Mitsubishi Grandis. Manual - part 54
SYMPTOM PROCEDURES
SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR
54B-213
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 front-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
DIAGNOSTIC PROCEDURE
Step 1. MUT-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
.
NO :
Go to Step 2.
Step 2. Pulse check.
Check the input signals below which are related to
the windshield wiper.
OK: The MUT-III sounds or the voltmeter
needle fluctuates.
Q: Are the check result normal?
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
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.