Mitsubishi Montero (2004+). Manual - part 604

REAR AIR CONDITIONING DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-59

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

Q: Is rear heater control unit connector E-20 and air mixing 

damper control motor and potentiometer connector 
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-60

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>

REAR AIR CONDITIONING DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-61

NOTE: Also check intermediate connectors G-26-1, D-112, 
rear heater unit connectors G-26 and G-24. If intermediate con-
nector G-26-1, D-112, rear heater unit connector G-26 or G-24 
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 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) in good condition?
YES : Go to Step 10.
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

AC204197

CONNECTORS : G-24, G-26
 <VEHICLES WITH AIR 
     CONDITIONING SYSTEM>

AD

G-24

G-26

G-24

HARNESS SIDE

G-26

HARNESS SIDE

1

2

3

4

2

4 3

1

REAR AIR CONDITIONING DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-62

STEP 10. Measure the voltage at rear A/C unit connector 
G-24. 

(1) Disconnect rear A/C unit connector G-24, 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 13.
NO :   Go to Step 11.

STEP 11. Check rear A/C unit connector G-24 for damage.

Q: Is rear A/C unit connector G-24 in good condition?

YES : Go to Step 12.
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 12. Check the wiring harness between rear A/C unit 
connector G-24 (terminal 2) and the ignition switch (IG2).

AC204179

CONNECTOR : G-24

AQ

HARNESS SIDE

1

2

3

4

AC204738

HARNESS SIDE : G-24

CP

1

2

3

4

AC204179

CONNECTOR : G-24

AQ

HARNESS SIDE

1

2

3

4

AC204179

CONNECTOR : G-24

AQ

HARNESS SIDE

1

2

3

4