Mitsubishi Galant (2004+). Manual - part 275

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-291

STEP 1. Using scan tool MB991958, diagnose the CAN bus 
line.

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.
(1) Connect scan tool MB991958.Refer to "How to connect 

SWS monitor 

P.54B-13

."

(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the CAN bus line found to be normal?

YES : Go to Step 2.
NO :  Repair the CAN bus line (Refer to GROUP 54C, 

Diagnosis 

P.54C-14

).

STEP 2. Using scan tool MB991958, read the diagnostic 
trouble code related to the combination meter.

Check whether the combination meter-related DTC is set.
(1) Turn the ignition switch to the "ON" position.
(2) Check whether the combination meter-related DTC is set.

(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?

YES : Diagnose the combination meter. Refer to 

P.54A-56

.

NO :  Go to Step 3.

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-292

STEP 3. Check the input signal by using "DATA LIST" 
menu of the SWS monitor.

Check the input signals from the following switches:

• Ignition switch: ACC

• Windshield wiper switch: INT

• Intermittent wiper control: slow side

CAUTION

Connect special tool MB991910 before connecting special 
tool MB991812. Be sure to connect special tool MB991806 
after turning on special tool MB991824.
(1) Operate the scan tool MB991958 according to the 

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

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

described in the table below.
NOTE: Also check that the wiper interval changes smoothly 
when the vehicle is accelerated from 0 km/h (0 mph) to 60 
km/h (37.5 mph).

Q: Does the value change within the normal range when 

the variable intermittent wiper control switch is rotated?
YES : Replace the front-ECU. The windshield intermittent 

wiper interval should change according to the vehicle 
speed.

NO :  Replace the ETACS-ECU. The windshield intermittent 

wiper interval should change according to the vehicle 
speed.

ITEM NO.

ITEM NAME

NORMAL 
CONDITION

ITEM 37

INT WIPER TIME

14.0 

− 19.0 s

AC305411AB

MB991910

DATA LINK

CONNECTOR

MB991827

MB991824

MB991806

MB991812

AC302210

COLUMN SWITCH 
CONNECTOR

COLUMN SWITCH 
CONNECTOR AT 
HARNESS SIDE 

MB991812

AB

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-293

INSPECTION PROCEDURE G-7: Windshield Wiper and Washer: The windshield washer does not 
work.

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

."

RELAY
BOX

IGNITION
SWITCH (ACC)

WINDSHIELD
WASHER MOTOR

FRONT-ECU

WINDSHIELD WASHER
 

WASHER
RELAY

INPUT SIGNAL

Windshield Washer Motor Circuit

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-294

.

CIRCUIT OPERATION
The windshield washer switch sends a signal 
through the column-ECU (incorporated in the column 
switch) to the front-ECU. If the column-ECU sends a 
windshield washer switch "ON" signal to the 
front-ECU, the front-ECU turns on the relay (incorpo-
rated in the front-ECU), thus causing the windshield 
washer motor to be turned on.

.

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

.

TROUBLESHOOTING HINTS

• The wiring harness or connectors may have 

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

• The windshield washer 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

STEP 1. Verify the windshield wiper operation.
Q: Does the windshield wiper operate normally?

YES : Go to Step 2.
NO :  Refer to Inspection Procedure G-1 "The windshield 

wiper do not work at all 

P.54B-267

."

AC305977

CONNECTOR: A-12X

AF

AC305206AJ

CONNECTOR: A-29