2005 MITSUBISHI 380 Trunk lock

GENERAL DESCRIPTION
SIMPLIFIED WIRING SYSTEM (SWS)54B-4
.
FORGOTTEN KEY PREVENTION
FUNCTION
If the driver's door is locked while it 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 sec-
ond up to 5 times including the first attempt).
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, approxi-
mately 0.3 second later the ETACS-ECU acti-
vates 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).
POWER WINDOW RELAY CONTROL
.
POWER WINDOW RELAY OPERATION
If the ignition switch is turned to "ON" or "ACC" posi-
tion, the power window relay is energized to activate
the power windows.
.
POWER WINDOW TIMER FUNCTION
Even after the ignition is switched off, the
ETACS-ECU keeps the power window relay acti-
vated for approximately 30 seconds, enabling raising
and lowering of the power windows by using the
power window switches. After approximately 30 sec-
onds, the power window relay is deactivated. During
this timed operation, if the driver or passenger doors
are opened, the power window relay is deactivated
from that moment.
KEYLESS ENTRY SYSTEM
.
KEYLESS ENTRY HAZARD ANSWER-
BACK FUNCTION
If the keyless entry transmitter is used to send a lock
signal to the ETACS-ECU, all doors, the liftgate, and
the glass hatch are locked and the hazard warning
lamps flash once. If an unlock signal is sent, the
driver's door is unlocked first, and if a second signal
is sent, all doors, the liftgate, and the glass hatch are
unlocked. Each time the unlock signal is sent, the
hazard warning lamps flash twice.
.
KEYLESS ENTRY HORN ANSWERBACK
FUNCTION
If the keyless entry transmitter is used to send 2 lock
signals to the ETACS-ECU, the first signal locks all
doors, while the second signal sounds the horn once.
.
TRUNK UNLOCK FUNCTION
Press the "TRUNK" button twice within 5 seconds
and the trunk lid will be unlocked.
.
TIMED LOCKING MECHANISM
After unlocking the doors with the keyless entry
transmitter, if no doors are opened or if the ignition
key is not inserted, the ETACS-ECU automatically
locks the doors in 30 seconds.
SUNROOF CONTROL
.
SUNROOF TIMER FUNCTION
The ETACS-ECU enables opening and closing of the
sunroof for 30 seconds after the ignition is switched
off. During this timed operation, if the driver's or front
passenger’s door is opened, the sunroof timer func-
tion is deactivated from that moment.
WINDSHIELD WIPERS AND WASHERS
.
LOW SPEED WIPER, HIGH SPEED WIPER
CONTROL
When the ignition switch in at the ACC or ON
position, and the windshield low speed wiper
switch of the column switch is turned ON, the
front-ECU turns ON the windshield wiper drive
signal, turns OFF (LO) the windshield wiper
speed relay, and operates the windshield wiper at
low speed.
When the windshield high speed wiper switch is
turned ON, the windshield wiper drive signal is
turned ON, the windshield wiper speed switching
relay is turned ON (HI), and the windshield wiper
is operated at high speed.
.

GENERAL DESCRIPTION
SIMPLIFIED WIRING SYSTEM (SWS)54B-7
SEAT BELT INDICATOR
If any of the following conditions is met with the igni-
tion switch at "ON" or "ST", the ETACS-ECU illumi-
nates, flashes or extinguishes the seat belt indicator
by using the driver's seat belt switch signal and the
vehicle speed signal sent from the combination
meter.
Illuminates when the ignition switch is at "ON"
and the seat belt switch is turned on (the driver's
seat belt is unfastened).
Flashes and illuminates the indicator 12 cycles
(after 0.5 seconds) if any of the following condi-
tions is met when sixty seconds or more have
elapsed since the ignition switch is turned "ON".
One cycle consists of five-second "flashing" and
then three-second "illumination".
a. The vehicle speed has reached 8 km/h (5
mph) while the seat belt switch is turned on
(driver's seat belt is not fastened) with the
ignition switch "ON.
b. The seat belt switch has been turned on
(driver's seat belt has not been fastened) for
at least ten seconds while the ignition switch
has been turned "ON" and the vehicle speed
has been 8 km/h (5 mph) or more.
NOTE: Once this timer operation has been acti-
vated, it will not be activated again until the
vehicle speed reduces to 3 km/h (2 mph) or
less even if any of the following conditions is
met.
The indicator stops illuminating if the ignition
switch or the seat belt switch is turned off (the
driver's seat belt is fastened) while the timer
operation is active.
DOOR-AJAR INDICATOR LAMP
The combination meter receives the signal sent from
the ETACS-ECU about whether each door or trunk is
open or closed and turns the door ajar indicator lamp
on and off. While the door ajar indicator is illumi-
nated, the door ajar warning function is activated and
the door ajar indicator lamp flashes 4 times. If the
door remains open even after the 4 warning flashes,
the door ajar indicator lamp will be illuminated again.
CONFIGURATION FUNCTION
The following functions can be adjusted by operating
the middle-grade multi center display (if equipped).
Keyless entry horn answerback function
Keyless entry hazard lamp answerback function
Timed locking mechanism
Turn-signal lamp buzzer
Door ajar warning buzzer
Adjustment of door unlocking operation on key-
less entry system
Vehicle speed-dependent wiper function
Headlamp automatic shutdown function
Delay-off time of the dome lamp
Interior lamp automatic shutoff function
Initialisation of above mentioned functions

