Mitsubishi Grandis. Manual — part 54

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-213

Inspection Procedure G-2: The windshield wipers does not work when the wiper switch is at "INT",
"WASHER" or "MIST" position. However, the wipers work at low speed when the switch is at "LO" and
"HI" position.

CAUTION

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

COMMENTS ON TROUBLE SYMPTOM

The system may be at fail-safe mode as the SWS
communication line is defective. If the front-ECU
does not receive the ignition switch (ACC) signal due
to an open circuit in the SWS communication lines or
other reasons when the ignition switch is at the ACC
position, the system will enter the fail-safe mode.

POSSIBLE CAUSES

• Malfunction of the column switch

• 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?

Windshield Wiper Motor Drive Circuit

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

CIRCUIT
BREAKER

FRONT-ECU

INPUT SIGNAL

· WINDSHIELD WIPER HI SPEED SWITCH
· WINDSHIELD WIPER INTERMIT SWITCH
· WINDSHIELD WIPER LO SPEED SWITCH
· WINDSHIELD WIPER MIST SWITCH

WIPER SPEED
SWITCHING
RELAY

WINDSHIELD
WIPER MOTOR

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.

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-214

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. Retest the system.
The windshield wiper should now work normally.

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.

Inspection Procedure G-3: The windshield wipers do not stop at the specified park position

CAUTION

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

COMMENTS ON TROUBLE SYMPTOM

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

POSSIBLE CAUSES

• Malfunction of the windshield wiper motor

• Malfunction of the front-ECU

• Damaged harness wires and connectors

Windshield Wiper Automatic Stop Relay Circuit

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

FRONT-ECU

WINDSHIELD
WIPER MOTOR

WIPER
AUTOMATIC
STOP RELAY

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-215

DIAGNOSTIC PROCEDURE

Step 1. Connector check: A-01 windshield wiper
motor connector.

Q: Is the check result normal?

YES :

Go to Step 2.

NO :

Repair the connector.

Step 2. 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 3.

NO :

Replace the windshield wiper motor
assembly.

Step 3. Voltage measurement at the A-01
windshield wiper motor connector.

(1) Disconnect the connector, and measure at the

wiring harness side.

(2) Ignition switch: ACC

(3) Check the voltage between the A-01 windshield

wiper motor connector terminal No.3 and body
earth.

OK: System voltage

Q: Is the check result normal?

YES :

Go to Step 5.

NO :

Go to Step 4.

AC310401

Connector: A-01 <LHD>

Harness side

AD

A-01 (GR)

AC310396

Connector: A-01 <RHD>

Harness side

AD

A-01 (GR)

AC310401

Connector: A-01 <LHD>

Harness side

AD

A-01 (GR)

AC310396

Connector: A-01 <RHD>

Harness side

AD

A-01 (GR)

AC310507

Connector A-01
(Harness side)

BY

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-216

Step 4. Check the wiring harness between A-01
windshield wiper motor connector terminal No.3
and ignition switch (ACC).

NOTE:

AC310401

Connector: A-01 <LHD>

Harness side

AD

A-01 (GR)

AC310396

Connector: A-01 <RHD>

Harness side

AD

A-01 (GR)