Mitsubishi Outlander (2003+). Manual - part 553

TROUBLESHOOTING

AUTOMATIC AIR CONDITIONER

55B-27

Step 3. Check the wiring harness between C-26 
A/C-ECU connector (terminals 21 and 24) and 
C-315 mode selection damper control motor and 
potentiometer connector (terminals 3 and 1).

NOTE: Prior to the wiring harness inspection, check 
intermediate connector C-36, and repair if necessary.

•

Check the motor activating lines for open or short 
circuit.

Q: Is the check result normal?

YES : 

Replace the automatic air conditioner 

control panel (A/C-ECU).

NO : 

Repair the wiring harness.

AC301398

Connectors: C-26, C-36 <LHD>

C-26

C-36

BI

C-36

Harness side

1 2

4

3

12

11

10

9

8

7

6

13

5

29

21

35

27

24

323130

22

23

33

25

34

26

36

28

C-26(B)

AC308736

Connectors: C-26, C-36 <RHD>

C-26

C-36

AL

C-36

Harness side

1 2

4

3

12

11

10

9

8

7

6

13

5

29

21

35

27

24

323130

22

23

33

25

34

26

36

28

C-26(B)

AC309435

Connector: C-315 <LHD>

AE

Harness side

2
6 5

1
3

4

AC308739

Connector: C-315 <RHD>

AF

Harness side

2
6 5

1
3

4

TROUBLESHOOTING

AUTOMATIC AIR CONDITIONER

55B-28

TROUBLE SYMPTOM CHART

M1554005000214

SYMPTOM PROCEDURES

INSPECTION PROCEDURE 1: Communication with the MUT-II/III is not possible.

Symptom

Inspection procedure 
number

Reference page

Communication with the MUT-II is not possible.

1

P.55B-28

The air conditioner does not work at all.

2

P.55B-31

 <4G63>, 

P.55B-43

 <4G69>

A/C outlet air temperature cannot be set. 

3

P.55B-56

The blower does not work.

4

P.55B-57

The blower air volume cannot be changed.

5

P.55B-68

When sunlight intensity changes, air outlet temperature 
does not change.

6

P.55B-70

The A/C indicator flashes.

7

P.55B-72

The inside/outside air changeover is impossible.

8

P.55B-73

Defogger function does not operate.

9

P.55B-78

Malfunction of the A/C-ECU power supply system.

10

P.55B-88

A/C-ECU

DIAGNOSIS 
CONNECTOR

FRONT SIDE

Wire colour code
B : Black     LG : Light green     G : Green     L : Blue     W : White     Y : Yellow     SB : Sky blue
BR : Brown     O : Orange     GR : Gray     R : Red     P : Pink     V : Violet   

Data Link Connector Circuit

TROUBLESHOOTING

AUTOMATIC AIR CONDITIONER

55B-29

COMMENTS ON TROUBLE SYMPTOM
If communication with all other systems is not 
possible, there is a high possibility that there is a 
malfunction of the diagnosis line. If only the A/C 
system can not communicate with the MUT-II/III, the 
diagnosis line between the A/C-ECU and the 
diagnosis connector may be defective.

Possible causes

•

Damaged the wiring harness or connectors

•

Malfunction of the automatic air conditioner 
control panel (A/C-ECU)

DIAGNOSIS

Step 1. Check the communication with other 
systems.

Q: Is the communication with the other systems 

possible using the MUT-II/III?

YES : 

Go to Step 2.

NO : 

Check the diagnosis line using the 
MUT-II/III, and repair if necessary.

STEP 2. Check operations of the air conditioner, 
defogger and outside/inside air selection damper 
control motor.

Q: Does the air conditioner, defogger or 

outside/inside air selection damper control motor 
operate?

YES : 

Go to Step 3.

NO : 

Refer to Inspection procedure 10 
"Malfunction of the A/C-ECU power supply 
system 

P.55B-88

."

Step 3. Connector check: C-27 A/C-ECU 
connector and C-24 diagnosis connector

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Repair the connector.

AC301395AV

C-24(B)

1
9 10

2

4

12

11

3

13

5

7

15

14

6

16

8

Connector: C-24 <LHD>

Harness side

AC308769

AB

C-24(B)

1
9 10

2

4

12

11

3

13

5

7

15

14

6

16

8

Connector: C-24

Harness side

<RHD>

AC301397

Connector: C-27 
<LHD>

AX

C-27(B)

Harness side

8

2

10 9

1

5

3

4

6

7

20191817161514131211

AC308735

Connector: C-27 <RHD>

AY

C-27(B)

Harness side

8

2

10 9

1

5

3

4

6

7

20191817161514131211

TROUBLESHOOTING

AUTOMATIC AIR CONDITIONER

55B-30

Step 4. Check the wiring harness between C-27 
A/C-ECU connector (terminal 17 and 18) and C-24 
diagnosis connector (terminal 11 and 1).

•

Check the communication lines for open or short 
circuit.

Q: Is the check result normal?

YES : 

Replace the automatic air conditioner 

control panel (A/C-ECU).

NO : 

Repair the wiring harness.

AC301395AV

C-24(B)

1
9 10

2

4

12

11

3

13

5

7

15

14

6

16

8

Connector: C-24 <LHD>

Harness side

AC308769

AB

C-24(B)

1
9 10

2

4

12

11

3

13

5

7

15

14

6

16

8

Connector: C-24

Harness side

<RHD>

AC301397

Connector: C-27 
<LHD>

AX

C-27(B)

Harness side

8

2

10 9

1

5

3

4

6

7

20191817161514131211

AC308735

Connector: C-27 <RHD>

AY

C-27(B)

Harness side

8

2

10 9

1

5

3

4

6

7

20191817161514131211