the in-car temperature sensor test OK? 

YES: Go to step 6.  

NO: Replace the in-car temperature sensor.  

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

7. Check for continuity between the No. 11 terminal of audio-HVAC display panel connector A (22P) and 

the No. 2 terminal of the in-car 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 in-car 
temperature sensor.  

 

2004 Acura TSX 

2004 AUTOMATIC A/C SYSTEMS Climate Control System - TSX

  

 

Fig. 35: Checking For Continuity Between The No. 11 Terminal Of Audio-HVAC Display 
Panel Connector A (22P) & The No. 2 Terminal Of The In-Car Temperature Sensor 2P 
Connector 

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

the No. 1 terminal of the in-car temperature 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 in-car temperature 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 climate control unit and the in-car temperature 
sensor.  

 

2004 Acura TSX 

2004 AUTOMATIC A/C SYSTEMS Climate Control System - TSX

  

 

Fig. 36: Checking For Continuity Between The No. 15 Terminal Of Audio-HVAC Display 
Panel Connector A (22P) & The No. 1 Terminal Of The In-Car Temperature Sensor 2P 
Connector 

DTC INDICATOR B OR DTC B1226: A SHORT IN THE IN-CAR 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. 

Is DTC B or B1226 indicated? 

YES: Go to step 5.  

NO: Intermittent failure.  

5. Remove the in-car temperature sensor (see IN-CAR TEMPERATURE SENSOR REPLACEMENT ). 

6. Test the in-car temperature sensor (see IN-CAR TEMPERATURE SENSOR TEST ). 

Is the resistance within the specifications shown on the graph? 

YES: Go to step 7.  

 

2004 Acura TSX 

2004 AUTOMATIC A/C SYSTEMS Climate Control System - TSX

  

 

NO: Replace the in-car temperature sensor.  

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

8. Check for continuity between the No. 11 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 in-car temperature 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. 37: Checking For Continuity Between The No. 11 Terminal Of Audio-HVAC Display 
Panel Connector A (22P) & Body Ground 

DTC INDICATOR C OR DTC B1227: AN OPEN IN THE OUTSIDE AIR 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. 

 

2004 Acura TSX 

2004 AUTOMATIC A/C SYSTEMS Climate Control System - TSX