Mitsubishi 380. Manual - part 37

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-145

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

STEP 1. Use diagnostic tool MB991958 to select "ECU 
COMM Check" on the SWS monitor display. 
Check the ETACS-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 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" menu for the "ETACS ECU" menu.

Q: Is "OK" displayed for the "ETACS ECU" menu?

YES : Go to Step 2.
NO :  Refer to Inspection Procedure A-3 "Communication 

with the ETACS-ECU is not possible 

P.54B-74

."

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

COLUMN SWITCH 
CONNECTOR

COLUMN SWITCH 
CONNECTOR AT 
HARNESS SIDE 

MB991812

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-146

STEP 2. Check the input signal by using "DATA LIST" 
menu of the SWS monitor.
Turn the ignition switch to the "ON" position before checking 
input signals from the ignition switch (IG1).
(1) Operate the diagnostic tool MB991958 according to the 

procedure below to display "ETACS ECU."
a. Select "Interactive Diagnosis."
b. Select "System Select."
c. Select "SWS."
d. Select "SWS MONITOR."
e. Select "Data List."
f.

Select "ETACS ECU."

(2) Check that normal conditions are displayed for the items 

described in the table below.

Q: Does diagnostic tool MB991958 display "FRONT DOOR 

SW" as normal condition?
YES : Go to Step 3.
NO :  Refer to Inspection Procedure M-4 "ETACS-ECU 

does not receive any signal from the front door 
switches 

P.54B-413

."

ITEM NO.

ITEM NAME

NORMAL CONDITION

ITEM 32

FRONT DOOR SW ON

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-147

STEP 3. Check the input signal (by using the pulse check 
mode of the monitor).
Check the following switches and input signals:

• Key reminder switch

• Door switches

(1) Operate diagnostic tool MB991958 according to the 

procedure below to display "Pulse check."
a. Select "Interactive Diagnosis."
b. Select "System Select."
c. Select "SWS."
d. Select "Pulse Checking."

(2) Check if diagnostic tool MB991958 sounds or not.

Q: When the key reminder switch, any door switch is 

operated, does diagnostic tool MB991958 sound?
Buzzer of diagnostic tool MB991958 sounds normally. : 

Replace the ETACS-ECU. The forgotten key 
prevention function should work normally.

When the ignition key is removed and inserted, 
diagnostic tool MB991958 does not sound. : Refer to 

Inspection Procedure N-1 "ETACS-ECU does not 
receive any signal from the key reminder switch 

P.54B-432

."

When one of the doors is opened and closed, 
diagnostic tool MB991958 does not sound : Refer to 

Inspection Procedure N-3 "ETACS-ECU does not 
receive any signal from any of the door switches 

P.54B-440

."

ITEM NAME

CONDITION

key reminder switch Remove and reinsert the ignition key

Door switches

Open or close one of the doors

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-148

POWER WINDOWS

GENERAL DESCRIPTION CONCERNING THE POWER WINDOWS

M1549021900244

The following ECUs affect the functions and control 
of the power windows.

• Refer to circuit diagrams GROUP-

90

• Refer to configuration diagrams GROUP-

80

FUNCTION

CONTROL ECU

Power window main 
switch function

Raises the driver’s power window

Power window main switch

Lowers the driver’s power window

Power window main switch

Lowers the driver’s power window by one-touch down 
function

Power window main switch

Raises the passenger’s power window

Power window main switch

Lowers the passenger’s power window

Power window main switch

Power window sub 
switch function

Raises the passenger’s power window

Power window sub switch

Lowers the passenger’s power window

Power window sub switch

Power window timer function

ETACS-ECU