Mitsubishi Montero (2002-2004). Manual - part 49

REAR AIR CONDITIONING DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-59

STEP 6. Check the wiring harness between rear A/C 
control unit connector E-20 (terminal 3, 4 and 8) and rear 
A/C switch connector E-22 (terminal 5, 3 and 13).

NOTE: Also check intermediate connector D-112. If intermedi-
ate connector D-112 is damaged, repair or replace the connec-
tor as described in GROUP 00E, Harness Connector 
Inspection 

P.00E-2

.

Q: Is the wiring harness between rear A/C control unit 

connector E-20 (terminal 3, 4 and 8) and rear A/C switch 
connector E-22 (terminal 5, 3 and 13) in good condition?
YES : Go to Step 7.
NO :  Repair the wiring harness. Check that the rear air 

conditioning works normally.

AC204176

CONNECTOR : E-20

AY

HARNESS SIDE

7

8

3

10 9

2

4

11

1312

5

14

6

1

AC204175

CONNECTOR : E-22

AG

HARNESS SIDE

FLOOR 
COSOLE

1
7

2
8

10

11

5

13

6

14

12

4

9

3

AC204171 AL

CONNECTOR : D-112

2 3

27

32

28

33

16

15

4 5

19

18

29

17

34

7 8

35

22

21

9 10

30

36

31

37

25

24

23

6

20

1

14

26

11

13

12

38

REAR AIR CONDITIONING DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-60

STEP 7. Check the air mixing damper control motor and 
potentiometer

CAUTION

Do not apply battery voltage when the damper is in the 
MAX HOT/MAX COOL position.
Check the air mixing damper control motor by the following pro-
cedures.

When checking the air mixing damper control motor, measure 
the resistance value between the terminals 3 and 5, between 
the terminals 3 and 7. At this time, make sure that the mea-
sured resistance value changes slowly within the standard 
value.

Standard value: 1.2 

− 4.8 kΩ

Q: Does air mixing damper control motor work normally?

YES : Go to Step 8.
NO :  Replace the air mixing damper control motor. Check 

that the rear air conditioning works normally. 

LEVER POSITION BATTERY 

CONNECTION

LEVER 
OPERATION

At the MAX COOL 
position

• Connect 

terminal 1 to the 
positive battery 
terminal

• Connect 

terminal 2 to the 
negative battery 
terminal

The lever moves 
from the MAX 
COOL position to 
the MAX HOT 
position

At the MAX HOT 
position

• Connect 

terminal 2 to the 
positive battery 
terminal

• Connect 

terminal 1 to the 
negative battery 
terminal

The lever moves 
from the MAX HOT 
position to the MAX 
COOL position

AC001049AB

MAX HOT POSITION

MAX 
COOL 
POSITION

REAR AIR CONDITIONING DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-61

STEP 8. Check rear A/C control unit connector E-20 and air 
mixing damper control motor and potentiometer G-26-2 for 
damage.
Q: Is rear heater control unit connector E-20 and air mixing 

damper control motor and potentiometer G-26-2 in good 
condition?
YES : Go to Step 9.
NO :  Repair or replace the connector. Refer to GROUP 

00E, Harness Connector Inspection 

P.00E-2

. Check 

that the rear air conditioning works normally.

AC204176

CONNECTOR : E-20

AY

HARNESS SIDE

7

8

3

10 9

2

4

11

1312

5

14

6

1

AC204698

CONNECTOR : G-26-2

AK

HARNESS SIDE

7 6 5 4 3 2 1

REAR AIR CONDITIONING DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-62

STEP 9. Check the wiring harness between rear A/C 
control unit connector E-20 (terminal 14, 6, 4, 7 and 8) and 
air mixing damper control motor and potentiometer G-26-2 
(terminal 2, 1, 5, 3 and 7).

AC204176

CONNECTOR : E-20

AY

HARNESS SIDE

7

8

3

10 9

2

4

11

1312

5

14

6

1

AC204699

CONNECTORS : G-26-1, G-26-2

AG

G-26-1

G-26-2

G-26-1

G-26-2

HARNESS SIDE

8

4

7

3

5

1

6

2

1
4

3
6 5

2

<VEHICLES WITH REAR AIR
  CONDITIONING SYSTEM>