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
."
"NG" is displayed on the "ETACS ECU" menu. :
Refer to Inspection Procedure A-3
"Communication with the ETACS-ECU is
not possible
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
."
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
.
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
).
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
).
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
).
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
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