Mitsubishi Montero (2004+). Manual — part 597

REAR AIR CONDITIONING DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-31

STEP 2. Measure the resistance at rear heater control unit
connector E-01.

(1) Disconnect rear heater control unit connector E-01, and

measure at the wiring harness side.

(2) Turn the rear fan switch to the "ON" position.
(3) Turn the rear fan control switch to the "OFF" position.

(4) Measure the resistance between terminal 13 and ground.

• The measured value should be 2 ohms or less.

Q: Does the measured resistance value correspond with

this range?
YES : Go to Step 5.
NO : Go to Step 3.

STEP 3. Check rear heater control unit connector E-01 and
rear fan control switch connector E-12 for damage.

Q: Is rear heater control unit connector E-01 and rear fan

control switch connector E-12 in good condition?
YES : Go to Step 4.
NO : Repair or replace the connector. Refer to GROUP

00E, Harness Connector Inspection

P.00E-2

. Check

that the air conditioning works normally.

AC204176

CONNECTOR : E-01

AU

HARNESS SIDE

7

8

3

10 9

2

4

11

1312

5

14

6

1

AC204738

7

8

3

10 9

2

4

11

1312

5

14

6

1

CG

HARNESS SIDE : E-01

AC204194

CONNECTORS : E-01, E-12

AL

E-01

E-01

E-12

HARNESS SIDE

E-12

HARNESS SIDE

7

8

3

10 9

2

4

11

1312

5

14

6

1

1
4

2

3

5

6

REAR AIR CONDITIONING DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-32

STEP 4. Check the wiring harness between rear heater
control unit connector E-01 (terminal 13) and rear fan
control switch connector E-12 (terminal 1).

NOTE: Also check intermediate connector E-06. If intermediate
connector E-06 is damaged, repair or replace the connector as
described in GROUP 00E, Harness Connector Inspection

P.00E-2

.

Q: Is the wiring harness between rear heater control unit

connector E-01 (terminal 13) and rear fan control switch
connector E-12 (terminal 1) in good condition?
YES : Check that the rear air conditioning works normally.
NO : Repair the wiring harness. Check that the rear air

conditioning works normally.

AC204194

CONNECTORS : E-01, E-06, E-12

AZ

E-01

E-01

E-12

HARNESS SIDE

HARNESS SIDE

E-12

E-06

E-06

7

8

3

10 9

2

4

11

1312

5

14

6

1

1
4

2

3

5

6

22

2021

10

9

8

1718

6 7

19

1415

4 5

1112

1 2 3

13

16

REAR AIR CONDITIONING DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-33

STEP 5. Check rear heater control unit connector E-01 and
rear heater switch E-21 for damage.

Q: Is rear heater control unit connector E-01 and rear

heater switch E-21 in good condition?
YES : Go to Step 6.
NO : Repair or replace the connector. Refer to GROUP

00E, Harness Connector Inspection

P.00E-2

. Check

that the rear air conditioning works normally.

STEP 6. Check the wiring harness between rear heater
control unit connector E-01 (terminal 3, 4 and 8) and rear

heater switch connector E-21 (terminal 5, 3 and 13).

AC204176

CONNECTOR : E-01

AU

HARNESS SIDE

7

8

3

10 9

2

4

11

1312

5

14

6

1

AC204175

CONNECTOR : E-21

AF

HARNESS SIDE

FLOOR
COSOLE

1
7

2
8

10

11

5

13

6

14

12

4

9

3

AC204176

CONNECTOR : E-01

AU

HARNESS SIDE

7

8

3

10 9

2

4

11

1312

5

14

6

1

AC204175

CONNECTOR : E-21

AF

HARNESS SIDE

FLOOR
COSOLE

1
7

2
8

10

11

5

13

6

14

12

4

9

3

REAR AIR CONDITIONING DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-34

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 heater control unit

connector E-01 (terminal 3, 4 and 8) and rear heater
switch connector E-21 (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.

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.

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

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