Mitsubishi Lancer Evolution IX. Manual - part 221

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-143

COMMENTS ON TROUBLE SYMPTOM

The windshield wiper motor, the column switch or the 
front-ECU may be defective. If a problem is found in 
the ECU check by using the SWS monitor, also 
check the wiper backup circuit (between C-203 col-
umn switch connector terminal No.8 and A-11X 
front-ECU connector terminal No.26) and repair if 
necessary.

POSSIBLE CAUSES

• Malfunction of the windshield wiper motor

• Malfunction of the column switch

• Malfunction of the front-ECU

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

Step 1. ECU check on the SWS monitor
Check that the power supply and earth lines to the 
column switch (column-ECU) and the front-ECU and 
the SWS communication lines are normal.

• Turn the ignition switch to the ON position.

ECUS TO BE CHECKED

• COLUMN ECU

• FRONT ECU

OK: "OK" is displayed for all the items

Q: Is the check result normal?

"OK" is displayed for all the items : 

Go to Step 2.

"NG" is displayed on the "COLUMN ECU" menu. : 

Refer to Inspection Procedure A-2 
"Communication with the column switch 
(column-ECU) is not possible 

P.54C-30

."

"NG" is displayed on the "FRONT ECU" menu. : 

Refer to Inspection Procedure A-4 
"Communication with the front-ECU is not 
possible 

P.54C-42

."

Step 2. Function diagnosis by using the SWS 
monitor
Check the SWS communication signal, which are 
related to the windshield wiper function.

<Selected item> F.WIPER INT

• Turn the ignition switch to the ACC position.

• Windshield wiper switch: INT

OK: Normal conditions are displayed for all 
the items.

Q: Is the check result normal?

Normal conditions displayed for all the items : 

Go 

to Step 3.

Normal condition is not displayed for item No.05 : 

Replace the column switch.

Normal condition is not displayed for item No.31 : 

Refer to Inspection Procedure L-1 "The 
ignition switch (ACC) signal is not received 

P.54C-258

."

Normal condition is not displayed for item No.70 : 

Replace the front-ECU.

Item No. Item name

Normal condition

Item 05

INT WIPER SW

ON

Item 31

IGNITION SW 
ACC

ON

Item 70

FRONT ECU ACK NORMAL ACK or 

HI-BEAM ACK

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-144

Step 3. Connector check: B-01 windshield wiper 
motor connector

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Repair the connector.

Step 4. Check the windshield wiper motor 
assembly.
Refer to GROUP 51 

− Windshield wiper 

P.51-21

.

Q: Is the check result normal?

YES : 

Go to Step 5

NO : 

Replace the windshield wiper motor 
assembly.

Step 5. Resistance measurement at the B-01 
windshield wiper motor connector

(1) Disconnect the connector, and measure at the 

wiring harness side.

(2) Continuity between B-01 windshield wiper motor 

connector terminal No.5 and body earth

OK: 2

Ω or less

Q: Is the check result normal?

YES : 

Go to Step 7.

NO : 

Go to Step 6.

AC310437

Connector: B-01 <LHD>

AB

Harness side

B-01 (GR)

AC310477

Connector: B-01 <RHD>

AD

Harness side

B-01 (GR)

AC310437

Connector: B-01 <LHD>

AB

Harness side

B-01 (GR)

AC310477

Connector: B-01 <RHD>

AD

Harness side

B-01 (GR)

4

1

2

5

3

AC301635

Connector B-01
(Harness side)

AC

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-145

Step 6. Check the wiring harness between B-01 
windshield wiper motor connector terminal No.5 
and body earth.

• Check the earth wires for open circuit.

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 : 

Repair the wiring harness.

Step 7. Connector check: A-11X front-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 8.

NO : 

Repair the connector.

Step 8. Voltage measurement at the A-11X 
front-ECU connector

(1) Remove the front-ECU, and measure at the relay 

box side.

(2) Ignition switch: ACC

(3) Check the voltage between the A-11X front-ECU 

connector terminal No.24 and body earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 10.

NO : 

Go to Step 9.

AC310437

Connector: B-01 <LHD>

AB

Harness side

B-01 (GR)

AC310477

Connector: B-01 <RHD>

AD

Harness side

B-01 (GR)

AC310572AC

Connector: A-11X

Relay box side

Battery

29

31 30

28 27

25

26

24

21

22

23

AC310572AC

Connector: A-11X

Relay box side

Battery

29

31 30

28 27

25

26

24

21

22

23

24

29

30

31

2827

25

26

21

2322

AC304768

Connector A-11X
(Relay box side)

AB

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-146

Step 9. Check the wiring harness between A-11X 
front-ECU connector terminal No.24 and the 
ignition switch (ACC).

NOTE: 

Prior to the wiring harness inspection, check the 
junction block connectors C-210, C-211 and interme-
diate connector C-129 and repair if necessary.

• Check the power supply line to the ignition switch 

(ACC) for open circuit.

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 : 

Repair the wiring harness.

AC310572AC

Connector: A-11X

Relay box side

Battery

29

31 30

28 27

25

26

24

21

22

23

AC310449

Connectors: C-210, C-211 <LHD>

AF

C-210

C-211

Junction block (front view)

C-210

Harness side

10

1

6

14

5

12

13

4

11

7

2

3

8

9

C-211

Harness side

4

6 5

3

2

1

AC310459

Connectors: C-210, C-211 <RHD>

AF

C-210

C-211

Junction block (front view)

C-210

Harness side

10

1

6

14

5

12

13

4

11

7

2

3

8

9

C-211

Harness side

4

6 5

3

2

1

AC310446

Connector: C-129 <LHD>

AS

AC310454

Connector: C-129 <RHD>

AV