Mitsubishi Grandis. Manual - part 52

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-205

WINDSHIELD WIPER AND WASHER

Inspection Procedure G-1: The windshield wipers does not work at all.

CAUTION

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

COMMENTS ON TROUBLE SYMPTOM

The windshield wiper motor, the column switch or the 
front-ECU may be defective.

POSSIBLE CAUSES

• Malfunction of the windshield wiper motor

• Malfunction of the column switch

Windshield Wiper Power Supply Circuit

FRONT-ECU

WINDSHIELD 
WIPER MOTOR

WIPER SPEED 
SWITCHING 
RELAY

CIRCUIT
BREAKER

IGNITION 
SWITCH (ACC)

Wire colour code
B : Black     LG : Light green     G : Green     L : Blue     W : White     Y : Yellow     SB : Sky blue
BR : Brown     O : Orange     GR : Gray     R : Red     P : Pink     V : Violet   

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-206

• Malfunction of the front-ECU

• Damaged harness wires and connectors

DIAGNOSTIC PROCEDURE

Step 1. MUT-III diagnosis code
When the ignition switch is turned to the LOCK 
(OFF) position, check that the ETACS-ECU does not 
set the diagnosis code.

Q: Is the diagnosis code set?

YES : 

Refer to diagnosis code chart 

P.54B-29

.

NO : 

Go to Step 2.

Step 2. Pulse check.
Check the input signals below which are related to 
the windshield wiper.

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 

3.

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

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

P.54B-416

."

Windshield mist wiper switch signal is not 
received. : 

Refer to inspection procedure Q-7 "The 

column switch (windshield wiper washer 
and rear wiper washer switch) signal is not 
received 

P.54B-439

."

Step 3. Connector check: A-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.51-25

.

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Replace the windshield wiper motor 
assembly.

System switch

Check condition

Ignition switch (ACC)

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

Windshield mist wiper 
switch

When the switch is 
turned from off to on.

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-207

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

(1) Disconnect the connector, and measure at the 

wiring harness side.

(2) Continuity between A-01 windshield wiper motor 

connector terminal No.2 and body earth

OK: 2 

Ω or less

Q: Is the check result normal?

YES : 

Go to Step 8.

NO : 

Go to Step 6.

Step 6. Connector check: A-40 earth connector

Q: Is the check result normal?

YES : 

Go to Step 7.

NO : 

Repair the connector.

AC310401

Connector: A-01 <LHD>

Harness side

AD

A-01 (GR)

AC310396

Connector: A-01 <RHD>

Harness side

AD

A-01 (GR)

AC310506

4

1

2

5

3

Connector A-01 
(Harness side)

BN

AC310401

Connector: A-40 <LHD>

Harness side

AE

A-40 (GR)

AC310396

Connector: A-40 <RHD>

Harness side

AE

A-40 (GR)

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-208

Step 7. Check the wiring harness between A-01 
windshield wiper motor connector terminal No.2 
and A-40 earth connector terminal No.5.

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

Q: Is the check result normal?

YES : 

Go to Step 9.

NO : 

Repair the connector.

Step 9. Voltage measurement at the A-15X 
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-15X front-ECU 

connector terminal No.24 and body earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 11.

NO : 

Go to Step 10.

AC310402

AC

Connectors: A-01, A-40

A-01 (GR)

A-01

Harness side

A-40 (GR)

A-40

Harness side

<LHD>

AC310397

AC

Connectors: A-01, A-40

A-01 (GR)

A-01

Harness side

A-40 (GR)

A-40

Harness side

<RHD>

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

AC310507

Connector A-15X
(Relay box side)

BX

21

22

23

24

25

26

27

28

29

30

31