Mitsubishi Colt Ralliart. Manual - part 337

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-92

COMMENTS ON TROUBLE SYMPTOM

The windshield wiper motor, the column switch or the 
ETACS-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 B-135 col-
umn switch connector terminal No.8 and B-133 
ETACS-ECU connector terminal No.64) and repair if 
necessary.

POSSIBLE CAUSES

• Malfunction of the windshield wiper motor

• Malfunction of the column switch (column-ECU)

• Malfunction of the ETACS ECU

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

Step 1. M.U.T.-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-18

.

NO : 

Go to Step 2.

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

OK: The M.U.T.-III sounds or the voltmeter 
needle fluctuates. 

Q: Are the check results normal?

All the signals are received normally : 

Go to Step 

3.

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

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

P.54B-200

."

Windshield mist wiper switch signal is not 
received. : 

Refer to Inspection Procedure N-5 

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

P.54B-207

."

Step 3. Connector check: A-04 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.51-31

.

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.

AC313860

Connector: A-04

Harness side

AB

A-04 (GR)

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SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-93

Step 5. Resistance measurement at the A-04 
windshield wiper motor connector.

(1) Disconnect the connector, and measure at the 

wiring harness side.

(2) Continuity between A-04 windshield wiper motor 

connector terminal No.5, and body earth

OK: Continuity exists (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-31 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-04 
windshield wiper motor connector terminal No.5 
to A-31 earth connector terminal No.4.

• 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 

use Troubleshooting/inspection Service 
Points 

− How to Cope with Intermittent 

Malfunction 

P.00-13

).

NO : 

Repair the wiring harness.

Step 8. Connector check: B-134 ETACS-ECU 
connector.

Q: Is the check result normal?

YES : 

Go to Step 9.

NO : 

Repair the connector.

AC313860

Connector: A-04

Harness side

AB

A-04 (GR)

AC313972

Connector A-04 
(Harness side)

AK

AC313862

A-31 (GR)

AB

Connector: A-31 

AC313860

Connector: A-04

Harness side

AB

A-04 (GR)

AC313862

A-31 (GR)

AB

Connector: A-31 

AC313872 AH

Connector: B-134

Harness side

Junction block (Rear view)

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SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-94

Step 9. Voltage measurement at the B-134 
ETACS-ECU connector.

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

relay box side.

(2) Ignition switch: ACC

(3) Check the voltage between the B-134 

ETACS-ECU connector terminal No.10 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 B-134 
ETACS-ECU connector terminal No.10 to the 
ignition switch (ACC).

NOTE: 

Prior to the wiring harness inspection, check the 
junction block connectors B-129 and repair if neces-
sary.

• 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 

use Troubleshooting/inspection Service 
Points 

− How to Cope with Intermittent 

Malfunction 

P.00-13

).

NO : 

Repair the wiring harness.

Step 11. Retest the system.
The windshield wiper should now work normally at 
all.

Q: Is the check result normal?

YES : 

The trouble can be an intermittent 

malfunction (Refer to GROUP 00 

− How to 

use Troubleshooting/inspection Service 
Points 

− How to Cope with Intermittent 

Malfunction 

P.00-13

).

NO : 

Replace the ETACS-ECU.

AC313872 AH

Connector: B-134

Harness side

Junction block (Rear view)

AC313972

Connector B-134
 (Harness side)

AL

AC313872 AH

Connector: B-134

Harness side

Junction block (Rear view)

AC313872BC

Connector: B-129

Harness side

Junction block (Rear view)

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SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-95

INSPECTION PROCEDURE F-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 ETACS-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 ETACS-ECU

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

Step 1. M.U.T.-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-18

.

NO : 

Go to Step 2.

Windshield Wiper Motor Drive Circuit

ETACS-ECU

J/B SIDE

CIRCUIT
BREAKER

WIPER SPEED
SWITCHING
RELAY

WINDSHIELD
WIPER MOTOR

INPUT SIGNAL

· WINDSHIELD WIPER HI SPEED SWITCH
· WINDSHIELD WIPER INTERMIT SWITCH

· WINDSHIELD WIPER LO SPEED SWITCH
· WINDSHIELD WIPER MIST SWITCH

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

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