Mitsubishi Outlander (2003+). Manual - part 536

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55A-39

INSPECTION PROCEDURE 6: The A/C Indicator Flashes.

COMMENTS ON TROUBLE SYMPTOM
If the A/C indicator flashes then the possible causes 
may be due to a defective A/C pressure system or 
insufficient refrigerant gas.

TROUBLESHOOTING HINTS

•

Malfunction of the A/C pressure sensor

•

Malfunction of the air thermo sensor

•

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

DIAGNOSIS

STEP 1. Check the A/C pressure sensor 
operation.
Refer to 

P.55A-51

.

Q: Is the A/C pressure sensor operating properly?

YES : 

Go to Step 2.

NO : 

Replace the A/C pressure sensor.

STEP 2. Check the air thermo sensor.
Refer to 

P.55A-69

.

Q: Is the air thermo sensor in good condition?

YES : 

Go to Step 3.

NO : 

Replace the air thermo sensor.

STEP 3. Check the refrigerant level.
Refer to 

P.55A-51

.

Q: Is the refrigerant level correct?

YES : 

Replace the manual air conditioner control 

panel (A/C-ECU).

NO : 

Correct the refrigerant level (Refer to 

P.55A-56

).

AIR THERMO 
SENSOR

AIR THERMO 
SENSOR

A/C PRESSURE 
SENSOR

A/C-ECU

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   

(OUTLET SIDE)

(INLET SIDE)

A/C Pressure Sensor and Air Thermo Sensor Circuit

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55A-40

INSPECTION PROCEDURE 8: Defogger Function does not Operate.

COMMENTS ON TROUBLE SYMPTOM
If the defogger does not operate when the defogger 
switch is turned on, the defogger relay system may 
be defective.

TROUBLESHOOTING HINTS

•

Malfunction of the defogger relay

•

Malfunction of the defogger

•

Damaged the wiring harness or connectors

•

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

DIAGNOSIS

STEP 1. Check the A/C and outside/inside air 
selection damper control motor operation.

Q: Do the A/C and outside/inside air selection damper 

control motor work normally?
YES : 

Go to Step 2.

NO : 

Refer to Inspection procedure 9 
"Malfunction of the A/C-ECU Power Supply 
system 

P.55A-47

."

STEP 2. Measure the voltage at defogger 
connector F-04. 

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   

IGNITION
SWITCH (IG2)

FUSIBLE
LINK

1

DEFOGGER
RELAY

DEFOGGER
SWITCH

DEFOGGER

A/C-ECU

Defogger Circuit

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55A-41

(1) Disconnect the connector, and measure at the 

wiring harness side.

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

(operate for approx. 11 minutes)

(4) Measure the voltage between terminal 1 and 

body earth.

OK: System voltage

Q: Is the check result normal?

YES : 

 Go to Step 14.

NO : 

 Go to Step 3.

STEP 3. Check the defogger relay continuity.
Refer to 

P.55A-57

.

Q: Is the Defogger relay continuity in good condition?

YES : 

Go to Step 4.

NO : 

Replace the defogger relay.

STEP 4. Measure the voltage at defogger relay 
connector C-206. 

(1) Remove the relay, and measure at the junction 

block side.

(2) Measure the voltage between terminal 5 and 

body earth.

OK: System voltage

Q: Is the check result normal?

YES : 

 Go to Step 7.

NO : 

 Go to Step 5.

STEP 5. Connector check: C-206 defogger relay 
connector

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Repair the connector.

AC301658

Harness side

Connector: F-04

AB

F-04(B)

1

AC301541CE

Connector F-04
(Harness side)

1

AC210474

Connector: C-206

AK

Junction block (Front view)

3

4

5

1

2

Junction block side

AC301541CF

Connector C-206
(Junction block side)

3

4

5

1

2

AC210474

Connector: C-206

AK

Junction block (Front view)

3

4

5

1

2

Junction block side

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55A-42

STEP 6. Check the wiring harness between C-206 
defogger relay connector terminal No.5 and the 
fusible link (1).

NOTE: 

Prior to the wiring harness inspection, check 
intermediate connector C-116 and junction block 
connector C-204, and repair if necessary.

•

Check the defogger 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.

STEP 7. Measure the voltage at defogger relay 
connector C-206. 

(1) Remove the relay, and measure at the junction 

block side.

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

(3) Measure the voltage between terminal 1 and 

earth.

OK: System voltage

Q: Is the check result normal?

YES : 

 Go to Step 10.

NO : 

 Go to Step 8.

AC210475

Connectors: C-204, C-206

AV

Junction block (Front view)

C-206

C-204(B)

Harness side

C-204

3

4

5

1

2

Junction block side

C-206

1

AC301515 AB

Fusible link: No.1

AC301395AG

9

21

33

35

24

12

3 4

7

8

5 6

39

28

41

30

18

4243

31

1920

32

40

29

1617

38

27

15

37

36

26

14

13

25

2

1

34

23

11

10

22

Connector: C-116

AC210474

Connector: C-206

AK

Junction block (Front view)

3

4

5

1

2

Junction block side

AC301541CG

Connector C-206
(Junction block side)

3

4

5

1

2