Acura TSX / Honda Accord CL. Manual - part 653

4. Check the DTCs. 

Is DTC C or B1227 indicated? 

YES: Go to step 5.  

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

5. Remove the outside air temperature sensor (see OUTSIDE AIR TEMPERATURE SENSOR TEST ) 

and test it (see OUTSIDE AIR TEMPERATURE SENSOR REPLACEMENT ). 

Does the outside air temperature sensor test OK? 

YES: Go to step 6.  

NO: Replace the outside air temperature sensor.  

6. Disconnect climate control unit connector A (22P).  

7. Check for continuity between the No. 12 terminal of audio-HVAC display panel connector A (22P) and 

the No. 1 terminal of the outside air 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 outside air 
temperature sensor.  

Fig. 38: Checking For Continuity Between The No. 12 Terminal Of Audio-HVAC Display 

 

2004 Acura TSX 

2004 AUTOMATIC A/C SYSTEMS Climate Control System - TSX

  

 

Panel Connector A (22P) & The No. 1 Terminal Of The Outside Air Temperature Sensor 2P 
Connector 

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

the No. 2 terminal of the outside air 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 outside air 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 audio-HVAC display panel and the outside air 
temperature sensor.  

Fig. 39: Checking For Continuity Between The No. 15 Terminal Of Audio-HVAC Display 
Panel Connector A (22P) & The No. 2 Terminal Of The Outside Air Temperature Sensor 2P 
Connector 

DTC INDICATOR D OR DTC 1228: A SHORT IN THE OUTSIDE AIR TEMPERATURE SENSOR 
CIRCUIT 

1. Clear the DTC.  

 

2004 Acura TSX 

2004 AUTOMATIC A/C SYSTEMS Climate Control System - TSX

  

 

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

3. Operate the climate control system is several modes.  

4. Check the DTCs. 

Is DTC D or B1228 indicated? 

YES: Go to step 5.  

NO: Intermittent failure.  

5. Remove the outside air temperature sensor (see OUTSIDE AIR TEMPERATURE SENSOR 

REPLACEMENT ).  

6. Test the outside air temperature sensor (see OUTSIDE AIR TEMPERATURE SENSOR TEST ). 

Is the resistance within the specifications shown on the graph? 

YES: Go to step 7.  

NO: Replace the outside air temperature sensor.  

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

8. Check for continuity between the No. 12 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 outside air temperature sensor.  

NO: Substitute a known-good audio-HVAC display module, 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. 40: Checking For Continuity Between The No. 12 Terminal Of Audio-HVAC Display 
Panel Connector A (22P) & Body Ground 

DTC INDICATOR E OR DTC B1229: AN OPEN 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 E or B1229 indicated? 

YES: Go to step 5.  

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

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.  

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

 

2004 Acura TSX 

2004 AUTOMATIC A/C SYSTEMS Climate Control System - TSX