Mitsubishi Outlander (2003+). Manual - part 555

TROUBLESHOOTING

AUTOMATIC AIR CONDITIONER

55B-35

STEP 11. Connector check: B-18X A/C 
compressor relay connector

Q:  Is the check result normal?

YES : 

 Go to Step 12.

NO : 

Repair the connector.

STEP 12. Check the wiring harness between 
B-18X A/C compressor relay connector terminal 
No.4 and the battery.

NOTE: 

Prior to the wiring harness inspection, check 
intermediate connector A-14, and repair if necessary.

•

Check the A/C compressor relay power supply 
line for open circuit.

Q: Is the check result normal?

YES : 

Check that the air conditioner works 

normally.

NO : 

Repair the wiring harness. Check that the 
air conditioner works normally.

AC301483AG

Front of 
vehicle

Relay box side

1

3

2

4

B-18X

-

Connector: B-18X

AC301483AG

Front of 
vehicle

Relay box side

1

3

2

4

B-18X

-

Connector: B-18X

AC301653

9

8

12 13

1

2

14

3

4

10

15

16

5

6

11

17

7

Connector: A-14

A-14(GR)

AB

TROUBLESHOOTING

AUTOMATIC AIR CONDITIONER

55B-36

STEP 13. Connector check: B-18X A/C 
compressor relay connector and B-27 A/C 
compressor connector

Q:  Is the check result normal?

YES : 

Go to Step 14.

NO : 

Repair the connector.

STEP 14. Check the wiring harness between 
B-18X A/C compressor relay connector terminal 
No.1 and B-27 A/C compressor connector 
terminal No.1.

•

Check the A/C compressor relay power supply 
line for open circuit.

Q: Is the check result normal?

YES : 

Go to Step 15.

NO : 

Repair the wiring harness.

AC301483AG

Front of 
vehicle

Relay box side

1

3

2

4

B-18X

-

Connector: B-18X

AC301648

Connector: B-27

Harness side

1

B-27(B)

AB

AC301483AG

Front of 
vehicle

Relay box side

1

3

2

4

B-18X

-

Connector: B-18X

AC301648

Connector: B-27

Harness side

1

B-27(B)

AB

TROUBLESHOOTING

AUTOMATIC AIR CONDITIONER

55B-37

STEP 15. Connector check: C-134 engine-ECU 
connector and B-18X A/C compressor relay 
connector

•

Check the A/C compressor relay earth line for 
open circuit.

Q:  Is the check result normal?

YES : 

Go to Step 16.

NO : 

Repair the connector.

STEP 16. Check the wiring harness between 
C-134 engine-ECU connector terminal No.8 and 
B-18X A/C compressor relay connector terminal 
No.2.

Q: Is the check result normal?

YES : 

The trouble can be an intermittent 

malfunction (Refer to GROUP 00, How to 
Cope with Intermittent Malfunction 

P.00-6

).

NO : 

Repair the wiring harness.

AC301397

Connector: C-134

AO

Harness side

22

9

14

15

2 1

3

16

1918

5 4

17

6

21

7

20

8

25

12

10

23

11

24

26

13

JAE-E

AC301483AG

Front of 
vehicle

Relay box side

1

3

2

4

B-18X

-

Connector: B-18X

AC301483AG

Front of 
vehicle

Relay box side

1

3

2

4

B-18X

-

Connector: B-18X

AC301397

Connector: C-134

AO

Harness side

22

9

14

15

2 1

3

16

1918

5 4

17

6

21

7

20

8

25

12

10

23

11

24

26

13

JAE-E

TROUBLESHOOTING

AUTOMATIC AIR CONDITIONER

55B-38

STEP 17. Measure the voltage at C-26 A/C-ECU 
connector. 

(1) Disconnect the connector, and measure at the 

wiring harness side.

(2) Turn the ignition switch to the "ON" position.
(3) Disconnect engine-ECU connector C-134 and 

earth terminal 8.

(4) Continuity between terminal 33 and body earth.

OK: System voltage

Q: Is the check result normal?

YES : 

 Go to Step 20.

NO : 

 Go to Step 18.

STEP 18. Connector check: B-18X A/C 
compressor relay connector and C-26 A/C-ECU 
connector

Q:  Is the check result normal?

YES : 

Go to Step 19.

NO : 

Repair the connector.

AC301398

Connectors: C-26, C-134

C-134

BA

Harness side

22

9

14

15

2 1

3

16

1918

5 4

17

6

21

7

20

8

25

12

10

23

11

24

26

13

JAE-E

C-134

C-26(B)

29

21

35

27

24

323130

22

23

33

25

34

26

36

28

C-26

AC301541CP

Connector C-26
(Harness side)

29

21

35

27

24

323130

22

23

33

25

34

26

36

28

AC301483AG

Front of 
vehicle

Relay box side

1

3

2

4

B-18X

-

Connector: B-18X

AC301397

Connector: C-26 
<LHD>

AY

Harness side

C-26(B)

29

21

35

27

24

323130

22

23

33

25

34

26

36

28

AC308735

Connector: C-26 <RHD>

AZ

Harness side

C-26(B)

29

21

35

27

24

323130

22

23

33

25

34

26

36

28