Acura TSX / Honda Accord CL. Manual - part 668

Fig. 87: Checking For Continuity Between The No. 1 & No. 2 Terminals Of The A/C Pressure 
Switch 

14. Reconnect the A/C pressure switch 2P connector. 

 

2004 Acura TSX 

2004 AUTOMATIC A/C SYSTEMS Climate Control System - TSX

  

 

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

16. Turn the ignition switch ON (II).  

17. Measure the voltage between the No. 5 terminal of audio-HVAC display panel connector A (22P) and 

body ground. 

Is there about 5 V or more? 

YES: Go to step 18.  

NO: Repair open in the wire between the audio-HVAC display panel and the A/C pressure 
switch.  

Fig. 88: Measuring The Voltage Between The No. 5 Terminal Of Audio-HVAC Display Panel 
Connector A (22P) & Body Ground 

18. Turn the ignition switch off.  

19. Measure the resistance between the No. 14 and No. 15 terminals of the audio-HVAC display panel 

connector A (22P). 

Is the resistance less than 24k ohms? 

YES: Check for loose wire or poor connections at audio-HVAC display panel connector A 
(22P) and at the A/C pressure switch 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 cause of high resistance in the evaporator temperature circuit.  

 

2004 Acura TSX 

2004 AUTOMATIC A/C SYSTEMS Climate Control System - TSX

  

 

Fig. 89: Measuring The Resistance Between The No. 14 & No. 15 Terminals Of The Audio-
HVAC Display Panel Connector A (22P) 

20. Using a backprobe set, measure the voltage between the No. 2 terminal of under-hood fuse/relay box 

connector H (14P) and body ground with the under-hood fuse/relay box connectors connected. 

Is there 5 V or more? 

YES: Repair open in the wire between the under-hood fuse/relay box and the A/C pressure 
switch.  

NO: Check for loose or poor connections at the No. 2 terminal of the under-hood fuse/relay 
box, if the connections are OK, replace the under-hood fuse/relay box.  

 

2004 Acura TSX 

2004 AUTOMATIC A/C SYSTEMS Climate Control System - TSX

  

 

Fig. 90: Measuring The Voltage Between The No. 2 Terminal Of Under-Hood Fuse/Relay Box 
Connector H (14P) & Body Ground (Under-Hood Fuse/Relay Box Connectors Connected) 

21. Check for proper A/C system pressure. 

Is the pressure within specifications? 

YES: Replace the A/C pressure switch.  

NO: Repair the A/C pressure problem.  

IN-CAR TEMPERATURE SENSOR TEST 

Check for a change in resistance by heating or cooling the sensor with a hair drier. Compare the resistance 
reading between the No. 1 and No. 2 terminals of the in-car temperature sensor with the specifications shown in 
the graph; the resistance should be within the specifications.

 

2004 Acura TSX 

2004 AUTOMATIC A/C SYSTEMS Climate Control System - TSX