Mitsubishi Montero (2004+). Manual - part 600

REAR AIR CONDITIONING DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-43

STEP 6. Check the wiring harness between rear cooler 
control unit connector E-09 (terminal 3, 4 and 8) and rear 
cooler switch connector E-17 (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 cooler control unit 

connector E-09 (terminal 3, 4 and 8) and rear cooler 
switch connector E-17 (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-09

AW

7

8

3

10 9

2

4

11

1312

5

14

6

1

HARNESS SIDE

AC204175

CONNECTOR : E-17

AE

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-44

STEP 7. Measure the voltage at rear cooler unit connector 
G-13. 

(1) Disconnect rear cooler unit connector G-13, and measure 

the voltage at the harness side.

(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between terminal 2 and ground.

• The measured value should be approximately 12 volts 

(battery positive voltage).

Q: Does the measured voltage correspond with this range?

YES :  Go to Step 10.
NO :   Go to Step 8.

STEP 8. Check rear cooler unit connector G-13 for 
damage.

Q: Is rear cooler unit connector G-13 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.

STEP 9. Check the wiring harness between rear cooler unit 
connector G-13 (terminal 2) and the ignition switch (IG2).

AC204179

CONNECTOR : G-13

AO

HARNESS SIDE

1

2

3

4

AC204738

HARNESS SIDE : G-13

CO

1

2

3

4

AC204179

CONNECTOR : G-13

AO

HARNESS SIDE

1

2

3

4

AC204179

CONNECTOR : G-13

AO

HARNESS SIDE

1

2

3

4

REAR AIR CONDITIONING DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-45

NOTE: Also check intermediate connector D-112, joint connec-
tor (6) D-01, junction block connectors D-210 and D-208. If 
intermediate connector D-112, joint connector (6) D-01, junc-
tion block connectors D-210 or D-208 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 cooler unit 

connector G-13 (terminal 2) and the ignition switch (IG2) 
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.

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

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

AC

HARNESS SIDE

HARNESS SIDE

D-210

D-208

D-210

1

2

3

5

6

4

1

2

7 6

3

9

4

11

12

10

13

5

8

REAR AIR CONDITIONING DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-46

STEP 10. Check the air thermo sensor.

When the resistance between the sensor terminals is mea-
sured at two or more temperature conditions, the resistance 
should satisfy the value shown in the illustration.
NOTE: The temperature condition at the check shall be within 
the range shown in the characteristic diagram.
Q: Does air thermo sensor work normally?

YES :  Go to Step 11.
NO :  Replace the air thermo sensor.

STEP 11. Check the expansion valve (magnet valve).

The valve is in normal condition if the actuation sound is heard 
from the magnet valve when battery voltage is applied to mag-
net valve terminal 1 and terminal 2 is grounded.
Q: Does expansion valve work normally?

YES :  Go to Step 12.
NO :  Replace the expansion valve (magnet valve).

STEP 12. Check rear cooler unit connector G-13 and 
magnetic valve connector G-13-2 for damage.

Q: Is rear cooler unit connector G-13 and magnetic valve 

connector G-13-2 in good condition?
YES : Go to Step 13.
NO :  Repair or replace the connector. Refer to GROUP 

00E, Harness Connector Inspection 

P.00E-2

. Check 

that the rear air conditioning works normally.

AC001043

RESISTANCE k

Ω

8

6

4

2

0

-10

0

 10

 20

 30

   40

TEMPERATURE ˚C(˚F)

AB

(14)

(32)

(50)

(86)

(104)

(68)

1 2

AC102582

AC204179

CONNECTOR : G-13

AO

HARNESS SIDE

1

2

3

4

AC204698

CONNECTOR : G-13-2

AC

HARNESS SIDE

2 1