Mitsubishi Montero (2002-2004). Manual - part 99

AUTO A/C DIAGNOSIS

TSB Revision

AUTOMATIC AIR CONDITIONING

55B-89

STEP 5. Check the wiring harness between outside/inside 
air selection damper control motor connector D-10 
(terminal 1) and the ignition switch (IG2).

NOTE: Also check joint connector (6) D-01, junction block con-
nectors D-210 and C-208. If joint connector (6) D-01, junction 
block connector D-210 or C-208 is damaged, repair or replace 
the connector as described in GROUP 00E, Harness Connec-
tor Inspection 

P.00E-2

.

Q: Is the wiring harness between outside/inside air 

selection damper control motor connector D-10 
(terminal 1) and the ignition switch (IG2) in good 
condition?
YES : Check that the outside/inside air selection damper 

control motor works normally.

NO :  Repair the wiring harness. Check that the outside/

inside air changeover damper control motor works 
normally.

AC204171

CONNECTOR : D-10

AO

HARNESS SIDE

1

3 2

AC204170

CONNECTOR: D-01

AB

9 10

8

6 7

31 32

30

29

18 19 20 21

5

4

2

1

3

27

26

24

23

25

12 13 14 15 16 17

28

11
22
33

AC204191

CONNECTORS : D-208, D-210

D-208

D-208

AZ

D-210

D-210

HARNESS SIDE

HARNESS SIDE

1

2

3

5

6

4

1

2

7 6

3

9

4

11

12

10

13

5

8

AUTO A/C DIAGNOSIS

TSB Revision

AUTOMATIC AIR CONDITIONING

55B-90

STEP 6. Check outside/inside air selection damper control 
motor connector D-10 and A/C-ECU connector D-23 for 
damage.
Q: Is outside/inside air selection damper control motor 

connector D-10 and A/C-ECU connector D-23 in good 
condition?
YES : Go to Step 7.
NO :  Repair or replace the connector. Refer to GROUP 

00E, Harness Connector Inspection 

P.00E-2

. Check 

that the outside/inside air changeover damper control 
motor works normally.

STEP 7. Check the wiring harness between outside/inside 
air selection damper control motor connector D-10 
(terminals 2 and 3) and A/C-ECU D-23 (terminals 4 and 3).
Q: Is the wiring harness between outside/inside air 

selection damper control motor connector D-10 
(terminals 2 and 3) and A/C-ECU D-23 (terminals 4 and 
3) in good condition?
YES :  Got to Step 8.
NO :  Repair the wiring harness. Check that the outside/

inside air selection damper control motor works 
normally.

AC204171

CONNECTOR : D-10

AO

HARNESS SIDE

1

3 2

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-10

AO

HARNESS SIDE

1

3 2

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-91

STEP 8. 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 9.
NO :  Repair the FFC. (Refer to 

P.55B-136

.) Check that the 

outside/inside air selection damper control motor 
works normally.

STEP 9. Check the inside/outside air changeover switch.
There should be continuity between terminals 8 and 13 while 
the inside/outside air changeover switch is pushed.
Q: Is the check result normal?

YES : Replace the A/C-ECU. Check that the outside/inside 

air selection damper control motor works normally.

NO :  Replace the automatic air-conditioning control panel. 

Check that the outside/inside air selection damper 
control motor works normally.

AC205264AB

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

AG

AUTO A/C DIAGNOSIS

TSB Revision

AUTOMATIC AIR CONDITIONING

55B-92

INSPECTION PROCEDURE 8: Rear Defogger does not Operate.

Defogger Circuit

AC204170

CONNECTORS : D-23, D-28

DW

D-28

D-23(B)

AC204171

CONNECTOR : D-111

AG