Mitsubishi Galant (2004+). Manual - part 270

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-271

STEP 4. Check the windshield wiper motor.

(1) Disconnect windshield wiper motor connector A-03.

(2) Connect a battery to the windshield wiper motor as shown. 

Then check that the windshield wiper motor operates 
normally at high and low speeds.

Q: Does the windshield wiper motor operate normally?

YES : Go to Step 5.
NO :  Replace the windshield wiper motor. Verify that the 

windshield wiper works normally.

AC305206

A-03 (B)

HARNESS SIDE

CONNECTOR: A-03

AH

AC306750

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5

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2

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5

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5

CHECK OPERATION

LOW SPEED

HIGH SPEED

AB

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-272

STEP 5. Check the ground circuit to the windshield wiper 
motor. Measure the resistance at the windshield wiper 
motor connector A-03.

(1) Disconnect windshield wiper motor connector A-03 and 

measure the resistance available at the wiring harness side 
of the connector.

(2) Measure the resistance value between terminal 5 and 

ground.

• The resistance should be 2 ohms or less.

Q: Is the measured resistance 2 ohms or less?

YES : Go to Step 7.
NO :  Go to Step 6.

STEP 6. Check the wiring harness between windshield 
wiper motor connector A-03 (terminal 5) and ground.

Q: Is the wiring harness between windshield wiper motor 

connector A-03 (terminal 5) and ground in good 
condition?
YES : No action is necessary and testing is complete.
NO :  The wiring harness may be damaged or the 

connector(s) may have loose, corroded or damaged 
terminals, or terminals pushed back in the connector. 
Repair the wiring harness as necessary. Verify the 
windshield wiper works normally.

STEP 7. Check front-ECU connector A-12X for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.

Q: Is front-ECU connector A-12X in good condition?

YES : Go to Step 8.
NO :  Repair or replace the damaged component(s). Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

. Verify that the windshield wiper works 

normally.

AC305206

A-03 (B)

HARNESS SIDE

CONNECTOR: A-03

AH

AC209364CV

CONNECTOR A-03
(HARNESS SIDE)

4

5

2

3

1

AC305206

A-03 (B)

HARNESS SIDE

CONNECTOR: A-03

AH

AC305977

CONNCTOR: A-12X

AI

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29

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31

RELAY BOX SIDE

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-273

STEP 8. Check the ignition switch (ACC) circuit to the 
front-ECU. Measure the voltage at front-ECU connector 
A-12X.

(1) Disconnect front-ECU connector A-12X and measure the 

resistance available at the relay box side of the connector.

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

(3) Measure the voltage between terminal 28 and ground.

• The voltage should measure approximately 12 volts 

(battery positive voltage).

Q: Is the measured voltage approximately 12 volts (battery 

positive voltage)?
YES : Replace the front-ECU. Verify that the windshield 

wiper works normally.

NO :  Go to Step 9.

STEP 9. Check the wiring harness between front-ECU 
connector A-12X (terminal 28) and the ignition switch 

(ACC).

AC305977

CONNCTOR: A-12X

AI

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28

29

30

31

RELAY BOX SIDE

AC209364CU

CONNECTOR A-12X
(RELAY BOX SIDE)

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29

30

31

28 27

25

26

21

23 22

AC305977

CONNCTOR: A-12X

AI

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22

23

24

25

26

27

28

29

30

31

RELAY BOX SIDE

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-274

NOTE: Also check intermediate connector C-29 for loose, cor-
roded, or damaged terminals, or terminals pushed back in the 
connector. If intermediate connector C-29 is damaged, repair or 
replace the damaged component(s) as described in GROUP 
00E, Harness Connector Inspection 

P.00E-2

.

Q: Is the wiring harness between front-ECU connector 

A-12X (terminal 28) and the ignition switch (ACC) in 
good condition?
YES : No action is necessary and testing is complete.
NO :  The wiring harness may be damaged or the 

connector(s) may have loose, corroded or damaged 
terminals, or terminals pushed back in the connector. 
Repair the wiring harness as necessary. Verify that 
the windshield wiper works normally.

AC305231AI

CONNECTOR: C-29