Mitsubishi Colt Ralliart. Manual - part 396

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-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. ECU check by using the SWS monitor.
Check that the power supply and earth lines to the 
column switch (column-ECU) and the ETACS-ECU 
and the SWS communication lines are normal.

• Turn the ignition switch to the ON position.

ECU TO BE CHECKED

• COLUMN ECU

• ETACS-ECU

OK: "OK" are displayed for all the items

Q: Are the check results 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-37

."

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

Refer to Inspection Procedure A-3 
"Communication with the ETACS-ECU is 
not possible 

P.54C-41

."

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: Are the check results 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 N-1 "The 
ignition switch (ACC) signal is not received 

P.54C-201

."

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.

Item No.

Item name

Normal 
condition

Item 05

INT WIPER SW

ON

Item 31

IGNITION SW 
ACC

ON

AC313860

Connector: A-04

Harness side

AB

A-04 (GR)

Main

Index

Group

TOC

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-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.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 

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)

Main

Index

Group

TOC

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-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)

Main

Index

Group

TOC

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-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

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

Main

Index

Group

TOC