Acura CSX. Manual — part 485

０５

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０７

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YES

NO

YES

NO

YES

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YES

NO

21-58

Climate Control

RADIATOR FAN 2P CONNECTOR

BRN

RADIATOR FAN 2P CONNECTOR

RED

JUMPER WIRE

FAN CONTROL RELAY 5P SOCKET

RED

23. Measure the voltage between the radiator fan 2P

connector terminal No. 2 and body ground.

Go to step 24.

Repair open in the wire between the radiator

fan relay and the radiator fan.

24. Set the A/C button and fan control dial OFF, then

turn the ignition switch to LOCK (0).

25. Reconnect the radiator fan 2P connector.

26. Connect the radiator fan 2P connector terminal

No. 1 to body ground with a jumper wire.

27. Turn the ignition switch to ON (II), then set the A/C

button and fan control dial ON.

Go to step 28.

Replace the radiator fan motor.

28. Set the A/C button and fan control dial OFF, then

turn the ignition switch to LOCK (0).

29. Disconnect the jumper wire.

30. Remove the fan control relay from the under-hood

fuse/relay box, and test it (see page 22-70).

Go to step 31.

Replace the fan control relay.

31. Turn the ignition switch to ON (II), then set the A/C

button and fan control dial ON.

32. Measure the voltage between the fan control relay

5P socket terminal No. 1 and body ground.

Go to step 33.

Repair open in the wire between the radiator

fan and the fan control relay.

33. Set the A/C button and fan control dial OFF, then

turn the ignition switch to LOCK (0).

Wire side of female terminals

Wire side of female terminals

Is ther e batter y voltage?

Does the r adiator f an r un?

Is the r elay OK ?

Is ther e batter y voltage?

08/08/21 14:42:26 61SNR030_210_0059

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１１

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YES

NO

YES

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YES

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YES

NO

21-59

FAN CONTROL RELAY 5P SOCKET

BLU

BLU

A/C CONDENSER FAN 2P CONNECTOR

BLK

A/C CONDENSER FAN 2P CONNECTOR

A/C DIODE A

1

2

1

2

A/C DIODE A 2P SOCKET

BRN

34. Disconnect the A/C condenser fan 2P connector.

35. Check for continuity between the fan control relay

5P socket terminal No. 4 and the A/C condenser fan
2P connector terminal No. 2.

Go to step 36.

Repair open in the wire between the fan

control relay and the A/C condenser fan.

36. Check for continuity between the A/C condenser

fan 2P connector terminal No. 1 and body ground.

Replace the A/C condenser fan motor.

Check for an open in the wire between the A/C

condenser fan and body ground. If the wire is OK,
check for poor ground at G301 (see page 22-64).

37. Turn the ignition switch to LOCK (0).

38. Remove A/C diode A from the under-hood fuse/

relay box.

39. Using the diode setting (

) on a DVOM, check

for current flow in both directions between the A/C
diode A terminals No. 1 and No. 2.

Go to step 40.

Replace A/C diode A.

40. Turn the ignition switch to ON (II).

41. Measure the voltage between the A/C diode A 2P

socket terminal No. 2 and body ground.

Replace the under-hood fuse/relay box

(see page 22-65).

Repair open in the wire between the No. 36

(10 A) fuse in the under-dash fuse/relay box and
A/C diode A.

Wire side of female terminals

Wire side of female terminals

Is ther e continuity?

Is ther e continuity?

Is ther e cur r ent f low in only one dir ection?

Is ther e batter y voltage?

08/08/21 14:42:27 61SNR030_210_0060

０１

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YES

NO

YES

NO

YES

NO

YES

NO

YES

NO

21-60

Climate Control

A/C Condenser Fan High Speed Circuit Troubleshooting

A/C CONDENSER FAN RELAY 4P SOCKET

JUMPER WIRE

BLU

A/C CONDENSER FAN RELAY 4P SOCKET

A/C CONDENSER FAN RELAY 4P SOCKET

NOTE:

• Do not use this troubleshooting procedure if the A/C

compressor is inoperative. Refer to the symptom
troubleshooting index.

• Before performing symptom troubleshooting, check

for powertrain DTCs (see page 11-3).

1. Check the No. 6 (20 A) and No. 15 (7.5 A) fuses in

the under-hood fuse/relay box.

Go to step 2.

Replace the fuses, and recheck. If the fuses

blow again, check for a short in the No. 6 (20 A) and
No. 15 (7.5 A) fuses circuit.

2. Remove the A/C condenser fan relay from the

under-hood fuse/relay box, and test it (see page
22-70).

Go to step 3.

Replace the A/C condenser fan relay.

3. Measure the voltage between the A/C condenser

fan relay 4P socket terminal No. 1 and body ground.

Go to step 4.

Replace the under-hood fuse/relay box

(see page 22-65).

4. Connect the A/C condenser fan relay 4P socket

terminals No. 1 and No. 2 with a jumper wire.

Go to step 5.

Replace the under-hood fuse/relay box

(see page 22-65).

5. Disconnect the jumper wire.

6. Turn the ignition switch to ON (II).

7. Measure the voltage between the A/C condenser

fan relay 4P socket terminal No. 4 and body ground.

Go to step 8.

Go to step 14.

Ar e the f uses OK ?

Is the r elay OK ?

Is ther e batter y voltage?

Does the A/ C condenser f an r un on high?

Is ther e batter y voltage?

08/08/21 14:43:31 61SNR030_210_0061

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YES

NO

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YES

NO

21-61

ECM/PCM CONNECTOR A (44P)

GRY

JUMPER WIRE

A/C DIODE B 2P SOCKET

A/C DIODE B

1

2

1

2

8. Turn the ignition switch to LOCK (0).

9. Reinstall the A/C condenser fan relay.

10. Jump the SCS line with the HDS.

NOTE: This step must be done to protect the engine
control module (ECM)/powertrain control module
(PCM) from damage.

11. Disconnect ECM/PCM connector A (44P).

12. Connect the ECM/PCM connector A (44P) terminal

No. 5 to body ground with a jumper wire.

13. Turn the ignition switch to ON (II).

Check for loose wires or poor connections at

ECM/PCM connector A (44P) terminal No. 5. If the
connections are good, substitute a known-good
ECM/PCM, and recheck. If the symptom/indication
goes away, replace the original ECM/PCM
(see page 11-228).

Repair open in the wire between the A/C

condenser fan relay and the ECM/PCM.

14. Remove the A/C diode B from the under-hood fuse/

relay box.

15. Turn the ignition switch to ON (II).

16. Measure the voltage between the A/C diode B 2P

socket terminal No. 2 and body ground.

Go to step 17.

Replace the under-hood fuse/relay box

(see page 22-65).

17. Using the diode setting (

) on a DVOM, check

for current flow in both directions between the A/C
diode B terminals No. 1 and No. 2.

Replace the under-hood fuse/relay box

(see page 22-65).

Replace the A/C diode B.

Terminal side of female terminals

Does the A/ C condenser f an r un on high?

Is ther e batter y voltage?

Is ther e cur r ent f low in only one dir ection?

08/08/21 14:43:32 61SNR030_210_0062