INPUT SIGNAL CHART
SIMPLIFIED WIRING SYSTEM (SWS)54B-62
DIAGNOSTIC TOOL OR VOLTMETER
If a problem is found in the Pulse Check, observe the
table below.
SYMPTOM INSPECTION
PROCEDUREREFERENCE
PA G E
ETACS-ECU does not receive any signal from the key reminder switch. N-1
P.54B-432
ETACS-ECU does not receive any signal from the hazard warning lamp
switch.N-2
P.54B-436
ETACS-ECU does not receive any signal from any of the door switches. N-3
P.54B-440
ETACS-ECU does not receive any signal from the door lock key cylinder
switch.N-4
P.54B-446
ETACS-ECU does not receive any signal from the front door lock actuator. N-5
P.54B-451
ETACS-ECU does not receive any signal from the door lock switch
(incorporated in the power window main switch and front power window
sub switch).N-6
P.54B-460
ETACS-ECU does not receive any signal from the trunk lid latch assembly. N-7
P.54B-469
Transmitter ETACS-ECU does not receive any signal from the lock,
unlock, trunk or panic switch.N-8
P.54B-472
ETACS-ECU does not receive any interior lamp loaded signal. N-9
P.54B-474

SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-187
INSPECTION PROCEDURE D-5: Power Window: Front or rear passenger's power windows do not
work at all by operating the power window main switch.
.
CIRCUIT OPERATION
When you operate each power window switch for
front or rear passengers (incorporated in the power
window main switch), the corresponding power win-
dow motor operates, opening or closing each power
window.
.
TECHNICAL DESCRIPTION (COMMENT)
If the corresponding power window opens and closes
normally when each power window sub-switch is
operated, the power window main switch may be
defective.
.
TROUBLESHOOTING HINT
Refer to circuit diagrams GROUP-90
Refer to configuration diagrams GROUP-80
The power window main switch may be defective
DIAGNOSIS
Check that power window sub switches operate normally.
Q: A power window cannot work by using the power
window main switch. Can you operate the power
window by using the corresponding power window sub
switch?
YES : Replace the power window main switch. Check that
the front or rear passenger's power window can work
normally by means of power window main switch.
NO : Refer to Symptom Chart P.54B-57 before resolving
this trouble.
KEYLESS ENTRY SYSTEM
GENERAL DESCRIPTION CONCERNING THE KEYLESS ENTRY SYSTEMM1549022000255
The following ECUs affect the functions and control
of the keyless entry system.
FUNCTIONCONTROL
ECU
All door lock function Pressing the transmitter lock button ETACS-ECU
Driver’s door unlock function Pressing the transmitter unlock button once ETACS-ECU
All door unlock function Pressing the transmitter unlock button twice ETACS-ECU
Trunk unlock function Pressing the transmitter trunk button twice ETACS-ECU
Keyless entry hazard answerback and horn answerback function ETACS-ECU
Timed locking mechanism ETACS-ECU

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.

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.
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."

SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-205
INSPECTION PROCEDURE E-4: Keyless Entry System: The trunk is not opened when the keyless
entry transmitter "TRUNK" button is operated.
.
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
The wiring harness or connectors may have
loose, corroded, or damaged terminals, or termi-
nals pushed back in the connector
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. Check that the doors can be locked and unlocked
by using the keyless entry transmitter.
Q: Can the doors be locked and unlocked normally when
the keyless entry transmitter is operated?
YES : Go to Step 2.
NO : Refer to Inspection Procedure E-1 "Keyless entry
system does not operate P.54B-191."

SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-206
STEP 2. Check the input signal (by using the pulse check
mode of the monitor).
Check input signals from the transmitter.
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 "TRUNK" button.
(4) Check that diagnostic tool MB991958 sounds
Q: When the transmitter "TRUNK" button is turned ON,
does diagnostic tool MB991958 sound?
YES : Go to Step 3.
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."