2005 MITSUBISHI 380 Workshop Manual

SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-225
Washer control
When the ignition switch is in the ACC or ON posi-
tion, and the windshield washer switch is turned ON,
the front-ECU turns ON the windshield washer relay.
The windshield wiper drive signal is turned ON after
0.15 seconds until 2 seconds after the windshield washer switch goes OFF to operate the windshield
wiper continuously. When the windshield washer
switch is turned ON, if the windshield wiper is operat-
ing intermittently, intermittent operations will be con-
tinued after continuous operations.
NOTE: The wiper drive signal output time varies
according to the conditions. Refer to the following
table for details.
WHEN WIPER SWITCH IS OFF WHEN WIPER SWITCH IS SET
TO INTWHEN WIPER SWITCH IS SET
TO LO OR HI
t2 0.15
second or
less0.15 - 0.8
second0.8
second or
more0.15
second or
less0.15 - 0.8
second0.8
second or
more0.15
second or
less0.15 - 0.8
second0.8
second or
more
T0 second1.2
seconds2 seconds 0 second 1.2
seconds2 seconds 0 second 1.2
seconds2 seconds

SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-226
INSPECTION PROCEDURE G-1: Windshield Wiper and Washer: The windshield wiper do not work at
all.
NOTE: This troubleshooting procedure requires use
of Diagnostic Tool MB991958 and SWS monitor kit
MB991813. For details on how to use the SWS mon-
itor, refer to "How to connect SWS monitor
P.54B-13."
.
CIRCUIT OPERATION
The windshield wiper and washer switch sends a
signal through the column-ECU (incorporated in
the column switch) to the front-ECU. If the col-
umn-ECU sends a windshield wiper and washer
switch "ON" signal to the front-ECU, the
front-ECU turns on the relay (incorporated in the
front-ECU), thus causing the windshield wiper
and washer motor to be turned on.
If the SWS communication line is defective, the
front-ECU operates windshield wiper motor by
using the other communication lines (wiper
backup circuit) instead of that line. In this case,
the windshield wiper works at low speed regard-
less of the windshield wiper and washer switch
positions ("LO" or "HIGH").
.
TECHNICAL DESCRIPTION (COMMENT)
If the windshield wiper does not work at all, the wind-
shield wiper motor, column switch (windshield wiper
and washer switch) or the front-ECU may be defec-
tive.
.
TROUBLESHOOTING HINTS
Refer to circuit diagrams GROUP-90
Refer to configuration diagrams GROUP-80
Trouble in input signal system
The wiring harness or connectors may have
loose, corroded, or damaged terminals, or termi-
nals pushed back in the connector
The wiper motor may be defective
The column switch may be defective
The front-ECU may be defective

SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-227
DIAGNOSIS
Required Special Tools:
MB991223: Harness Set
MB991958: Diagnostic Tool (MUT-III Sub Assembly)
MB991824: Vehicle Communication Interface (V.C.I.)
MB991827: MUT-III USB Cable
MB991910: MUT-III Main Harness A
MB991813: SWS Monitor Kit
MB991806: SWS Monitor Cartridge
MB991812: SWS Monitor Harness (For Column-ECU)
MB991822: Test Probe Harness

SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-228
STEP 1. Use Diagnostic Tool MB991958 to select "ECU
COMM Check" on the SWS monitor display.
Check the following ECUs:
Column-ECU
Front-ECU
To prevent damage to Diagnostic Tool MB991958, always
turn the ignition switch to the "LOCK" (OFF) position
before connecting or disconnecting Diagnostic Tool
MB991958. Connect special tool MB991910 before con-
necting special tool MB991812. Be sure to connect special
tool MB991806 after turning on special tool MB991824.
(1) Connect the special tool. Refer to "How to connect SWS
monitor P.54B-13."
(2) Turn the ignition switch to the "ON" position.
(3) Operate Diagnostic Tool MB991958 according to the
procedure below to display "ECU COMM Check."
a. Select "Interactive Diagnosis."
b. Select "System select."
c. Select "SWS."
d. Select "SWS MONITOR."
e. Select "ECU COMM Check."
(4) Diagnostic Tool MB991958 should show "OK" on the "ECU
COMM Check" menus for both the "COLUMN ECU" and
the "FRONT ECU" menus.
Q: Is "OK" displayed for the "COLUMN ECU" and "FRONT
ECU" menu?
"OK" is displayed for all the items : Go to Step 2.
"NG" is displayed for the "COLUMN ECU" menu : Refer
to Inspection Procedure A-2 "Communication with the
column switch (column-ECU) is not possible
P.54B-68."
"NG" is displayed for the "FRONT ECU" menu : Refer to
Inspection procedure A-4 "Communication with the
front-ECU is not possible P.54B-80."

SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-229
STEP 2. Check the input signal by using "FUNCTION
DIAG." menu of the SWS monitor.
Check the input signals from the following switches:
Ignition switch: ACC
Windshield wiper switch: INT
(1) Operate the MUT-III according to the procedure below to
display "F.WIPER INT."
a. Select "Interactive Diagnosis."
b. Select "System select."
c. Select "SWS."
d. Select "SWS MONITOR."
e. Select "Function Diag."
f. Select "WIPER."
g . S e l e c t " F. W I P E R I N T. "
(2) Check that normal conditions are displayed for the items
described in the table below.
Q: Are normal conditions displayed for "INT WIPER SW"
and "FRONT ECU ACK"?
Normal conditions displayed for all the items : Go to
St e p 3 .
Normal condition is not displayed for the "INT WIPER
SW" : Replace the column switch. Verify that the windshield
wiper works normally.
Normal condition is not displayed for the "FRONT ECU
ACK" : Replace the front-ECU. Verify that the windshield
wiper works normally.
STEP 3. Check windshield wiper motor connector A-03 for
loose, corroded or damaged terminals, or terminals
pushed back in the connector.
Q: Is windshield wiper motor connector A-03 in good
condition?
YES : Go to Step 4.
NO : Repair or replace the damaged component(s). Refer
to GROUP 00E, Harness Connector Inspection
P.00E-2. Verify that the windshield wiper works
normally. ITEM NO. ITEM NAME NORMAL
CONDITION
ITEM 05 INT WIPER SW ON
ITEM 70 FRONT ECU ACK NORMAL ACK or
HI-BEAM ACK

SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-230
STEP 4. Check the windshield wiper motor.
(1) Disconnect windshield wiper motor connector A-03.
(2) Connect a battery to the windshield wiper motor as shown.
Then check that the windshield wiper motor operates
normally at high and low speeds.
Q: Does the windshield wiper motor operate normally?
YES : Go to Step 5.
NO : Replace the windshield wiper motor. Verify that the
windshield wiper works normally.

SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-231
STEP 5. Check the ground circuit to the windshield wiper
motor. Measure the resistance at the windshield wiper
motor connector A-03.
(1) Disconnect windshield wiper motor connector A-03 and
measure the resistance available at the wiring harness side
of the connector.
(2) Measure the resistance value between terminal 1 and
ground.
The resistance should be 2 ohms or less.
Q: Is the measured resistance 2 ohms or less?
YES : Go to Step 7.
NO : Go to Step 6.
STEP 6. Check the wiring harness between windshield
wiper motor connector A-03 (terminal 1) and ground.
Q: Is the wiring harness between windshield wiper motor
connector A-03 (terminal 1) and ground in good
condition?
YES : No action is necessary and testing is complete.
NO : The wiring harness may be damaged or the
connector(s) may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the wiring harness as necessary. Verify the
windshield wiper works normally.
STEP 7. Check front-ECU connector A-12X for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is front-ECU connector A-12X in good condition?
YES : Go to Step 8.
NO : Repair or replace the damaged component(s). Refer
to GROUP 00E, Harness Connector Inspection
P.00E-2. Verify that the windshield wiper works
normally.

SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-232
STEP 8. Check the ignition switch (ACC) circuit to the
front-ECU. Measure the voltage at front-ECU connector
A-12X.
(1) Disconnect front-ECU connector A-12X and measure the
resistance available at the relay box side of the connector.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 28 and ground.
The voltage should measure approximately 12 volts
(battery positive voltage).
Q: Is the measured voltage approximately 12 volts (battery
positive voltage)?
YES : Replace the front-ECU. Verify that the windshield
wiper works normally.
NO : Go to Step 9.
STEP 9. Check the wiring harness between front-ECU
connector A-12X (terminal 28) and the ignition switch
(ACC).