Mitsubishi Grandis. Manual - part 187
SYMPTOM PROCEDURES
SMART WIRING SYSTEM (SWS) USING SWS MONITOR
54C-210
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 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 front-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 front-ECU and
the SWS communication lines are normal.
• Turn the ignition switch to the ACC position.
ECUS TO BE CHECKED
• COLUMN ECU
• FRONT ECU
OK: "OK" are displayed for all the items
Q: Are the check result normal?
"OK" are 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 "FRONT ECU" menu. :
Refer to Inspection Procedure A-4
"Communication with the front-ECU is not
possible
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