Acura TSX / Honda Accord CL. Manual — part 659

Fig. 57: Checking For Continuity Between The Terminals Of Audio-HVAC Display Panel
Connector B (16P) & Power Transistor 4P Connector

19. Reconnect audio-HVAC display panel connector B (16P).

20. Test the power transistor (see POWER TRANSISTOR TEST ).

Is the power transistor OK?

YES: Check for loose wire or poor connections at audio-HVAC display panel connector B
(16P) and at the power transistor 4P 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: Replace the power transistor.

21. Disconnect the jumper wire.

22. Disconnect the blower motor 2P connector.

23. Measure the voltage between the No. 1 terminal of the blower motor 2P connector and body ground.

Is there battery voltage?

YES: Replace the blower motor.

NO: Go to step 25 .

2004 Acura TSX

2004 AUTOMATIC A/C SYSTEMS Climate Control System - TSX

Fig. 58: Measuring The Voltage Between The No. 1 Terminal Of The Blower Motor 2P
Connector & Body Ground

24. Turn the ignition switch OFF.

25. Remove the blower motor relay from the underhood fuse/relay box, and test it (see POWER RELAY

TEST ).

Is the relay OK?

YES: Go to step 27 .

NO: Replace the blower motor relay.

26. Measure the voltage between the No. 2 terminal of the blower motor relay 4P socket and body ground.

2004 Acura TSX

2004 AUTOMATIC A/C SYSTEMS Climate Control System - TSX

Is there battery voltage?

YES: Go to step 28 .

NO: Replace the under-hood fuse/relay box.

Fig. 59: Measuring The Voltage Between The No. 2 Terminal Of The Blower Motor Relay 4P
Socket & Body Ground

27. Turn the ignition switch ON (II).

28. Measure the voltage between the No. 4 terminal of the blower motor relay 4P socket and body ground.

Is there battery voltage?

YES: Go to step 30 .

NO: Repair open in the wire between the No. 30 fuse in the driver's under-dash fuse/relay
box and the blower motor relay.

2004 Acura TSX

2004 AUTOMATIC A/C SYSTEMS Climate Control System - TSX

Fig. 60: Measuring The Voltage Between The No. 4 Terminal Of The Blower Motor Relay 4P
Socket & Body Ground

29. Turn the ignition switch OFF.

30. Check for continuity between the No. 3 terminal of the blower motor relay 4P socket and body ground.

Is there continuity?

YES: Repair open in the WHT/BLU wire between the blower motor relay and the blower
motor.

NO: Check for an open in the wire between the blower motor relay and body ground. If the
wire is OK, check for poor ground at G302.

2004 Acura TSX

2004 AUTOMATIC A/C SYSTEMS Climate Control System - TSX