Mitsubishi Galant 9G. Manual — part 72

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-284

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

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-285

.

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-259

."

AC305977

CONNECTOR: A-12X

AF

AC305206AJ

CONNECTOR: A-29

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-286

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-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

."

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-287

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