2005 MITSUBISHI 380 ECU

SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-221
STEP 1. Use diagnostic tool MB991958 to select "ECU
COMM Check" on the SWS monitor display.
Check the following ECUs:
ETACS-ECU
Sunroof-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 "LOCK" (OFF) position.
(3) Operate the 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 "ETACS ECU" and the
"SUNROOF ECU" menus.
Q: Is "OK" displayed for both the "ETACS ECU" and
"SUNROOF ECU" menus?
"OK" is displayed for all the items : Go to Step 2.
"NG" is displayed for the "ETACS ECU" menu : Refer to
Inspection Procedure A-3 "Communication with the
ETACS-ECU is not possible P.54B-74."
"NG" is displayed for the "SUNROOF ECU" menu :
Refer to Inspection Procedure A-5 "Communication
with the sunroof-ECU is not possible P.54B-87."

SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-222
STEP 2. Check the input signal by using "FUNCTION
DIAG." menu of the SWS monitor.
Observe how the input signal is changed when the ignition
switch is turned from the ON position to the "LOCK" (OFF)
position.
(1) Operate the MUT-III according to the procedure below to
display "SUNROOF-OPE."
a. Select "Interactive Diagnosis."
b. Select "System select."
c. Select "SWS."
d. Select "SWS MONITOR."
e. Select "Function Diag."
f. Select "SUNROOF."
g. Select "SUNROOF-OPE."
(2) Check that normal conditions are displayed for the items
described in the table below.
Q: Does the MUT-III display the items "IG SW (IG1)" and
"S/R ECU ACK" as normal condition?
Normal conditions displayed for all the items : Replace
the sunroof motor assembly. Check that the sunroof
timer function works normally.
Normal condition is not displayed for the "IG SW (IG1)" :
Refer to Inspection Procedure M-2 "ETACS-ECU
does not receive a signal from the ignition switch
(IG1) P.54B-408."
Normal condition is not displayed for the "S/R ECU
ACK" : Replace the sunroof motor assembly. Check that the
sunroof timer function works normally. ITEM NO. ITEM NAME NORMAL
CONDITION
ITEM 30 IG SW (IG1) OFF
ITEM 72 S/R ECU ACK NORMAL ACK

SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-223
54B
WINDSHIELD WIPER AND WASHER
GENERAL DESCRIPTION CONCERNING THE WINDSHIELD WIPER AND WASHERM1549021500257
Refer to circuit diagrams GROUP-90
Refer to configuration diagrams GROUP-80The following ECUs affect the functions and control
of the windshield wiper and washer.
Windshield wiper and washer control function
.
Intermittent control (vehicle speed-dependent
variable type)
ETACS-ECU uses the dial position of the variable intermittent
wiper control switch and the vehicle speed signal sent by the
combination meter to calculate the interval to be sent to the
front-ECU.
NOTE: The speed-sensitive wiper can be customized on vehi-
cles equipped with a multi center display (middle grade type).
Refer to P.54B-486.
The front-ECU determines the intermittent time T1 from the
input SWS data signal, and turns ON the windshield wiper drive
signal. When the wiper is at the STOP position, the windshield
wiper auto-stop signal goes OFF, then turns OFF the wind-
shield wiper drive signal. After the intermittent time T1 seconds
from when the windshield wiper drive signal turned ON, the
windshield wiper drive signal is turned ON again and the above
operation is repeated.
NOTE: If the intermittent time T1 is within 2 seconds, the wiper
is operated consecutively at LOW-speed by the front-ECU.
.
FUNCTION CONTROL ECU
Windshield wiper and washer
control functionIntermittent control (Vehicle
speed-dependent variable type)ETACS-ECU, front-ECU, column
switch
Mist wiper control ETACS-ECU, column switch
Low speed wiper and high speed
wiper controlETACS-ECU, column switch
Washer control ETACS-ECU, column switch

SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-224
Mist wiper control
When the ignition switch is in the ACC or ON posi-
tion, and the windshield mist wiper switch is turned
ON, the front-ECU turns ON the windshield wiper
drive signal. At the same time, the wiper speed
switching relay is turned ON (HIGH-SPEED). While
the windshield mist wiper switch is ON, the wind-
shield wiper will operate at high speed. Then, if the
windshield mist wiper switch is turned off, the wiper
operates at low speed until it stops at the predeter-
mined park position.When the windshield mist switch is turned on briefly,
the wiper operates once at low speed.
At the point the windshield mist switch is turned ON,
if the windshield wiper has been operating intermit-
tently, the same operations as the above will be per-
formed while the windshield mist wiper switch is ON.
After the windshield mist wiper switch goes OFF, the
intermittent operations will be set again T1 seconds
after the last windshield wiper auto-stop signal turn-
ing ON.
.
Low speed wiper and high speed wiper control
When the ignition switch is at the ACC or ON posi-
tion, and the windshield low speed wiper switch of
the column switch is turned ON, the front-ECU turns
ON the windshield wiper drive signal, turns OFF (LO)
the windshield wiper speed relay, and operates the windshield wiper at low speed. Next, when the wind-
shield high speed wiper switch is turned ON, the
windshield wiper drive signal is turned ON, the wind-
shield wiper speed switching relay is turned ON (HI),
and the windshield wiper is operated at high speed.
.

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."