Mitsubishi Galant. Manual — part 673

SWS DIAGNOSIS

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-87

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 sound 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-88

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 when the windshield wiper switch is set
to all positions.

STEP 5. Check the wiper motor connector A-02 and front-
ECU connector A-09X for damage.
Q: Are wiper motor connector A-02 and front-ECU

connector A-09X in good condition?
YES : Go to Step 6.
NO : Repair or replace them. Refer to GROUP 00E,

Harness Connector Inspection

P.00E-2

. The

windshield wiper should work normally when the
windshield wiper switch is set to all positions.

AC003130 AB

LOW-SPEED

HI-SPEED

CONNECTOR A-02

AC03164 AB

CONNECTOR: A-02

ACX02500 AD

BATTERY

CONNECTOR: A-09X

SWS DIAGNOSIS

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-89

STEP 6. Check the harness wires between wiper motor
connector A-02 and front-ECU connector A-09X.
NOTE: After checking intermediate connector C-05, check the
wires. If intermediate connector C-05 is damaged, repair or
replace it. Refer to GROUP 00E, Harness Connector
Inspection

P.00E-2

.

Q: Are the harness wires between wiper motor connector

A-02 and front-ECU connector A-09X in good condition?
YES : There is no action to be taken.
NO : Repair them. The windshield wiper should work

normally when the windshield wiper switch is set to all
positions.

Inspection Procedure F-3: Windshield wiper and washer: Windshield wiper does not stop at the
predetermined park position.

WINDSHIELD WIPER Motor Driver Circuit.

•

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 or the front-ECU may be defective.

TROUBLESHOOTING HINTS

•

Malfunction of the wiper motor

•

Malfunction of the front-ECU

•

Damaged harness wires and connectors

AC03164 AB

CONNECTOR: A-02

ACX02500 AD

BATTERY

CONNECTOR: A-09X

AC003089 AB

CONNECTOR: C-23

SWS DIAGNOSIS

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-90

DIAGNOSIS

Required Special Tool:

•

MB991223: Test Harness Set

STEP 1. Check the windshield wiper motor
(1)Disconnect the wiper motor connector A-02.
(2)Run the wiper motor at low-speed, disconnect the battery,

and stop the motor.

(3)Reconnect the battery as shown in the illustration, and

confirm that after the motor starts turning at low-speed, and
stops at the automatic stop position.

Q: Is the wiper motor in good condition?

YES : Go to Step 2.
NO : Replace the wiper motor. The windshield wiper should

stop at the predetermined park position.

STEP 2. Check the wiper motor power supply circuit at the
wiper motor connector A-02 by backprobing.
(1)Do not disconnect the wiper motor connector A-02.
(2)Turn the ignition switch to "ACC" position.
(3)Measure the voltage between terminal 2 and ground by

backprobing.

Q: Is the voltage approximately 12 volts (battery positive

voltage)?
YES : Go to Step 5.
NO : Go to Step 3.

AC003166

LOW-SPEED

HI-SPEED

AB

CONNECTOR A-02

AC003167

CONNECTOR A-02
(HARNESS SIDE)

AB