Mitsubishi Grandis. Manual - part 189

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-218

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.

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.

AC310401

Connector: A-01 <LHD>

Harness side

AD

A-01 (GR)

AC310396

Connector: A-01 <RHD>

Harness side

AD

A-01 (GR)

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

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-219

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.

AC310401

Connector: A-01 <LHD>

Harness side

AD

A-01 (GR)

AC310396

Connector: A-01 <RHD>

Harness side

AD

A-01 (GR)

AC311521AC

Connector: A-15X

Relay box side

21

22

23

24

25

26

27

28

29

30

31

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-220

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. SWS monitor data list

• Rotate the windshield intermittent wiper volume 

when the vehicle is stopped.

NOTE: Also check that the windshield wiper interval 

changes smoothly when the windshield 
intermittent wiper interval adjusting knob is 
rotated from "SLOW" to "FAST" positions.

OK: Normal condition is displayed.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Refer to Inspection Procedure Q-8 "The 
intermittent wiper volume signal is not 
received 

P.54C-481

."

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

Item No.

Item name

Normal condition

Item 37

INT WIPER TIME

4.6 

− 32.0 s

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-221

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 <M/T> or engine-A/T-ECU 
<A/T>.
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 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.54C-220

."

Step 2. Check the SWS monitor customized 
function.

Use the SWS monitor customize function to confirm 
that "SPEED SEN WIP" is set to "W.FUNCTION".

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Use the SWS monitor customize function to 
set the "SPEED SEN WIP" to 
"W.FUNCTION" (Refer to 

P.54C-574

).

Step 3. ECU check by using the SWS monitor.

Check that the power supply and earth lines to the 
ETACS-ECU and the SWS communication lines are 
normal.

• Ignition switch: ON

ECU TO BE CHECKED

• ETACS ECU

OK: "OK" is displayed on the "ETACS-ECU" 
menu.

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Refer to Inspection Procedure A-3 
"Communication with the ETACS-ECU is 
not possible 

P.54C-63

."

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