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