Mitsubishi Galant (2004+). Manual - part 269

 

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Mitsubishi Galant (2004+). Manual - part 269

 

 

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-267

INSPECTION PROCEDURE G-1: Windshield Wiper and Washer: The windshield wiper does not work 
at all.

NOTE: This troubleshooting procedure requires use 
of scan tool MB991958 and SWS monitor kit 
MB991813. For details on how to use the SWS mon-
itor, refer to "How to use SWS monitor 

P.54B-15

."

IGNITION
SWITCH (ACC)

WINDSHIELD
WIPER MOTOR

CIRCUIT
BREAKER

WIPER SPEED
SWITCHING
RELAY

RELAY
BOX

FRONT-ECU

Windshield Wiper Motor Circuit

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-268

.

CIRCUIT OPERATION

• The windshield wiper and washer switch sends a 

signal through the column-ECU (incorporated in 
the column switch) to the front-ECU. If the col-
umn-ECU sends a windshield wiper and washer 
switch "ON" signal to the front-ECU, the 
front-ECU turns on the relay (incorporated in the 
front-ECU), thus causing the windshield wiper 
and washer motor to be turned on.

• If the SWS communication line is defective, the 

front-ECU operates windshield wiper motor by 
using the other communication lines (wiper 
backup circuit) instead of that line. In this case, 
the windshield wiper works at low speed regard-
less of the windshield wiper and washer switch 
positions ("LO" or "HIGH").

.

TECHNICAL DESCRIPTION (COMMENT)
If the windshield wiper does not work at all, the wind-
shield wiper motor, column switch (windshield wiper 
and washer switch) or the front-ECU may be defec-
tive.

.

TROUBLESHOOTING HINTS

• Trouble in input signal system

• The wiring harness or connectors may have 

loose, corroded, or damaged terminals, or termi-
nals pushed back in the connector

• The wiper motor may be defective

• The column switch may be defective

• The front-ECU may be defective

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827: MUT-III USB Cable

• MB991910: MUT-III Main Harness A

• MB991813: SWS Monitor Kit

• MB991806: SWS Monitor Cartridge

• MB991812: SWS Monitor Harness (For Column-ECU)

• MB991822: Probe Harness

AC305206

A-03 (B)

CONNECTOR: A-03

AI

AC305977

CONNECTOR: A-12X

AF

AC305231

CONNECTOR: C-29

AH

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-269

STEP 1. 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 2.
"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-270

STEP 2. 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 wiper switch: INT

(1) Operate the MUT-III according to the procedure below to 

display "F.WIPER INT."
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 INT."

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

described in the table below.

Q: Are normal conditions displayed for "INT WIPER SW" 

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

Step 3.

Normal condition is not displayed for the "INT WIPER 
SW" : 
Replace the column switch. Verify that the windshield 

wiper works normally.

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

wiper works normally.

STEP 3. Check windshield wiper motor connector A-03 for 
loose, corroded or damaged terminals, or terminals 
pushed back in the connector.

Q: Is windshield wiper motor connector A-03 in good 

condition?
YES : 
Go to Step 4.
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.

ITEM NO.

ITEM NAME

NORMAL 
CONDITION

ITEM 05

INT WIPER 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

AC305206

A-03 (B)

HARNESS SIDE

CONNECTOR: A-03

AH

 

 

 

 

 

 

 

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