Mitsubishi Outlander GS45X. Manual - part 1017

MANUAL A/C DIAGNOSIS

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HEATER, AIR CONDITIONING AND VENTILATION

55A-95

STEP 9. Check ETACS-ECU connector C-301 for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.
Q: Is ETACS-ECU connector C-301 in good condition?

YES : Go to Step 10.
NO :  Repair or replace the connector. Refer to GROUP 

00E, Harness Connector Inspection 

P.00E-2

. Check 

that the rear window defogger system works normally.

STEP 10. Check the wiring harness between rear window 
defogger relay connector C-306 (terminal 1) and 
ETACS-ECU C-301 (terminal 12).

• Check the rear window defogger relay power supply line for 

open circuit.

Q: Is the wiring harness between rear window defogger 

relay connector C-306 (terminal 1) and ETACS-ECU 
C-301 (terminal 12) in good condition?
YES : Check that the rear window defogger system works 

normally.

NO :  Repair the wiring harness. Check that the rear 

window defogger system works normally.

STEP 11. Check the wiring harness between rear window 
defogger relay connector C-306 (terminal 2) and 
A/C-control panel connector C-119 (terminal 6).

• Check the A/C-ECU signal line for open and short circuit.

Q: Is the wiring harness between rear window defogger 

relay connector C-306 (terminal 2) and A/C-control panel 
connector C-119 (terminal 6) in good condition?
YES : Go to Step 12.
NO :  Repair or replace the wiring harness. Refer to 

GROUP 00E, Harness Connector Inspection 

P.00E-2

. Check that the rear window defogger 

system works normally.

MANUAL A/C DIAGNOSIS

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HEATER, AIR CONDITIONING AND VENTILATION

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STEP 12. Check the wiring harness between rear window 
defogger relay connector C-306 (terminal 3) and rear 
window defogger connector F-20 (terminal 1).
NOTE: Also check intermediate connector C-32 and D-12 for 
loose, corroded, or damaged terminals, or terminals pushed 
back in the connector. If intermediate connector C-32 and D-12 
is damaged, repair or replace the connector as described in 
GROUP 00E, Harness Connector Inspection 

P.00E-2

.

• Check the rear window defogger power supply line for open 

circuit.

Q: Is the wiring harness between rear window defogger 

relay connector C-306 (terminal 3) and rear window 
defogger connector F-20 (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

. Check that the rear window defogger 

system works normally.

STEP 13. Check rear window defogger connector F-05 for 
loose, corroded or damaged terminals, or terminals 
pushed back in the connector.
Q: Is rear window defogger connector F-05 in good 

condition?
YES : Go to Step 14.
NO :  Repair or replace the connector. Refer to GROUP 

00E, Harness Connector Inspection 

P.00E-2

. Check 

that the rear window defogger system works normally.

STEP 14. Measure the resistance at rear window defogger 
connector F-05.
(1) Disconnect rear window defogger connector F-05, and 

measure at the wiring harness side.

(2) Measure the resistance between terminal 1 and ground.

• The measured value should be 2 ohms or less.

Q: Does the measured resistance value correspond with 

this range?
YES : Go to Step 16.
NO :  Go to Step 15.

AC608254CB

Harness side: F-05

MANUAL A/C DIAGNOSIS

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HEATER, AIR CONDITIONING AND VENTILATION

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STEP 15. Check the wiring harness between rear window 
defogger connector F-05 (terminal 1) and the ground.

• Check the rear window defogger ground line for open cir-

cuit.

Q: Is the wiring harness between rear window defogger 

connector F-05 (terminal 1) and the ground in good 
condition?
YES : Check that the rear window defogger system works 

normally.

NO :  Repair or replace the wiring harness. Refer to 

GROUP 00E, Harness Connector Inspection 

P.00E-2

. Check that the rear window defogger 

system works normally.

STEP 16. Check the rear window defogger.
(1) Let the engine run at 2,000 r/min, and check the printed 

heater with the battery fully charged.

(2) Turn on the rear window defogger switch, and use a 

voltmeter to measure the voltage in each printed heater at 
middle point A on the rear window glass.

• The value should be approximately 6 volts.

Q: Does the rear window defogger work normally? 

YES : Replace the A/C-ECU. Check that the rear window 

defogger system works normally.

NO :  Repair the rear window defogger.

AC407247

Positive
terminal

Voltage (V)

Voltage (V)

Normal characteristic curve

Abnormal characteristic curve

Printed
heater
line

A (Center point)

Negative
terminal

Positive
terminal

Printed
heater
line

Negative
terminal

12

6

12

6

Open circuit
point

AE

MANUAL A/C DIAGNOSIS

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HEATER, AIR CONDITIONING AND VENTILATION

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INSPECTION PROCEDURE 10: Blower Motor power supply system.

37

BLOWER 
RELAY

ACA02729

A/C-ECU

Blower Motor Circuit

FUSIBLE 
LINK

ETACS-
ECU

BLOWER 
MOTOR

POWER 
TRANSISTOR