Mitsubishi Galant. Manual — part 672

SWS DIAGNOSIS

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-83

TROUBLESHOOTING HINTS

•

Malfunction of the wiper motor

•

Malfunction of the column switch (windshield
wiper and washer switch)

•

Malfunction of the front-ECU

•

Damaged harness wires and connectors

DIAGNOSIS

Required Special Tools:

•

MB991223: Test Harness Set

•

MB991502: Scan Tool (MUT-II)

•

MB991529: Diagnostic Trouble Code Check Harness

STEP 1. Check method of the input signal

Q: Which is to be used, the scan tool or the voltmeter to

check the input signal?
Scan tool MB991502 : Go to Step 2.
Voltmeter : Go to Step 3.

STEP 2. Check the input signal (by using scan tool
MB991502).
Check the input signals from the windshield wiper switches.

CAUTION

To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991502.
(1)Connect scan tool MB991502 to the data link connector.
(2)Check that the tone alarm of scan tool MB991502 sounds

when the input signal enters.

Q: Does the tone alarm of scan tool MB991502 sounds

when the input signal enters?
YES : Go to Step 4.
NO : Check the windshield wiper switch input circuit. Refer

to Inspection Procedure N-15 (

P.54B-260

).

STEP 3. Check the input signal (by using a voltmeter).
Check the input signals from the windshield wiper switches.
(1)Use special tool MB991529 to connect a voltmeter between

ground terminal 4 or 5 and ETACS-ECU terminal 9 of the
data link connector.

(2)Check that the voltmeter indicator deflects once when the

input signal enters.

Q: Does the voltmeter indicator deflect?

YES : Go to Step 4.
NO : Check the windshield wiper switch input circuit. Refer

to Inspection Procedure N-15

P.54B-260

).

AC003081 AB

16 PIN

MB991502

AC003083

16 PIN

AB

ETACS-ECU
TERMINAL

GROUNDED TERMINAL

MB991529

SWS DIAGNOSIS

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-84

STPE 4. Check the windshield wiper motor.
(1)Disconnect the wiper motor connector A-02.
(2)Connect a battery to the wiper motor as shown in the

illustration and check motor operation at low-speed and
high-speed.

Q: Is the wiper motor in good condition?

YES : Go to Step 5.
NO : Replace the wiper motor. The windshield wiper should

work normally.

STEP 5. Check the wiper motor ground circuit at wiper
motor connector A-02.
(1)Disconnect wiper motor connector A-02 and measure at the

harness side.

(2)Measure the resistance between terminal 5 and ground.

Q: Is the resistance less than 2 ohm?

YES : Go to Step 8.
NO : Go to Step 6.

STEP 6. Check wiper motor connector A-02 for damage.
Q: Is wiper motor connector A-02 in good condition?

YES : Go to Step 7.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. The windshield wiper

should work normally.

AC003130 AB

LOW-SPEED

HI-SPEED

CONNECTOR A-02

AC003165

CONNECTOR A-02
(HARNESS SIDE)

AB

AC03164 AB

CONNECTOR: A-02

SWS DIAGNOSIS

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-85

STEP 7. Check the harness wire between wiper motor
connector A-02 and ground.
Q: Is the harness wire between wiper motor connector A-

02 and ground in good condition?
YES : There is no action to be taken.
NO : Repair it. The windshield wiper should work normally.

STEP 8. Check the front-ECU power supply circuit [ignition
switch (ACC)] at the front-ECU connector A-09X.
(1)Disconnect the front-ECU connector A-09X and measure at

the relay box side.

(2)Turn the ignition switch to "ACC" position.
(3)Measure the voltage between terminal 9 and ground.

Q: Is the voltage approximately 12 volts (battery positive

voltage)?
YES : Replace the front-ECU. The windshield wiper should

work normally.

NO : Go to Step 9.

STEP 9. Check front-ECU connector A-09X for damage.
Q: Is front-ECU connector A-09X in good condition?

YES : Go to Step 10.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. The windshield wiper

should work normally.

AC03164 AB

CONNECTOR: A-02

17 16 15 14 13

12 11 10 9 8 7 6 5 4

3 2 1

AC002116

CONNECTOR A-09X
(RELAY BOX SIDE)

AB

ACX02500 AD

BATTERY

CONNECTOR: A-09X

SWS DIAGNOSIS

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-86

STEP 10. Check the harness wires between front-ECU
connector A-09X and ignition switch (ACC).
NOTE: After checking intermediate connector C-66 and
junction block connectors C-73 and C-77, check the wires. If
intermediated connector C-66 and junction block connectors C-
73 and C-77 are damaged, repair or replace them. Refer to
GROUP 00E, Harness Connector Inspection

P.00E-2

.

Q: Are the harness wires between front-ECU connector A-

09X and ignition switch (ACC) in good condition?
YES : There is no action to be taken.
NO : Repair them. The windshield wiper should work

normally.

Inspection Procedure F-2: Windshield wiper and washer: Any of the windshield wiper switch
positions is defective.

ANY OF THE WINDSHIELD WIPER SWITCH POSITIONS IS DEFECTIVE.

•

Refer to Inspection Procedure F-1 (

P.54B-82

).

CIRCUIT OPERATION
A signal from the windshield wiper switch is sent
through the column-ECU inside the column switch to
the front-ECU. The signal turns on the relay inside
the front-ECU to operate the wiper motor.

TECHNICAL DESCRIPTION (COMMENT)
The wiper motor, column switch (windshield wiper
and washer switch) or the front-ECU may be
defective.

TROUBLESHOOTING HINTS

•

Malfunction of the wiper motor

•

Malfunction of the column switch (windshield
wiper and washer switch)

•

Malfunction of the front-ECU

•

Damaged harness wires and connectors

ACX02500 AD

BATTERY

CONNECTOR: A-09X

AC003079 AB

CONNECTOR
BLOCK (LH)

CONNECTOR: C-66

AC003082AK

CONNECTORS: C-73, C-77

C-73

JUNCTION BLOCK
(FRONT VIEW)

C-77