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)

Main

Index

Group

TOC

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)

Main

Index

Group

TOC

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)

Main

Index

Group

TOC

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

Main

Index

Group

TOC