Mitsubishi 380. Manual - part 31

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-121

If the passenger's door or driver's door are locked 
while the passenger's door is open and when the key 
is still in the ignition key cylinder, approximately 0.3 
second later the ETACS-ECU activates the unlock 
relay output for 0.25 second to prevent the door from 
being locked with the key inside the vehicle.

In addition, if locking the door was not prevented, a 
re-try current is sent (an unlock relay output ON is 
sent for 0.25 second up to 5 times including the first 
attempt).

NOTE: The dotted line indicates that the system is 
trying to turn on the unlock relay if the door cannot be 
unlocked.

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-122

INSPECTION PROCEDURE C-1: Central Door Locking System: The Central Door Locking System 
does not Work at all.

NOTE: This troubleshooting procedure requires the 
use of diagnostic tool MB991958 and SWS monitor 
kit MB991813. For details on how to use the SWS 
monitor, refer to "How to connect SWS monitor 

P.54B-13

."

.

CIRCUIT OPERATION

• The ETACS-ECU controls the central door lock 

system, locking or unlocking all the doors by acti-
vating the central door lock relay (built into the 
ETACS-ECU). The ETACS-ECU uses inputs from 
the following components:

• Front door lock actuator

• Front door lock key cylinder switch

• Door lock switch, which is incorporated in the 

power window main switch or front power win-
dow sub switch

.

TROUBLESHOOTING HINTS

• Refer to circuit diagrams GROUP-

90

• Refer to configuration diagrams GROUP-

80

• The wiring harness or connectors may have 

loose, corroded, or damaged terminals, or termi-
nals pushed back in the connector

• The ETACS-ECU may be defective

AC305015AD

FUSIBLE LINK (1)

16DB305A

C-219

C-217

CONNECTORS: C-217, C-219

JUNCTION BLOCK

(REAR VIEW)

16DB309A

E-05 (B)

CONNECTOR: E-05

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-123

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) MUT-III 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-124

STEP 2. 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 3.
NO :  Repair or replace the damaged component(s). Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

. Verify that the central door locking system 

works normally.

STEP 3. Check the battery power supply circuit to the 
ETACS-ECU. Measure the voltage at ETACS-ECU 
connector C-219.
(1) Disconnect ETACS-ECU connector C-219 and measure the 

voltage available at the junction block side of the connector.

(2) Measure the voltage between terminal 2 and ground.

• The voltage should measure approximately 12 volts 

(battery positive voltage)

Q: Is the measured voltage approximately 12 volts (battery 

positive voltage)?
YES : Go to Step 5.
NO :  Go to Step 4.

54DB014A

CONNECTOR: C-219

JUNCTION BLOCK SIDE

JUNCTION BLOCK

(REAR VIEW)

54DB014A

CONNECTOR: C-219

JUNCTION BLOCK SIDE

JUNCTION BLOCK

(REAR VIEW)

AC209365EO

(JUNCTION BLOCK SIDE)

CONNECTOR C-219