Mitsubishi Montero (2002-2004). Manual - part 95

AUTO A/C DIAGNOSIS

TSB Revision

AUTOMATIC AIR CONDITIONING

55B-73

STEP 21. Check blower motor connector D-113 and heater 
blower controller unit connector D-17 for damage.
Q: Is blower motor connector D-113 and heater blower 

controller unit D-17 in good condition?
YES : Go to Step 22.
NO :  Repair or replace the connector. Refer to GROUP 

00E, Harness Connector Inspection 

P.00E-2

. The 

blower motor should operate normally.

STEP 22. Check the wiring harness between blower motor 
connector D-113 (terminal 2) and heater blower controller 
unit connector D-17 (terminal 1).
Q: Is the wiring harness between blower motor connector 

D-113 (terminal 2) and heater blower controller unit 
connector D-17 (terminal 1) in good condition?
YES : Go to Step 23.
NO :  Repair the wiring harness. The blower motor should 

operate normally.

AC204189

CONNECTORS : D-17, D-113

D-17

HARNESS SIDE

HARNESS SIDE

D-113

AC

D-113

D-17

1

2

3

4

1

2

AC204189

CONNECTORS : D-17, D-113

D-17

HARNESS SIDE

HARNESS SIDE

D-113

AC

D-113

D-17

1

2

3

4

1

2

AUTO A/C DIAGNOSIS

TSB Revision

AUTOMATIC AIR CONDITIONING

55B-74

STEP 23. Check A/C-ECU connector D-23 and heater 
blower controller unit connector D-17 for damage.
Q: Is A/C-ECU connector D-23 and heater blower controller 

unit D-17 in good condition?
YES : Go to Step 24.
NO :  Repair or replace the connector. Refer to GROUP 

00E, Harness Connector Inspection 

P.00E-2

. The 

blower motor should operate normally.

STEP 24. Check the wiring harness between A/C-ECU 
connector D-23 (terminal 10) and heater blower controller 
unit connector D-17 (terminal 3).
Q: Is the wiring harness between A/C-ECU connector D-23 

(terminal 10) and heater blower controller unit 
connector D-17 (terminal 3) in good condition?
YES : Go to Step 25.
NO :  Repair the wiring harness. The blower motor should 

operate normally.

AC204171

CONNECTOR : D-17

AP

1

2

3

4

HARNESS 
SIDE

AC204170

CONNECTOR : D-23

D-23(B)

D-23(B)

CP

HARNESS 
SIDE

1

3

4

2

12

1413

11

6

7

8

10 9

18

19

20

16

17

5

15

AC204171

CONNECTOR : D-17

AP

1

2

3

4

HARNESS 
SIDE

AC204170

CONNECTOR : D-23

D-23(B)

D-23(B)

CP

HARNESS 
SIDE

1

3

4

2

12

1413

11

6

7

8

10 9

18

19

20

16

17

5

15

AUTO A/C DIAGNOSIS

TSB Revision

AUTOMATIC AIR CONDITIONING

55B-75

STEP 25. Replace the heater blower controller unit.
Q: Do the blower motor work normally?

YES : The procedure is complete.
NO :  Go to Step 26.

STEP 26. Check the flexible flat cable (FFC).
(1) The FCC is connected to the automatic air conditioning 

control panel assembly. Check that the FCC connection is 
contaminated with foreign material or loose (Refer to 

P.55B-136

).

(2) There should be continuity across the FFC terminals.
Q: Is the FFC normal?

YES : Go to Step 27.
NO :  Repair the FFC. (Refer to 

P.55B-136

.) The blower 

motor should operate normally.

STEP 27. Check the blower switch.
Follow the table below to check the blower switch for continuity.

Q: Is the check result normal?

YES : Replace the A/C-ECU. The blower motor should 

operate normally.

NO :  Replace the automatic air-conditioning control panel. 

The blower motor should operate normally.

AC205264AB

SWITCH 
POSITION

TESTER 
CONNECTION 

SPECIFIED 
CONDITION

OFF

9 

− 10

Less than 2 ohms

AUTO

8 

− 9, 9 − 10

Less than 2 ohms

1

8 

− 9

Less than 2 ohms

2

6 

− 9, 8 − 9

Less than 2 ohms

3

6 

− 9, 8 − 9, 9 − 10

Less than 2 ohms

4

6 

− 9, 9 − 10

Less than 2 ohms

5

6 

− 9

Open circuit

6

4 

− 9, 6 − 9

Less than 2 ohms

7

4 

− 9, 6 − 9, 9 − 10

Less than 2 ohms

8

4 

− 9, 6 − 9, 8 − 9, 9 − 

10

Less than 2 ohms

AC205403

18

17

16

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

18

17

16

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

AC

AC205260

OFF

AUTO

8

7

6

5

4

3

2

1

AB

AUTO A/C DIAGNOSIS

TSB Revision

AUTOMATIC AIR CONDITIONING

55B-76

INSPECTION PROCEDURE 5: Blower Air Amount cannot be Changed.

.

TECHNICAL DESCRIPTION (COMMENT)
If the blower air amount can not be changed when 
the blower switch is operated, the heater blower con-
troller unit may be defective.

.

TROUBLESHOOTING HINTS

• Malfunction of the heater blower controller unit

• Malfunction of the flexible flat cable

• Malfunction of the blower motor

• Malfunction of the automatic air-conditioning con-

trol panel

• Damaged harness wires or connectors

Blower Motor Circuit

AC204171 AZ

CONNECTOR : D-17

AC204170

CONNECTOR : D-23

DQ

D-23(B)