Mitsubishi Outlander (2003+). Manual - part 530

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55A-15

STEP 10. Connector check: B-18X A/C 
compressor relay connector

Q:  Is the check result normal?

YES : 

Go to Step 11.

NO : 

Repair the connector.

STEP 11. 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 interme-
diate 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 : 

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.

AC309476AB

Front of 
vehicle

Relay box side

1

3

2

4

B-18X

-

Connector: B-18X

AC309476AB

Front of 
vehicle

Relay box side

1

3

2

4

B-18X

-

Connector: B-18X

AC308679 AG

A-14(GR)

Connector: A-14 <LHD>

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55A-16

STEP 12. 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 13.

NO : 

Repair the connector.

STEP 13. 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 power supply line for 
open circuit.

Q: Is the check result normal?

YES <2000> : 

Go to Step 14.

YES <2400> : 

Go to Step 16.

NO : 

Repair the wiring harness.

AC309476AB

Front of 
vehicle

Relay box side

1

3

2

4

B-18X

-

Connector: B-18X

AC308688

Connector: B-27 <2000>

Harness side

1

B-27(B)

AB

AC308706

Connector: B-27 
<2400-LHD>

Harness side

1

B-27(B)

AB

AC309476AB

Front of 
vehicle

Relay box side

1

3

2

4

B-18X

-

Connector: B-18X

AC308688

Connector: B-27 <2000>

Harness side

1

B-27(B)

AB

AC308706

Connector: B-27 
<2400-LHD>

Harness side

1

B-27(B)

AB

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55A-17

STEP 14. Connector check: C-134 engine-ECU 
connector and B-18X A/C compressor relay 
connector

Q:  Is the check result normal?

YES : 

Go to Step 15.

NO : 

Repair the connector.

STEP 15. Check the wiring harness between 
C-134 engine-ECU connector terminal No.8 and 
B-18X A/C compressor relay connector terminal 
No.2.

•

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

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.

AC309476AB

Front of 
vehicle

Relay box side

1

3

2

4

B-18X

-

Connector: B-18X

AC309474AB

Connector: C-134 <2000>

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

AC309474AB

Connector: C-134 <2000>

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

AC309476AB

Front of 
vehicle

Relay box side

1

3

2

4

B-18X

-

Connector: B-18X

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55A-18

STEP 16. Connector check: C-139 engine-ECU or 
engine-A/T-ECU connector and B-18X A/C 
compressor relay connector

Q:  Is the check result normal?

YES : 

Go to Step 17.

NO : 

Repair the connector.

STEP 17. Check the wiring harness between 
C-139 engine-ECU or engine-A/T-ECU connector 
terminal No.8 and B-18X A/C compressor relay 
connector terminal No.2.

•

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

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.

AC309476AB

Front of 
vehicle

Relay box side

1

3

2

4

B-18X

-

Connector: B-18X

AC309486

Connector: C-139 <2400-LHD>

AC

Harness side

C-139 (GR)

AC309486

Connector: C-139 <2400-LHD>

AC

Harness side

C-139 (GR)

AC309476AB

Front of 
vehicle

Relay box side

1

3

2

4

B-18X

-

Connector: B-18X