Mitsubishi Grandis. Manual — part 56

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-221

Step 5. Connector check: A-15X front-ECU
connector

Q: Is the check result normal?

YES :

Go to Step 6.

NO :

Repair the defective connector.

Step 6. Check the wiring harness between A-15X
front-ECU connector terminal No.27 and A-01
windshield wiper motor connector terminal No.1.

• Check the output lines for open circuit.

Q: Is the check result normal?

YES :

Go to Step 7.

NO :

Repair the wiring harness.

Step 7. Retest the system.

Check that the windshield wipers work normally by
moving the switch to each position.

Q: Is the check result normal?

YES :

The trouble can be an intermittent

malfunction (Refer to GROUP 00

− How to

Cope with Intermittent Malfunction

P.00-5

).

NO :

Replace the front-ECU.

AC311521AC

Connector: A-15X

Relay box side

21

22

23

24

25

26

27

28

29

30

31

AC311521AC

Connector: A-15X

Relay box side

21

22

23

24

25

26

27

28

29

30

31

AC310401

Connector: A-01 <LHD>

Harness side

AD

A-01 (GR)

AC310396

Connector: A-01 <RHD>

Harness side

AD

A-01 (GR)

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-222

Step 8. Connector check: A-15X front-ECU
connector

Q: Is the check result normal?

YES :

Go to Step 9.

NO :

Repair the defective connector.

Step 9. Check the wiring harness between A-15X
front-ECU connector terminal No.28 and A-01
windshield wiper motor connector terminal No.4.

• Check the output lines for open circuit.

Q: Is the check result normal?

YES :

Go to Step 10.

NO :

Repair the wiring harness.

Step 10. Retest the system.
Check that the windshield wipers work normally by
moving the switch to each position.

Q: Is the check result normal?

YES :

The trouble can be an intermittent

malfunction (Refer to GROUP 00

− How to

Cope with Intermittent Malfunction

P.00-5

).

NO :

Replace the front-ECU.

AC311521AC

Connector: A-15X

Relay box side

21

22

23

24

25

26

27

28

29

30

31

AC311521AC

Connector: A-15X

Relay box side

21

22

23

24

25

26

27

28

29

30

31

AC310401

Connector: A-01 <LHD>

Harness side

AD

A-01 (GR)

AC310396

Connector: A-01 <RHD>

Harness side

AD

A-01 (GR)

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-223

Inspection Procedure G-5: The intermittent wiper interval can not be adjusted by operating the
windshield intermittent wiper volume control.

CAUTION

Whenever the ECU is replaced, ensure that the
input and output signal circuits are normal.

COMMENTS ON TROUBLE SYMPTOM

The column switch or the front-ECU may be
defective.

POSSIBLE CAUSES

• Malfunction of the column switch

• Malfunction of the front-ECU

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

Step 1. Pulse check
Check the input signals below which are related to
the windshield intermittent wiper function.

OK: The MUT-III sounds or the voltmeter
needle fluctuates.

Q: Are the check result normal?

All the signals are received normally. :

Go to Step

2.

The ignition switch (IG1) signal is not received. :

Refer to inspection procedure Q-1 "The
ignition switch (ACC) signal is not received

P.54B-416

."

The windshield wiper volume signal is not
received. :

Refer to inspection procedure Q-8 "The

windshield wiper volume signal is not
received

P.54B-440

."

Step 2. Retest the system.
Check that the windshield intermittent wiper interval
can be adjusted by operating the windshield
intermittent wiper volume control.

OK: The intermittent wiper interval is
changed as the intermittent wiper volume is
rotated.

Q: Is the check result normal?

YES :

The trouble can be an intermittent

malfunction (Refer to GROUP 00

− How to

Cope with Intermittent Malfunction

P.00-5

).

NO :

Replace the front-ECU

WINDSHIELD WIPER
INTERMITTENT VOLUME

INPUT SIGNAL

ETACS-ECU

Windshield Wiper Intermittent Volume Input Signal

System switch

Check condition

Ignition switch (ACC)

When turned from LOCK
(OFF) position to the
ACC position

Windshield intermittent
wiper volume

When the windshield
intermittent wiper volume
is rotated from "FAST" to
"SLOW" (a pulse is sent
around the volume
middle position)

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-224

Inspection Procedure G-6: The intermittent wiper interval is not changed according to the vehicle
speed.

CAUTION

Whenever the ECU is replaced, ensure that the
input and output signal circuits are normal.

COMMENTS ON TROUBLE SYMPTOM

The ETACS-ECU calculates the intermittent wiper
interval according to the vehicle speed signal which
is sent by the engine-ECU.
If the intermittent wiper interval does not depend on
the vehicle speed, the input circuit of the vehicle
speed signal and the ETACS-ECU may be defective.

POSSIBLE CAUSES

• Malfunction of the vehicle speed signal

(engine-A/T-ECU <A/T> or engine-ECU <M/T>)

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

Step 1. Check the operation by operating the
intermittent wiper volume.
Check that the windshield intermittent wiper interval
can be adjusted by operating the windshield
intermittent wiper volume control.

Q: Is the check result normal?

YES :

Go to Step 2.

NO :

Refer to Inspection Procedure G-5 "The
intermittent wiper interval can not be
adjusted by operating the windshield
intermittent wiper volume control

P.54B-223

."

Step 2. Pulse check
Check the input signals below which are related to
the vehicle speed-dependent intermittent wiper.

OK: The MUT-III sounds or the voltmeter
needle fluctuates.

Q: Is the check result normal?

YES :

Go to Step 3.

NO :

Refer to inspection procedure Q-25 "The
vehicle speed signal is not received

P.54B-529

."

INPUT SIGNAL

INPUT SIGNAL

VEHICLE SPEED

COMBINATION
METER

VARIABLE INTERMITTENT WIPER
CONTROL SWITCH

ETACS-ECU

CAN COMMUNICATION LINE
(CAN_L LINE)

CAN COMMUNICATION LINE
(CAN_H LINE)

Variable Intermittent Wiper Control Circuit

System switch

Check condition

Vehicle speed signal

When the vehicle speed
has reached 10 km/h or
more.