Mitsubishi 380. Manual — part 58

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-229

STEP 2. 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 wiper switch: INT

(1) Operate the MUT-III according to the procedure below to

display "F.WIPER INT."
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 INT."

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

described in the table below.

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

and "FRONT ECU ACK"?
Normal conditions displayed for all the items : Go to

Step 3.

Normal condition is not displayed for the "INT WIPER
SW" : Replace the column switch. Verify that the windshield

wiper works normally.

Normal condition is not displayed for the "FRONT ECU
ACK" : Replace the front-ECU. Verify that the windshield

wiper works normally.

STEP 3. 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 4.
NO : Repair or replace the damaged component(s). Refer

to GROUP 00E, Harness Connector Inspection

P.00E-2

. Verify that the windshield wiper works

normally.

ITEM NO.

ITEM NAME

NORMAL
CONDITION

ITEM 05

INT WIPER SW

ON

ITEM 70

FRONT ECU ACK

NORMAL ACK or
HI-BEAM ACK

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AC302210

COLUMN SWITCH
CONNECTOR

COLUMN SWITCH
CONNECTOR AT
HARNESS SIDE

MB991812

AB

16DB425A

A-03 (B)

CONNECTOR: A-03

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-230

STEP 4. 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 that the windshield wiper motor operates
normally at high and low speeds.

Q: Does the windshield wiper motor operate normally?

YES : Go to Step 5.
NO : Replace the windshield wiper motor. Verify that the

windshield wiper works normally.

16DB425A

A-03 (B)

CONNECTOR: A-03

16DB426A

HIGH SPEED

LOW SPEED

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-231

STEP 5. Check the ground circuit to the windshield wiper
motor. Measure the resistance at the windshield wiper
motor connector A-03.
(1) Disconnect windshield wiper motor connector A-03 and

measure the resistance available at the wiring harness side
of the connector.

(2) Measure the resistance value between terminal 1 and

ground.

• The resistance should be 2 ohms or less.

Q: Is the measured resistance 2 ohms or less?

YES : Go to Step 7.
NO : Go to Step 6.

STEP 6. Check the wiring harness between windshield
wiper motor connector A-03 (terminal 1) and ground.
Q: Is the wiring harness between windshield wiper motor

connector A-03 (terminal 1) and ground in good
condition?
YES : No action is necessary and testing is complete.
NO : The wiring harness may be damaged or the

connector(s) may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the wiring harness as necessary. Verify the
windshield wiper works normally.

STEP 7. Check front-ECU connector A-12X for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is front-ECU connector A-12X in good condition?

YES : Go to Step 8.
NO : Repair or replace the damaged component(s). Refer

to GROUP 00E, Harness Connector Inspection

P.00E-2

. Verify that the windshield wiper works

normally.

16DB425A

A-03 (B)

CONNECTOR: A-03

16DB427A

CONNECTOR A-03
(HARNESS SIDE)

16DB425A

A-03 (B)

CONNECTOR: A-03

AC305977

CONNCTOR: A-12X

AI

21

22

23

24

25

26

27

28

29

30

31

RELAY BOX SIDE

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-232

STEP 8. Check the ignition switch (ACC) circuit to the
front-ECU. Measure the voltage at front-ECU connector
A-12X.
(1) Disconnect front-ECU connector A-12X and measure the

resistance available at the relay box side of the connector.

(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between terminal 28 and ground.

• The voltage should measure approximately 12 volts

(battery positive voltage).

Q: Is the measured voltage approximately 12 volts (battery

positive voltage)?
YES : Replace the front-ECU. Verify that the windshield

wiper works normally.

NO : Go to Step 9.

STEP 9. Check the wiring harness between front-ECU
connector A-12X (terminal 28) and the ignition switch
(ACC).

AC305977

CONNCTOR: A-12X

AI

21

22

23

24

25

26

27

28

29

30

31

RELAY BOX SIDE

AC209364CU

CONNECTOR A-12X
(RELAY BOX SIDE)

24

29

30

31

28 27

25

26

21

23 22

AC305977

CONNCTOR: A-12X

AI

21

22

23

24

25

26

27

28

29

30

31

RELAY BOX SIDE