Mitsubishi Galant 9G. Manual - part 288

 

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Mitsubishi Galant 9G. Manual - part 288

 

 

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-228

STEP 7. Check the refrigerant level.
Use the refrigerant recovery station to remove all of the refrig-
erant, and then calculate the amount of the refrigerant and 
charge it.
Q: Is the refrigerant level correct?

YES : Replace the A/C-ECU.Check that the air conditioning 

works normally. 

NO :  Correct the refrigerant level (Refer to On-vehicle 

Service

P.55A-262

). Check that the air conditioning 

works normally. 

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-229

INSPECTION PROCEDURE 8: Defogger Function Does Not Operate.

IGNITION
SWITCH (IG2)

1

FUSIBLE
LINK

REAR
WINDOW
DEFOGGER
RELAY

CAPACITOR

REAR WINDOW
DEFOGGER

A/C-
ECU

Rear Window Defogger Circuit

JUNCTION
BLOCK

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-230

.

TECHNICAL DESCRIPTION (COMMENT)

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 A/C-ECU

• Malfunction of the defogger relay

• Damaged harness wires or connectors

DIAGNOSIS

Required Special Tool:

• MB991223: Test Harness Set

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 10, "Malfunction of the 

A/C-ECU power supply system

P.55A-242

."

AC305233

C-15 (B)

BI

CONNECTOR: C-15

AC305415

JUNCTION BLOCK 
(FRONT VIEW) 

C-204

C-211

C-215

C-201

C-216 (B)

BF

CONNECTORS: C-201, C-204, C-211
C-215, C-216

AC305231CH

CONNECTOR: C-29

AC305268

CONNECTORS: D-08, D-11, D-13, D-14

D-08

D-11

D-13

D-14

AO

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-231

STEP 2. Check defogger relay connector C-201 for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.
Q: Is defogger relay  connector C-201 in good condition?

YES : Go to Step 3.
NO :  Repair or replace the connector. Refer to GROUP 

00E, Harness Connector Inspection 

P.00E-2

. The 

defogger system should work normally.

STEP 3. Check the defogger relay continuity.
Follow the table below to check the defogger relay for continu-
ity.

Q: Is the defogger relay in good condition?

YES : Go to Step 4.
NO :  Replace the defogger relay. The defogger system 

should work normally.

STEP 4. Check defogger relay connector D-14 for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.
Q: Is defogger relay  connector D-14  in good condition?

YES : Go to Step 5.
NO :  Repair or replace the connector. Refer to GROUP 

00E, Harness Connector Inspection 

P.00E-2

. The 

defogger system should work normally.

AC305415BE

CONNECTOR: C-201

JUNCTION BLOCK SIDE

JUNCTION BLOCK 
(FRONT VIEW)

BATTERY VOLTAGE CONNECT 

TESTER 
BETWEEN

SPECIFIED 
CONDITION

Not applied

− 5

Open Circuit

• Connect terminal 1 

to the positive 
battery terminal

• Connect terminal 3 

to the negative 
battery terminal

− 5

Less than 2 ohms

AC209677

4

5

1 2 3

5

1

4

3

DEFOGGER RELAY

AD

AC305268

CONNECTOR: D-14

AJ

HARNESS SIDE

 

 

 

 

 

 

 

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