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