Content .. 420 421 422 423 ..

Honda Ridgeline. Manual - part 422

０５

０６

０７

−

YES

21-124

Climate Control

DTC Troubleshooting (cont’d)

BLU/RED

POWER TRANSISTOR 4P CONNECTOR

BLU/YEL

BLU/
YEL

BLU/RED

CLIMATE CONTROL UNIT 30P CONNECTOR

BLU/RED

BLU/
YEL

CLIMATE CONTROL UNIT 30P CONNECTOR

BLOWER MOTOR 2P CONNECTOR

WHT/BLU

18. Check for continuity between the following

terminals of the climate control unit 30P connector
and the power transistor 4P connector.
30P:

4P:

No. 11

No. 1

No. 12

No. 2

Go to step 19.

Repair open in the wires between the climate

control unit and the power transistor.

19. Start the engine.

20. Measure the voltage between body ground and the

climate control unit 30P connector No. 11 and
No. 12 terminals individually.

Repair short to power in the wires.

Go to step 21.

21. Reconnect the climate control unit 30P connector.

22. Test the power transistor (see page 21-54).

Check for loose wires or poor connections at

the climate control unit 30P connector and at the
power transistor 4P connector. If the connections
are good, substitute a known-good climate control
unit, and recheck. If the symptom/indication goes
away, replace the original climate control unit.

Replace the power transistor.

23. Disconnect the jumper wire.

24. Disconnect the blower motor 2P connector.

25. Measure the voltage between the blower motor 2P

connector No. 1 terminal and body ground.

Replace the blower motor.

Go to step 26.

26. Turn the ignition switch OFF.

27. Remove the blower motor relay from the under-

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

Go to step 28.

Replace the blower motor relay.

Wire side of female terminals

Is ther e continuity?

Is ther e voltage?

Is the power tr ansistor OK ?

Is ther e batter y voltage?

Is the r elay OK ?

０８

０９

１０

−

YES

21-125

BLOWER MOTOR RELAY 4P SOCKET

BLK/YEL

BLOWER MOTOR RELAY 4P SOCKET

BLK

28. Measure the voltage between the blower motor

relay 4P socket No. 2 terminal and body ground.

Go to step 29.

Replace the under-hood fuse/relay box

(see page 22-72).

29. Turn the ignition switch ON (II).

30. Measure the voltage between the blower motor

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

Go to step 31.

Repair open in the wire between the No. 30

(7.5 A) fuse in the under-dash fuse/relay box and
the blower motor relay.

31. Turn the ignition switch OFF.

32. Check for continuity between the blower motor

relay 4P socket No. 3 terminal and body ground.

Repair open in the WHT/BLU wire between

the blower motor relay and the blower motor.

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 G202 (see page 22-68).

Is ther e batter y voltage?

Is ther e continuity?

０１

ＳＪＣ８ＡＨ７Ｇ２４１０００５０６０２ＦＡＡＴ８０

−

YES

21-126

Climate Control

Recirculation Control Motor Circuit Troubleshooting

RECIRCULATION CONTROL MOTOR 7P CONNECTOR

BLK/YEL

CLIMATE CONTROL UNIT 30P CONNECTOR

GRN/RED

GRN/WHT

1. Check the No. 30 (7.5 A) fuse in the under-dash

fuse/relay box.

Go to step 2.

Replace the fuse, and recheck. If the fuse

blows again, check for a short in the No. 30 (7.5 A)
fuse circuit.

2. Disconnect the recirculation control motor 7P

connector.

3. Turn the ignition switch ON (II).

4. Measure the voltage between the recirculation

control motor 7P connector No. 1 terminal and
body ground.

Go to step 5.

Repair open in the wire between the No. 30

(7.5 A) fuse in the under-dash fuse/relay box and
the recirculation control motor.

5. Turn the ignition switch OFF.

6. Test the recirculation control motor (see page

21-57).

Go to step 7.

Replace the recirculation control motor

(see page 21-57), or repair the recirculation control
linkage or door.

7. Disconnect the climate control unit 30P connector.

8. Check for continuity between body ground and the

climate control unit 30P connector No. 27 and
No. 28 terminals individually.

Repair short to body ground in the wires

between the climate control unit and the
recirculation control motor.

Go to step 9.

Wire side of female terminals

Is the f use OK ?

Is ther e batter y voltage?

Is the r ecir culation contr ol motor OK ?

Is ther e continuity?

０３

０４

−

YES

21-127

GRN/WHT

CLIMATE CONTROL UNIT 30P CONNECTOR

GRN/RED

RECIRCULATION CONTROL MOTOR 7P CONNECTOR

CLIMATE CONTROL UNIT 30P CONNECTOR

GRN/RED

GRN/WHT

GRN/RED

9. Turn the ignition switch ON (II), and check the same

terminals for voltage to body ground.

Repair short to power in the wires between

the climate control unit and the recirculation
control motor. This short may also damage the
climate control unit. Repair the short to power
before replacing the climate control unit.

Go to step 10.

10. Turn the ignition switch OFF.

11. Check for continuity between the following

terminals of the climate control unit 30P connector
and the recirculation control motor 7P connector.
30P:

7P:

No. 27

No. 5

No. 28

No. 7

Check for loose wires or poor connections at

the climate control unit 30P connector and at the
recirculation control motor 7P connector. If the
connections are good, substitute a known-good
climate control unit, and recheck. If the symptom/
indication goes away, replace the original climate
control unit.

Repair open in the wires between the climate

control unit and the recirculation control motor.

Wire side of female terminals

Is ther e any voltage?

Is ther e continuity?

Content .. 420 421 422 423 ..