Mitsubishi Galant (2004+). Manual - part 276

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-295

STEP 2. Use scan tool MB991958 to select "ECU COMM 
Check" on the SWS monitor display.

Check the following ECUs:

• Column-ECU

• Front-ECU

CAUTION

To prevent damage to scan tool MB991958, always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958. Connect 
special tool MB991910 before connecting special tool 
MB991812. Be sure to connect special tool MB991806 after 
turning on special tool MB991824.
(1) Connect the special tool. Refer to "How to connect SWS 

monitor 

P.54B-13

."

(2) Turn the ignition switch to the "ON" position.
(3) Operate scan tool MB991958 according to the procedure 

below to display "ECU COMM Check."
a. Select "Interactive Diagnosis."
b. Select "System select."
c. Select "SWS."
d. Select "SWS MONITOR."
e. Select "ECU COMM Check."

(4) Scan tool MB991958 should show "OK" on the "ECU 

COMM Check" menus for both the "COLUMN ECU" and 
the "FRONT ECU" menus.

Q: Is "OK" displayed for the "COLUMN ECU" and "FRONT 

ECU" menu?
"OK" is displayed for all the items : Go to Step 3.
"NG" is displayed for the "COLUMN ECU" menu : Refer 

to Inspection Procedure A-2 "Communication with the 
column switch (column-ECU) is not possible 

P.54B-72

."

"NG" is displayed for the "FRONT ECU" menu : Refer to 

Inspection procedure A-4 "Communication with the 
front-ECU is not possible 

P.54B-87

."

AC305411AB

MB991910

DATA LINK

CONNECTOR

MB991827

MB991824

MB991806

MB991812

AC302210

COLUMN SWITCH 
CONNECTOR

COLUMN SWITCH 
CONNECTOR AT 
HARNESS SIDE 

MB991812

AB

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-296

STEP 3. Check the input signal by using "FUNCTION 
DIAG." menu of the SWS monitor.

Check the input signals from the following switches:

• Ignition switch: ACC

• Windshield washer switch: ON

(1) Operate the scan tool MB991958 according to the 

procedure below to display "F.WIPER WASH."
a. Select "Interactive Diagnosis."
b. Select "System select."
c. Select "SWS."
d. Select "SWS MONITOR."
e. Select "Function Diag."
f. Select "WIPER."
g. Select "F.WIPER WASH."

(2) Check that normal conditions are displayed for the items 

described in the table below.

Q: Are normal conditions displayed for "FRONT 

WASH.SW" and "FRONT ECU ACK"?
Normal conditions displayed for all the items : Go to 

Step 4.

Normal condition is not displayed for the "FRONT 
WASH.SW" : Replace the column switch. Verify that the 

windshield washer works normally.

Normal condition is not displayed for the "FRONT ECU 
ACK" : Replace the front-ECU. Verify that the windshield 

washer works normally.

STEP 4. Check windshield washer motor connector A-29 
for loose, corroded or damaged terminals, or terminals 
pushed back in the connector.

Q: Is windshield washer motor connector A-29 in good 

condition?
YES : Go to Step 5.
NO :  Repair or replace the damaged component(s). Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

. Verify that the windshield washer works 

normally.

ITEM NO.

ITEM NAME

NORMAL 
CONDITION

ITEM 09

FRONT WASH.SW ON

ITEM 70

FRONT ECU ACK NORMAL ACK or 

HI-BEAM ACK

AC305411AB

MB991910

DATA LINK

CONNECTOR

MB991827

MB991824

MB991806

MB991812

AC302210

COLUMN SWITCH 
CONNECTOR

COLUMN SWITCH 
CONNECTOR AT 
HARNESS SIDE 

MB991812

AB

AC305206AK

CONNECTOR: A-29

HARNESS SIDE

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-297

STEP 5. Check the windshield washer motor.

(1) Disconnect windshield washer motor connector A-29, and 

check at windshield washer motor connector side.

(2) Fill the windshield washer tank with washer fluid.

(3) When battery voltage is applied between terminals 1 and 2, 

washer fluid should spray out.

Q: Does the windshield washer motor operate normally?

YES : Go to Step 6.
NO :  Replace the windshield washer motor. Verify that the 

windshield washer works normally.

AC305206AK

CONNECTOR: A-29

HARNESS SIDE

AC307196

2

1

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-298

STEP 6. Check the ground circuit to the windshield washer 
motor. Measure the resistance at the windshield washer 
motor connector A-29.

(1) Disconnect windshield washer motor connector A-29 and 

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

(2) Measure the resistance value between terminal 1 and 

ground.

• The resistance should be 2 ohms or less.

Q: Is the measured resistance 2 ohms or less?

YES : Go to Step 8.
NO :  Go to Step 7.

STEP 7. Check the wiring harness between windshield 
washer motor connector A-29 (terminal 1) and ground.

Q: Is the wiring harness between windshield washer motor 

connector A-29 (terminal 1) 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 that 
the windshield washer works normally.

STEP 8. 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 9.
NO :  Repair or replace the damaged component(s). Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

. Verify that the windshield washer works 

normally.

AC305206AK

CONNECTOR: A-29

HARNESS SIDE

AC209364GR

CONNECTOR A-29
(HARNESS SIDE)

AC305206AK

CONNECTOR: A-29

HARNESS SIDE

AC305977

CONNCTOR: A-12X

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