Mitsubishi Outlander GS45X. Manual - part 1013

MANUAL A/C DIAGNOSIS

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HEATER, AIR CONDITIONING AND VENTILATION

55A-79

STEP 2. Measure the voltage at blower motor connector 
C-114. 
(1) Disconnect blower motor connector C-114, and measure 

the voltage at the wiring harness side.

(2) Turn the ignition switch to the "ON" position.
(3) Turn the blower switch to the "Maximum air volume" 

position.

(4) Measure the voltage between terminal 1 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 3.
NO :  Refer to Inspection procedure 10, "Blower motor 

power supply system 

P.55A-98

."

STEP 3. Check blower motor connector C-114 for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.
Q: Is blower motor connector C-114 in good condition?

YES : Go to Step 4.
NO :  Repair or replace the connector. Refer to GROUP 

00E, Harness Connector Inspection 

P.00E-2

.The 

blower motor should operate normally.

STEP 4. Check the blower fan and motor operation.
When battery voltage is applied between the terminals, check 
that the motor operates. Also, check that there is no abnormal 
noise.
Q: Is there any abnormal noise?

YES : Go to Step 5.
NO :  Replace the blower relay. The blower motor should 

operate normally.

STEP 5. Check A/C-ECU connector C-109 for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.
Q: Is A/C-ECU connector C-109 in good condition?

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

00E, Harness Connector Inspection 

P.00E-2

.The 

blower motor should operate normally.

AC608254 EA

Harness side: C-114

AC702639

MANUAL A/C DIAGNOSIS

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HEATER, AIR CONDITIONING AND VENTILATION

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STEP 6. Check the wiring harness between A/C-ECU 
connector C-109 (terminal 1) and blower motor connector 
C-114 (terminal 2).

• Check the AC-ECU signal line for open and short circuit.

Q: Is the wiring harness between A/C-ECU connector 

C-109 (terminal 1) and blower motor connector C-114 
(terminal 2) in good condition?
YES : Go to Step 7.
NO :  Repair the wiring harness. The blower motor should 

operate normally.

STEP 7. Check power transistor connector C-120 for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.
Q: Is power transistor connector C-120 in good condition?

YES : Go to Step 8.
NO :  Repair or replace the connector. Refer to GROUP 

00E, Harness Connector Inspection 

P.00E-2

.The 

blower motor should operate normally.

STEP 8. Measure the resistance at power transistor 
connector C-120.
(1) Disconnect power transistor connector C-120, and measure 

the resistance at the wiring harness side.

(2) Measure the resistance value between terminal 1 and 

ground.

OK: The measured value should be 2 ohms or less

Q: Does the measured resistance value correspond with 

this range?
YES :  Go to Step 10.
NO :   Go to Step 9.

STEP 9. Check the wiring harness between power 
transistor connector C-120 (terminal 1) and ground.

• Check the power transistor ground line for open circuit.

Q: Is the wiring harness between power transistor 

connector C-120 (terminal 1) and ground 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 the wiring harness. The blower motor should 

operate normally.

AC608812EG

Harness side: C-120

MANUAL A/C DIAGNOSIS

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HEATER, AIR CONDITIONING AND VENTILATION

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STEP 10. Check the wiring harness between A/C-ECU 
connector C-109 (terminals 1,2 and 14) and power 
transistor connector C-120 (terminals 2 and 4).

• Check the AC-ECU signal line for open and short circuit.

Q: Is the wiring harness between A/C-ECU connector 

C-109 (terminals 1 and 2) and power transistor 
connector C-120 (terminals 2 and 4) in good condition?
YES : Go to Step 11.
NO :  Repair the wiring harness. The blower motor should 

operate normally.

STEP 11. Replace the power transistor and check the 
trouble symptom again
Check the trouble symptom again.
Q: Is the check result satisfactory?

YES : The procedure is complete.
NO :  Replace the A/C-ECU.

MANUAL A/C DIAGNOSIS

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INSPECTION PROCEDURE 5: Blower Air Amount cannot be Changed.

37

BLOWER 
RELAY

ACA02729

A/C-ECU

Blower Motor Circuit

FUSIBLE 
LINK

ETACS-
ECU

BLOWER 
MOTOR

POWER 
TRANSISTOR