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