Content .. 399 400 401 402 ..

Honda Ridgeline. Manual - part 401

０１

０２

ＳＪＣ８Ａ００Ｇ１０１１０２４９１１２ＦＡＡＴ１０

−

YES

21-40

Heating/Air Conditioning

Radiator and A/C Condenser Fan Low Speed Circuit Troubleshooting

A/C CONDENSER FAN RELAY 4P SOCKET

YEL/GRN

A/C CONDENSER FAN RELAY 4P SOCKET

YEL/GRN

BLU/YEL

JUMPER WIRE

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. 20 (30 A) fuse in the under-hood

fuse/relay box, and the No. 30 (7.5 A) fuse in the
under-dash fuse/relay box.

Go to step 2.

Replace the fuses, and recheck. If the fuses

blow again, check for a short in the No. 20 (30 A)
and No. 30 (7.5 A) fuses circuit.

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

auxiliary under-hood fuse/relay box, and test it
(see page 22-75).

Go to step 3.

Replace the A/C condenser fan relay.

3. Connect the HDS to the DLC (see page 21-8).

4. Turn the ignition switch ON (II).

5. Turn on the A/C on the HVAC control unit.

6. Check the FAN LOW CTRL in the PGM-FI Data List

with the HDS.

Go to step 7.

Substitute a known-good PCM (see page 11-8),

and retest. If the symptom/indication goes away
with a known-good PCM, replace the original PCM
(see page 11-205).

7. Measure the voltage between the A/C condenser

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

Go to step 8.

Repair open in the wire between the No. 20

(30 A) fuse in the auxiliary under-hood fuse/relay
box and the A/C condenser fan relay.

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

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

Go to step 9.

Go to step 18.

Ar e the f uses OK ?

Is the r elay OK ?

Is the F AN LOW CT RL on?

Is ther e batter y voltage?

Do the A/ C condenser and r adiator f ans r un?

０３

０４

−

YES

21-41

A/C CONDENSER FAN RELAY 4P SOCKET

BLU/YEL

PCM CONNECTOR A (44P)

GRN/YEL

JUMPER WIRE

9. Disconnect the jumper wire.

10. Turn the ignition switch ON (II).

11. Measure the voltage between the A/C condenser

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

Go to step 12.

Go to step 36.

12. Turn the ignition switch OFF.

13. Reinstall the A/C condenser fan relay.

14. Jump the SCS line with the HDS.

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

15. Disconnect PCM connector A (44P).

16. Connect the PCM connector A (44P) No. 4 terminal

to body ground with a jumper wire.

17. Turn the ignition switch ON (II).

Check for loose wires or poor connections at

PCM connector A (44P) No. 4 terminal. If the
connections are good, substitute a known-good
PCM, and recheck. If the symptom/indication goes
away, replace the original PCM (see page 11-205).

Repair open in the wire between the A/C

condenser fan relay and the PCM.

18. Disconnect the jumper wire.

19. Reinstall the A/C condenser fan relay.

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

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

button and fan control dial ON.

(cont’d)

Terminal side of female terminals

Is ther e batter y voltage?

Do the A/ C condenser and r adiator f ans r un on
LO?

０５

０６

０７

−

YES

21-42

Heating/Air Conditioning

Radiator and A/C Condenser Fan Low Speed Circuit Troubleshooting
(cont’d)

A/C CONDENSER FAN 2P CONNECTOR

BLU/YEL

A/C CONDENSER FAN 2P CONNECTOR

WHT/RED

JUMPER WIRE

FAN CONTROL RELAY 5P SOCKET

WHT/RED

22. Measure the voltage between the A/C condenser

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

Go to step 23.

Repair open in the wire between the A/C

condenser fan relay and the A/C condenser fan.

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

turn the ignition switch OFF.

24. Reconnect the A/C condenser fan 2P connector.

25. Connect the A/C condenser fan 2P connector No. 1

terminal to body ground with a jumper wire.

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

button and fan control dial ON.

Go to step 27.

Replace the A/C condenser fan motor.

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

turn the ignition switch OFF.

28. Disconnect the jumper wire.

29. Remove the fan control relay from the auxiliary

under-hood relay box, and test it (see page 22-75).

Go to step 30.

Replace the fan control relay.

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

button and fan control dial ON.

31. Measure the voltage between the fan control relay

5P socket No. 1 terminal and body ground.

Go to step 32.

Repair open in the wire between the A/C

condenser fan and the fan control relay.

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

turn the ignition switch OFF.

Wire side of female terminals

Is ther e batter y voltage?

Does the A/ C condenser f an r un?

Is the r elay OK ?

Is ther e batter y voltage?

０９

１０

１１

１２

−

YES

21-43

RADIATOR FAN 2P CONNECTOR

BLU/BLK

FAN CONTROL RELAY 5P SOCKET

BLU/BLK

BLK

RADIATOR FAN 2P CONNECTOR

A/C DIODE A

A/C DIODE 4P SOCKET

BLK/YEL

33. Disconnect the radiator fan 2P connector.

34. Check for continuity between the fan control relay

5P socket No. 4 terminal and the radiator fan 2P
connector No. 2 terminal.

Go to step 35.

Repair open in the wire between the fan

control relay and the radiator fan.

35. Check for continuity between the radiator fan 2P

connector No. 1 terminal and body ground.

Replace the radiator fan motor.

Check for an open in the wire between the

radiator fan and body ground. If the wire is OK,
check for poor ground at G201 (see page 22-68).

36. Turn the ignition switch OFF.

37. Remove A/C diode A from right engine

compartment wire harness.

38. Using the diode setting (

) on a DVOM, check

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

Go to step 39.

Replace A/C diode A.

39. Turn the ignition switch ON (II).

40. Measure the voltage between the A/C diode 4P

socket No. 2 terminal and body ground.

Repair open in the wire between A/C diode A

and the A/C condenser fan relay.

Repair open in the wire between the No. 30

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

Wire side of female terminals

Is ther e continuity?

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

Is ther e batter y voltage?

Content .. 399 400 401 402 ..