Mitsubishi 380. Manual — part 30

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-117

STEP 2. Check whether the turn-signal lamps illuminate.
When the turn-signal lamp switch or the hazard warning lamp
switch is operated, check that the turn-signal lamps flash.

Q: Are the turn-signal lamps in good condition?

YES : Go to Step 3.
NO : First, repair the turn-signal lamp(s). Refer to

Inspection Procedure I-3 "One of the turn-signal
lamps does not illuminate

P.54B-316

."

STEP 3. Use diagnostic tool MB991958 to select "ECU
COMM Check" on the SWS monitor display.
Check the following ECUs:

• ETACS-ECU

• Column-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 "ON" position.
(3) Operate diagnostic tool MB991958 according to the

procedure below to display "ECU COMM Check."

1. Select "Interactive Diagnosis."
2. Select "System Select."
3. Select "SWS."
4. Select "SWS MONITOR."
5. Select "ECU COMM Check."

(4) diagnostic tool MB991958 should show "OK" on the "ECU

COMM Check" menus for both the "ETACS ECU" and the
"COLUMN ECU" menus.

Q: Is "OK" displayed for both the "ETACS ECU" and

"COLUMN ECU" menus?
"OK" is displayed for all the items : Go to Step 4.
"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 "ETACS ECU" menu : Refer to

Inspection Procedure A-3 "Communication with the
ETACS-ECU is not possible

P.54B-74

."

"NG" is displayed for all the items : 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-118

STEP 4. Check the input signal by using "FUNCTION
DIAG." menu of the SWS monitor.
Check the input signals from the following switches:

• Ignition switch: ON

• Driver’s door: Open

• All door: Closed

(1) Operate diagnostic tool MB991958 according to the

procedure below to display "OTHER ALARM"
a. Select "Interactive Diagnosis."
b. Select "System Select."
c. Select "SWS."
d. Select "SWS MONITOR."
e. Select "Function Diag."
f.

Select "BUZZER."

g. Select "OTHER ALARM"

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

described in the table below.

NOTE: The diagnostic tool MB991958 display changes
when the driver's or the front passenger's door is opened. If
any of the doors is open, the system cannot be checked
correctly.

Q: Does diagnostic tool MB991958 display the items "IG

SW (IG1)" and "BUZZER" as normal condition?
Normal conditions are displayed for all the items :

Replace the ETACS-ECU. Check that the turn-signal
lamp buzzer function works normally.

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 "BUZZER" :

Replace the ETACS-ECU. Check that the turn-signal
lamp buzzer function works normally.

CENTRAL DOOR LOCKING SYSTEM

GENERAL DESCRIPTION CONCERNING CENTRAL DOOR LOCKING SYSTEM

M1549021100271

The following ECUs affect the functions and control
of the central door locking system.

ITEM NO.

ITEM NAME

NORMAL
CONDITION

ITEM 30

IG SW (IG1)

ON

ITEM 43

BUZZER

ON

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AC302210

COLUMN SWITCH
CONNECTOR

COLUMN SWITCH
CONNECTOR AT
HARNESS SIDE

MB991812

AB

FUNCTION

CONTROL ECU

Central door locking system

ETACS-ECU

Forgotten key prevention function

ETACS-ECU

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-119

CENTRAL DOOR LOCKING SYSTEM

.

DOOR UNLOCKING BY OPERATING THE
DRIVER’S DOOR LOCK KEY CYLINDER

When the ignition key is inserted in the driver’s door lock key
cylinder and turned anti-clockwise to unlock the driver’s door,
the ETACS-ECU operates its door unlock relay and passes a
current through the door lock actuator of the driver’s door for
0.25 seconds to unlock only the driver’s door.
When the ignition key is turned anti-clockwise again, the
ETACS-ECU operates its door unlock relay and passes a cur-
rent through the door lock actuators of all doors for 0.25 sec-
onds and to unlock all doors.

NOTE: Vehicles with a multi center display (middle grade type)
can be customized so that a single unlock operation will unlock
all doors. Refer to

P.54B-486

.

.

DOOR LOCKING OR UNLOCKING BY
OPERATING THE DRIVER’S OR FRONT
PASSENGER’S DOOR LOCK SWITCH

When the door is locked by the driver’s or front passenger’s
door lock switch, the ETACS-ECU operates its door lock relay
and passes a current through the door lock actuators of all
doors for 0.25 seconds to lock all doors.
When the door is unlocked by the driver’s or front passenger's
door lock switch, the ETACS-ECU operates its door unlock
relay and passes a current through the door lock actuators of
all doors for 0.25 seconds to unlock all doors.
When the door is locked and unlocked by driver’s or front pas-
senger's door lock switch consecutively, the ETACS-ECU oper-
ates its door lock relay and passes a current through the door
lock actuators of all doors for 0.25 seconds to lock all doors.
Then, the ETACS-ECU operates its door unlock relay and
passes a current through the door lock actuators of all doors for
0.25 seconds to unlock all doors. Due to this, there may be a
time lag between the driver’s or front passenger's door lock
switch actuation and the time when all doors are unlocked.

AC305383 AB

ON

(UNLOCK)

OFF

DRIVER'S
DOOR LOCK KEY
CYLINDER SWITCH

t: 0.25 SECOND

OFF

ON

DRIVER'S DOOR
UNLOCK RELAY
OUTPUT

LOCK

UNLOCK

LOCK

UNLOCK

DRIVER'S DOOR
LOCK ACTUATOR

t

ALL DOOR'S
LOCK ACTUATOR

t

OFF

ON

t

OTHER DOOR
UNLOCK RELAY
OUTPUT

AC305384

t

AB

ON

(LOCK)

ON

(UNLOCK)

ON

OFF

ON

OFF

DRIVER'S OR
FRONT
PASSENGER'S
DOOR LOCK
SWITCH

UNLOCK RELAY
OUTPUT

LOCK RELAY
OUTPUT

t: 0.25 SECOND

t

t

TIME LAG

t

t

OFF

LOCK

UNLOCK

ALL DOORS
LOCK
ACTUATOR

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-120

FORGOTTEN KEY PREVENTION FUNCTION

If the driver's door is locked while it is open

If the driver's door is locked while it is open and when
the key is still in the ignition key cylinder, approxi-
mately 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.

If the front passenger's door is open when it is locked with the driver's door switch

AC209078AB

ON

OFF

ON

OFF

Lock relay output

Unlock relay output

LOCK

UNLOCK

Driver's door

lock actuator

ON (Key removed)

OFF (Key inserted)

Key reminder switch

t

ON (Driver's door is open)

Driver's door switch

OFF (Driver's door is closed)

t

t: 0.3 seconds
T1: 0.25 seconds
T2: 1 seconds

T2

T2

T2

T2

T1

T1

T1

T1

T1

T1

AC209079AB

ON

OFF

ON

OFF

Lock relay output

Unlock relay output

LOCK

UNLOCK

Driver's door

lock actuator

LOCK

UNLOCK

Front passenger's door

lock actuator

ON (Key removed)

OFF (Key inserted)

Key reminder switch

t

ON (Front passenger's

door is open)

Front passenger's

door switch

OFF (Front passenger's

door is closed)

t

t

t

t: 0.3 seconds

T1: 0.25 seconds

T2: 1 seconds

T2

T2

T2

T2

T2

T2

T2

T2

T1

T1

T1

T1

T1

T1

T1

T1

T1

T1

T1

T1