Mitsubishi 380. Manual — part 56

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

CAUTION

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

."

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AC302210

COLUMN SWITCH
CONNECTOR

COLUMN SWITCH
CONNECTOR AT
HARNESS SIDE

MB991812

AB

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

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AC302210

COLUMN SWITCH
CONNECTOR

COLUMN SWITCH
CONNECTOR AT
HARNESS SIDE

MB991812

AB

NEXT PAGE

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-223

54B

WINDSHIELD WIPER AND WASHER

GENERAL DESCRIPTION CONCERNING THE WINDSHIELD WIPER AND WASHER

M1549021500257

• Refer to circuit diagrams GROUP-

90

• Refer to configuration diagrams GROUP-

80

The 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 function

Intermittent 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 control

ETACS-ECU, column switch

Washer control

ETACS-ECU, column switch

AC305397

Intermittent

time T1

(seconds)

Variable intermittent wiper

control switch position

Intermittent

time T1

(seconds)

Vehicle speed (km/h)

When at SLOW position

Change in intermittent time

according to vehicle speed

Change in intermittent time by variable

intermittent wiper control switch (when

vehicle is stationary)

0

100

19.0

0

FAST

SLOW

19.0

AB

60

4.6

14.0

4.6

1.6

When at FAST position

2.0

AC200355AC

ON

OFF

ON

OFF

WINDSHIELD

WIPER

AUTOSTOP

SIGNAL

WINDSHIELD

WIPER DRIVE

SIGNAL

T1

T1

T1: Intermittent time

PREVIOUS PAGE

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.

.

AC200047AB

ON

OFF

ON

OFF

ON

OFF

ON (HIGH)

Windshield mist wiper switch

Windshield wiper auto-stop
signal

Windshield wiper drive signal

Windshield wiper speed
switching relay

OFF (LOW)

When windshield
wiper switch is OFF

When windshield intermittent
wiper is operating

T1: Intermittent time

T1

T1

AC005437AF

ON

OFF

ON

OFF

ON

OFF

ON (HIGH)

Windshield low-speed
wiper switch

Windshield high-speed
wiper switch

Windshield wiper auto-stop
signal

ON

OFF

Windshield wiper
drive signal
Windshield wiper
speed switching relay OFF (LOW)

Low speed operations

High speed operations