Content .. 397 398 399 400 ..

Honda Ridgeline. Manual - part 399

＊０１

ＳＪＣ８ＡＨ６Ｋ７３３０００Ｙ１２４０ＦＡＡＴ００

−

DTC B1240 or DTC indicator 5:

YES

21-32

Heating/Air Conditioning

DTC Troubleshooting (cont’d)

HVAC CONTROL UNIT 30P CONNECTOR

YEL/RED

MODE CONTROL MOTOR 7P CONNECTOR

YEL/BLU

YEL/RED

YEL/BLU

A Problem in

the Mode Control Linkage, Doors, or Motor

1. Clear the DTC with the HDS.

2. Operate the heater-A/C control system in several

modes.

3. Check for DTCs using the HDS or self-diagnostic.

Go to step 4.

Intermittent failure, check for loose wires or

poor connections on the mode control motor
circuit.

4. Turn the ignition switch OFF.

5. Test the mode control motor (see page 21-56).

Go to step 6.

Replace the mode control motor (see page

21-56), or repair the mode control linkage or
doors.

6. Disconnect the mode control motor 7P connector.

7. Disconnect HVAC control unit 30P connector.

8. Check for continuity between the following

terminals of HVAC control unit 30P connector and
the mode control motor 7P connector.
30P:

7P:

No. 16

No. 2

No. 17

No. 1

Go to step 9.

Repair open in the wire(s) between the HVAC

control unit and the mode control motor.

Wire side of female terminals

Is DT C B1240 or 5 indicated?

Is the mode contr ol motor OK ?

Is ther e continuity?

＊０２

＊０１

ＳＪＣ８ＡＨ６Ｋ７３３０００Ｙ１２４１ＦＡＡＴ００

−

YES

DTC B1241 or DTC indicator 6:

21-33

YEL/RED

YEL/BLU

HVAC CONTROL UNIT 30P CONNECTOR

BLOWER MOTOR 2P CONNECTOR

BLU/BLK

JUMPER WIRE

9. Check for continuity between body ground and

HVAC control unit 30P connector No. 16 and No. 17
terminals individually.

Repair short to body ground in the wire(s)

between the HVAC control unit and the mode
control motor.

Substitute a known-good HVAC control unit,

and recheck. If the symptom/indication goes away,
replace the original HVAC control unit.

1. Clear the DTC with the HDS.

2. Operate the heater-A/C control system in several

modes.

3. Check for DTCs using the HDS or self-diagnostic.

Go to step 4.

Intermittent failure, check for loose wires or

poor connections on the blower motor circuit.

4. Turn the ignition switch OFF.

5. Check the No. 21 (40 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 6.

Replace the fuses, and recheck. If the fuses

blow again, check for a short in the No. 21 (40 A)
and No. 30 (7.5 A) fuses circuit.

6. Connect the blower motor 2P connector No. 2

terminal to body ground with a jumper wire.

7. Turn the ignition switch ON (II).

Go to step 8.

Go to step 23.

(cont’d)

A Problem in

the Blower Motor Circuit

Wire side of female terminals

Is ther e continuity?

Is DT C B1241 or 6 indicated?

Ar e the f uses OK ?

Does the blower motor r un?

０２

０３

０４

−

YES

21-34

Heating/Air Conditioning

DTC Troubleshooting (cont’d)

POWER TRANSISTOR 4P CONNECTOR

BLK

POWER TRANSISTOR 4P CONNECTOR

BLK

BLU/BLK

JUMPER WIRE

HVAC CONTROL UNIT 30P CONNECTOR

BLU/RED

BLU/YEL

8. Turn the ignition switch OFF.

9. Disconnect the jumper wire.

10. Disconnect the power transistor 4P connector.

11. Check for continuity between the power transistor

4P connector No. 4 terminal and body ground.

Go to step 12.

Check for an open in the wire between the

power transistor and body ground. If the wire is OK,
check for poor ground at G402 (see page 22-68).

12. Connect the power transistor 4P connector No. 3

and No. 4 terminals with a jumper wire.

13. Turn the ignition switch ON (II).

Go to step 14.

Repair open in the BLU/BLK wire between the

power transistor and the blower motor.

14. Turn the ignition switch OFF.

15. Disconnect the jumper wire.

16. Disconnect the HVAC control unit 30P connector.

17. Check for continuity between body ground and the

HVAC control unit 30P connector No. 25 and No. 26
terminals individually.

Repair short to body ground in the wires

between the HVAC control unit and the power
transistor.

Go to step 18.

Wire side of female terminals

Is ther e continuity?

Does the blower motor r un at high speed?

Is ther e continuity?

０５

０６

０７

−

YES

21-35

BLU/RED

HVAC CONTROL UNIT 30P CONNECTOR

POWER TRANSISTOR 4P CONNECTOR

BLU/YEL

BLU/RED

HVAC CONTROL UNIT 30P CONNECTOR

BLU/RED

BLU/YEL

WHT/BLU

BLOWER MOTOR 2P CONNECTOR

18. Check for continuity between the following

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

4P:

No. 25

No. 1

No. 26

No. 2

Go to step 19.

Repair open in the wires between the HVAC

control unit and the power transistor.

19. Start the engine.

20. Measure the voltage between body ground and the

HVAC control unit 30P connector No. 25 and No. 26
terminals individually.

Repair short to power in the wires.

Go to step 21.

21. Reconnect the HVAC control unit 30P connector.

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

Check for loose wire or poor connections at

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

(cont’d)

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 ?

Content .. 397 398 399 400 ..