Mitsubishi 380. Manual - part 91

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-361

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

AC302210

COLUMN SWITCH 
CONNECTOR

COLUMN SWITCH 
CONNECTOR AT 
HARNESS SIDE 

MB991812

AB

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-362

STEP 2. Check the input signal by using "DATA LIST" 
menu of the SWS monitor.
Check the input signals from the following switches:

• Ignition switch: ON or START

• Driver’s or front passenger’s door: open

(1) Operate 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 the diagnostic tool MB991958 display the items 

"IG SW (IG1)" and "FRONT DOOR SW" as normal 
condition?
Normal conditions are displayed for all the items : Go to 

Step 3.

Normal condition is not displayed for "IG SW (IG1)" : 

Refer to Inspection Procedure M-2 "ETACS-ECU 
does not receive any signal from the ignition switch 
(IG1) 

P.54B-408

."

Normal condition is not displayed for "FRONT DOOR 
SW" : 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 30

IG SW (IG1)

ON

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-363

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

• Interior lamp loaded signal

• 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 or 

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

Go to Step 4.

Diagnostic tool MB991958 does not sound when the 
ignition key is removed and reinserted : 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 interior lamps is illuminated, 
diagnostic tool MB991958 does not sound : Refer to 

Inspection Procedure N-9 "ETACS-ECU does not 
receive any interior lamp loaded signal 

P.54B-474

."

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

interior lamp loaded 
signal

Turn on one of the interior lamps

door switches

Open or close one of the doors

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-364

STEP 4. Check ETACS-ECU connector C-219 for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.
Q: Is ETACS-ECU connector C-219 in good condition?

YES : Go to Step 5.
NO :  Repair or replace the damaged component(s). Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

. Verify that the dome lamp illuminates 

normally.

STEP 5. Check the wiring harness between map lamp 
assembly connector D-02 (terminal 1) <without sunroof> 
or overhead console assembly connector D-03 (terminal 1) 
<with sunroof> and ETACS-ECU connector C-219 (terminal 
6).

54DB014A

CONNECTOR: C-219

JUNCTION BLOCK SIDE

JUNCTION BLOCK

(REAR VIEW)

54DB014A

CONNECTOR: C-219

JUNCTION BLOCK SIDE

JUNCTION BLOCK

(REAR VIEW)

16DB454A

CONNECTORS: D-02, D-03

D-02

D-03

D-02

D-03