Mitsubishi 380. Manual - part 48

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-189

DRIVER’S DOOR UNLOCK FUNCTION

.

PRESSING THE TRANSMITTER UNLOCK 
BUTTON ONCE

When the transmitter unlock button is pressed once, the 
ETACS-ECU energizes its door unlock relay to operate the 
door lock actuator of the driver’s door for 0.25 seconds, thus 
unlocking only the driver’s door.

ALL DOOR UNLOCK FUNCTION

.

PRESSING THE TRANSMITTER UNLOCK 
BUTTON TWICE

When the transmitter unlock button is pressed twice, the 
ETACS-ECU energizes its door unlock relay to operate the 
driver’s door lock actuator and the other door lock actuators for 
0.25 seconds each in succession. All the doors will be 
unlocked.

NOTE: If the timed locking function is available, the doors will 
be locked in 30 seconds after the initial unlocking. Therefore, 
the second door unlocking should be done within 30 seconds 
after that initial unlocking.

TRUNK UNLOCK FUNCTION

.

PRESSING THE TRANSMITTER TRUNK BUTTON

Press the "TRUNK" button twice within 5 seconds and the trunk 
lid will be unlocked.

AC200819AD

ON 

(UNLOCK)

OFF 

Transmitter

unlock 

button

t: 0.25 second

OFF

ON

Door unlock relay 

output

Driver's door 

lock actuator  UNLOCK

LOCK

t

AC202610 AF

ON 

(UNLOCK)

OFF

Transmitter

unlock button

t: 0.25 seconds

OFF

ON

Door unlock relay 

output

LOCK

UNLOCK

LOCK

UNLOCK

Driver's door 

lock actuator 

t

t

All door 

lock actuator 

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-190

KEYLESS ENTRY HAZARD ANSWERBACK AND 
HORN ANSWERBACK FUNCTION

.

KEYLESS ENTRY HAZARD ANSWERBACK 

FUNCTION*

1

If the keyless entry transmitter is used to send a lock signal to 
the ETACS-ECU, all doors are locked and the hazard warning 
lamps flash once. If an unlock signal is sent, the driver's door is 

unlocked first,*

2

 and if a second signal is sent, all doors are 

unlocked. Each time the unlock signal is sent, the hazard warn-
ing lamps flash twice.

NOTE: *

1

: The hazard answerback function can be customized 

using the keyless entry transmitter (Refer to Group 42 

P.42-72

, 

Keyless Entry System) or by using the multi center display 
(middle grade type). Refer to 

P.54B-486

.

NOTE: *

2

: 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

.

.

KEYLESS ENTRY HORN ANSWERBACK 
FUNCTION

If the keyless entry transmitter is used to send a lock signal to 
the ETACS-ECU, the first signal locks all doors while the sec-
ond signal sounds the horn once.

NOTE: : The horn answerback function can be customized by 
using the keyless entry transmitter (Refer to Group 42 

P.42-72

, 

Keyless Entry System) or by using the multi center display 
(middle grade type). Refer to 

P.54B-486

.

TIMED LOCKING MECHANISM

.

After unlocking the doors with the keyless entry transmitter, if 
no doors are opened, if the ignition key is not inserted or if the 
locking function is not operated, the ETACS-ECU automatically 
locks the doors in 30 seconds.

NOTE: The timed locking function can be customized on vehi-
cles equipped with a multi center display (middle grade type). 
Refer to 

P.54B-486

.

AC209072AC

ON

OFF

OFF

ON

OFF

LOCK

UNLOCK

Illuminated
Not

illuminated

Keyless entry

transmitter switch

Lock relay output

Unlock relay output

Hazard

warning light 

flashing state

AC209073AC

LOCK

OFF

LOCK

UNLOCK

ON

OFF

Keyless entry

transmitter switch

All door 

lock actuator

Lock relay output

Horn relay output

ON

OFF

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-191

INSPECTION PROCEDURE E-1: Keyless Entry System: Keyless entry system does not operate.

.

CIRCUIT OPERATION

A receiver is incorporated in the ETACS-ECU. This 
receiver receives a lock or unlock signal from the 
transmitter.

.

TROUBLESHOOTING HINTS

• Refer to circuit diagrams GROUP-

90

• Refer to configuration diagrams GROUP-

80

• The RKE transmitter may be defective

• The ETACS-ECU may be defective

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

STEP 1. Verify the central door locking system.

Q: Does the central door locking system work normally?

YES : Go to Step 2.
NO :  Refer to Inspection Procedure C-1 "The central door 

locking system does not work at all 

P.54B-122

."

ETACS-

ECU

RECEIVER

· TRANSMITTER"LOCK"SWITCH

· TRANSMITTER"UNLOCK"SWITCH

Transmitter ("LOCK"/"UNLOCK") Input Signal

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-192

STEP 2. Check the input signal (by using the pulse check 
mode of the monitor).
Check input signals from the transmitter.

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.
(1) Connect diagnostic tool MB991958.Refer to "How to 

connect SWS monitor 

P.54B-13

."

(2) 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."

(3) Push the transmitter "LOCK" or "UNLOCK" button.
(4) Check that diagnostic tool MB991958 sounds

Q: When the transmitter "LOCK" or "UNLOCK" button is 

turned ON, does diagnostic tool MB991958 sound?
YES : Replace the ETACS-ECU. All the doors can be locked 

or unlocked by means of the transmitter.

NO :  Refer to Inspection Procedure N-8 "ETACS-ECU 

does not receive any signal from the lock, unlock, 
trunk or panic switch 

P.54B-472

."

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827