Mitsubishi Grandis. Manual - part 62

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-245

HEADLAMP WASHER

Inspection Procedure I-1: The headlamp washer does not work.

CAUTION

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

COMMENTS ON TROUBLE SYMPTOM

The headlamp washer motor, the column switch or 
the front-ECU may be defective.

POSSIBLE CAUSES

• Malfunction of the headlamp washer motor

• Malfunction of the column switch

• Malfunction of the front-ECU

• Damaged harness wires and connectors

DIAGNOSIS 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.

FRONT-ECU

HEADLAMP
WASHER MOTOR

INPUT SIGNAL

HEADLAMP WASHER

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

FUSIBLE
LINK

5

HEADLAMP
WASHER

Headlamp Washer Motor Circuit

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-246

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

."

Headlamp washer switch signal is not received. : 

Refer to inspection procedure Q-6 "The 
column switch (headlamp washer switch) 
signal is not received 

P.54B-438

."

Step 3. Connector check: A-31 headlamp washer 
motor connector

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Repair the connector.

Step 4. Check the headlamp washer motor 
assembly.
Refer to GROUP 51 

− Headlamp washer 

P.51-35

.

Q: Is the check result normal?

YES : 

Go to Step 5

NO : 

Replace the headlamp washer motor.

Step 5. Resistance measurement at the A-31 
headlamp washer motor connector.

(1) Disconnect the connector, and measure at the 

wiring harness side.

(2) Continuity between A-31 headlamp washer 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.

System switch

Check condition

Ignition switch (ACC)

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

Headlamp washer switch When the switch is 

turned from off to on.

AC310401

Connector : A-31 <LHD>

AH

A-31(GR)

Harness side

AC310396

Connector : A-31 <RHD>

AH

A-31(GR)

Harness side

AC310401

Connector : A-31 <LHD>

AH

A-31(GR)

Harness side

AC310396

Connector : A-31 <RHD>

AH

A-31(GR)

Harness side

AC310506

AC310506

Connector A-31
(Harness side)

BP

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-247

Step 6. Connector check: A-40 earth connector

Q: Is the check result normal?

YES : 

Go to Step 7.

NO : 

Repair the connector.

Step 7. Check the wiring harness between A-31 
headlamp washer motor connector terminal No.2 
and A-40 earth connector terminal No.2.

• 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.

AC310401

Connector: A-40 <LHD>

Harness side

AE

A-40 (GR)

AC310396

Connector: A-40 <RHD>

Harness side

AE

A-40 (GR)

AC310401

Connector : A-31 <LHD>

AH

A-31(GR)

Harness side

AC310396

Connector : A-31 <RHD>

AH

A-31(GR)

Harness side

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-248

Step 8. Connector check: A-14X 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-14X 
front-ECU connector.

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

junction block side.

(2) Ignition switch: ACC

(3) Check the voltage between the A-14X front-ECU 

connector terminal No.9 and body earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 11.

NO : 

Go to Step 10.

Step 10. Check the wiring harness between 
A-14X front-ECU connector terminal No.9 and the 
fusible link (5).

• Check the power supply line 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.

AC311521AB

Connector: A-14X

Relay box side

AC311521AB

Connector: A-14X

Relay box side

AC310507CB

Connector A-14X 
(Harness side)

AC311521AB

Connector: A-14X

Relay box side