Mitsubishi Outlander GS45X. Manual - part 1018

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-99

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TECHNICAL DESCRIPTION (COMMENT)

If the voltage is not supplied to the blower motor, the 
blower relay system may be failed.

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TROUBLESHOOTING HINTS

• Malfunction of the ETACS-ECU

• Malfunction of the blower relay

• Damaged harness wires or connectors

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB992006: Extra Fine Probe

STEP 1. Check blower relay connector C-303 for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.
Q: Is blower relay connector C-303 in good condition?

YES : Go to Step 2.
NO :  Repair or replace the connector. Refer to GROUP 

00E, Harness Connector Inspection 

P.00E-2

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AC702208AO

Connector: C-114

AC701632 AO

Connector: C-303, C-309, C-315

C-303

C-309 (B)

C-315

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-100

STEP 2. Check the blower relay continuity.
Follow the table below to check the blower relay for continuity.

Q: Is the blower relay in good condition?

YES : Go to Step 3.
NO :  Replace the rear window defogger relay.

STEP 3. Measure the voltage at blower relay connector 
C-303.
(1) Disconnect blower relay connector C-303, and measure the 

voltage at the junction block side.

(2) Measure the voltage between terminals 1 and ground.

• The measured value should be approximately 12 volts 

(battery positive voltage).

(3) Measure the voltage between terminals 4 and ground.

• The measured value should be approximately 12 volts 

(battery positive voltage).

Q: Is the measured voltage approximately 12 volts?

YES :  Go to Step 5.
NO :   Go to Step 4.

Battery voltage

Connect 
tester 
between

Specified 
condition

Not applied

3 

− 4

Open Circuit

• Connect terminal 1 to the 

positive battery terminal

• Connect terminal 2 to the 

negative battery terminal

3 

− 4

Less than 2 ohms

2

3

4

1

def

ay

AC702749AC

Blower relay

AC608254 CC

Harness side: C-303

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-101

STEP 4. Check the wiring harness between blower relay 
connector C-303 (terminals 1 and 4) and the fusible link 
(37).
NOTE: Also check ETACS-ECU connector C-309 for loose, 
corroded, or damaged terminals, or terminals pushed back in 
the connector. If ETACS-ECU connector C-309 is damaged, 
repair or replace the connector as described in GROUP 00E, 
Harness Connector Inspection 

P.00E-2

.

• Check the blower relay power supply line for open circuit.

Q: Is the wiring harness between blower relay connector 

C-303 (terminals 1 and 4) and the fusible link (37) in 
good condition?
YES : It can be assumed that this malfunction is intermittent. 

Refer to GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

− How to 

Cope with Intermittent Malfunctions 

P.00-15

.

NO :  Repair or replace the wiring harness. Refer to 

GROUP 00E, Harness Connector Inspection 

P.00E-2

.

STEP 5. Check blower relay connector C-114 for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.
Q: Is blower relay connector C-114 in good condition?

YES : Go to Step 6.
NO :  Repair or replace the connector. Refer to GROUP 

00E, Harness Connector Inspection 

P.00E-2

.

STEP 6. Check the wiring harness between blower relay 
connector C-303 (terminal 3) and blower motor connector 
C-114 (terminal 1).
NOTE: Also check ETACS-ECU connector C-315 for loose, 
corroded, or damaged terminals, or terminals pushed back in 
the connector. If ETACS-ECU connector C-315 is damaged, 
repair or replace the connector as described in GROUP 00E, 
Harness Connector Inspection 

P.00E-2

.

• Check the blower motor power supply line for open circuit.

Q: Is the wiring harness between blower relay connector 

C-303 (terminal 3) and blower motor connector C-114 
(terminal 1) in good condition?
YES : It can be assumed that this malfunction is intermittent. 

Refer to GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

− How to 

Cope with Intermittent Malfunctions 

P.00-15

.

NO :  Repair or replace the wiring harness. Refer to 

GROUP 00E, Harness Connector Inspection 

P.00E-2

.

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-102

DATA LIST REFERENCE TABLE

M1554005100910

Refer to GROUP 55B - Data list reference table 

P.55B-12

.)

ACTUATOR TEST REFERENCE

M1554005200865

Refer to GROUP 55B - Actuator test reference 

P.55B-17

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CHECK AT A/C-ECU TERMINAL

M1552010302233

32

24

29

21

31

30

2223

27

35

33

25

34

26

36

28

ZC603629AB

<C-109>

<C-108>

Terminal 
No.

Check items

Check conditions

Normal conditions

1

Power transistor (DRAIN)

Air volume control dial: Maximum air 
volume

0 to 2 V

2

Power transistor (GATE)

Air volume control dial: Maximum air 
volume

Battery positive voltage

3 

− 8

−

−

−

9

A/C control panel (input)

−

−

10 

− 12

−

−

−

13

Battery power supply

 Always

Battery positive voltage

14

Ground

 Always

1 V or less

15

IG1 power supply

Ignition switch: IG1

Battery positive voltage

16

A/C pressure sensor input

Refer to 

P.55A-107

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Refer to 

P.55A-107

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17

Interior temperature sensor

Sensor probe temperature: 25

°C 

(77

°F) (4.0 kΩ)

2.1 to 2.7 V

18

−

−

−

19

Sensor ground

Always

1 V or less

20

A/C pressure sensor power 
supply

Ignition switch: IG2

5 V

21

Fin thermo sensor ground

Always

1 V or less

22

Fin thermo sensor

Sensor probe temperature: 25

°C 

(77

°F) (4.0 kΩ)

2.1 to 2.7 V

23

−

−

−

24

Motor for air outside/inside 
air circulation switching 
damper

−

−

25

Motor for air outside/inside 
air circulation switching 
damper

−

−