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>