Mitsubishi Galant 9G. Manual — part 68

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-268

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 : Replace the

front-ECU. Verify that the windshield wiper works
normally.

"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-71

."

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

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

P.54B-86

."

INSPECTION PROCEDURE G-3: Windshield Wiper and Washer: All of the windshield wiper switch
positions are defective.

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

."

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-269

.

TECHNICAL DESCRIPTION (COMMENT)

If either of the windshield wiper switch positions is
defective, the windshield wiper motor, column switch
(windshield wiper and washer switch) or the
front-ECU may be defective.

.

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 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

WINDSHIELD
WIPER MOTOR

CIRCUIT
BREAKER

FRONT-ECU

· WINDSHIELD WIPER HI SPEED SWITCH
· WINDSHIELD WIPER INTERMIT SWITCH
· WINDSHIELD WIPER LO SPEED SWITCH
· WINDSHIELD WIPER MIST SWITCH

WIPER SPEED
SWITCHING
RELAY

INPUT SIGNAL

Windshield Wiper Motor Circuit

AC305206

A-03 (B)

CONNECTOR: A-03

AI

AC305977

CONNECTOR: A-12X

AF

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-270

STEP 1. Check the input signal by using "DATA LIST"
menu of the SWS monitor.
Turn the ignition switch to the ACC position before checking
input signals from the windshield wiper switch.

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) Operate scan tool MB991958 according to the procedure

below to display "COLUMN ECU."
a. Select "Interactive Diagnosis."
b. Select "System select."
c. Select "SWS."
d. Select "SWS MONITOR."
e. Select "Data List."
f. Select "COLUMN ECU."

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

described in the table below.

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

"LO WIPER SW", "HI WIPER SW" and "MIST WIPER
SW"?
YES : Go to Step 2.
NO : Refer to Inspection Procedure M-6 "ETACS-ECU

does not receive any signal from the windshield mist
wiper switch

P.54B-488

."

ITEM NO.

ITEM NAME

NORMAL
CONDITION

ITEM 05

INT WIPER SW

ON

ITEM 06

LO WIPER SW

ON

ITEM 07

HI WIPER SW

ON

ITEM 08

MIST WIPER SW

ON

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-271

STEP 2. 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 3.
NO : Repair or replace the damaged component(s). Refer

to GROUP 00E, Harness Connector Inspection

P.00E-2

. Verify that the windshield wiper operates

normally when the windshield wiper switch is moved
to each position.

STEP 3. 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 the windshield wiper motor operates normally
at high and low speeds.

Q: Does the windshield wiper motor operate normally?

YES : Go to Step 4.
NO : Replace the windshield wiper motor. Verify that the

windshield wiper operates normally when the
windshield wiper switch is moved to each position.

AC305206

A-03 (B)

HARNESS SIDE

CONNECTOR: A-03

AH

AC305206

A-03 (B)

HARNESS SIDE

CONNECTOR: A-03

AH

AC306750

1

2

3

4

5

1

2

3

4

5

1

2

3

4

5

CHECK OPERATION

LOW SPEED

HIGH SPEED

AB