2005 MITSUBISHI 380 key

SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-144
INSPECTION PROCEDURE C-5: Central Door Locking System: Forgotten Key Prevention Function
does not Work Normally.
NOTE: This troubleshooting procedure requires use
of diagnostic tool MB991958 and SWS monitor kit
MB991813. For details on how to use the SWS mon-
itor, refer to "How to connect SWS monitor
P.54B-13."
.
CIRCUIT OPERATION
The ETACS-ECU operates the forgotten key preven-
tion function according to the following switches:
Key reminder switch: OFF
Front door switch: ON
Front door lock actuator switch: being turned on
The ETACS-ECU operates the forgotten key preven-
tion function under the following conditions:
Ignition key: inserted into the ignition key cylinder
Front door: open
Front door lock: being locked
.
TECHNICAL DESCRIPTION (COMMENT)
If the function does not work normally, the input cir-
cuit system from the switches or the ETACS-ECU
may be defective (refer to "CIRCUIT OPERATION").
.
TROUBLESHOOTING HINTS
Refer to circuit diagrams GROUP-90
Refer to configuration diagrams GROUP-80
Trouble in input signal system
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

SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-147
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
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 is
operated, does diagnostic tool MB991958 sound?
Buzzer of diagnostic tool MB991958 sounds normally. :
Replace the ETACS-ECU. The forgotten key
prevention function should work normally.
When the ignition key is removed and inserted,
diagnostic tool MB991958 does not sound. : 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 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
Door switches Open or close one of the doors

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-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.

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."

SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-193
INSPECTION PROCEDURE E-2: Keyless Entry System: The dome lamp, the turn-signal lamps and the
horn do not operate through the answerback function.
.
CIRCUIT OPERATION
The ETACS-ECU operates the following functions
when it receives lock or unlock signal from the trans-
mitter:
Dome lamp answerback function
Turn-signal lamp answerback function
Horn answerback function
.
TECHNICAL DESCRIPTION (COMMENT)
The turn-signal lamps and horn answerback func-
tions can be disabled or enabled. However, the dome
lamp answerback function cannot be disabled.
.
TROUBLESHOOTING HINTS
Refer to circuit diagrams GROUP-90
Refer to configuration diagrams GROUP-80
The turn-signal lamp may be defective
The dome lamp may be defective
The horn 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

SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-194
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 keyless entry system.
Q: Does the keyless entry system work normally?
YES : Go to Step 2.
NO : Refer to Inspection Procedure E-1 "Keyless entry
system does not operate P.54B-191."
STEP 2. Check the configuration function.
Q: Has the answerback function been enabled by means of
the adjustment function?
YES : Go to Step 3.
NO : Enable the answerback function by means of the
adjustment function. Verify that the answerback
functions work normally.
STEP 3. Verify trouble symptom.
Q: Which answerback function is defective?
Only the dome lamp : Go to Step 4.
Only the turn-signal lamps : Go to Step 5.
Only the horn : Go to Step 6.
Dome lamp, turn-signal lamps and horn : Replace the
ETACS-ECU. Verify that the answerback functions
work normally.
STEP 4. Verify the dome lamp.
Q: Does the dome lamp illuminate normally?
YES : Replace the ETACS-ECU. Verify that the answerback
functions work normally.
NO : Refer to Inspection Procedure K-1 "The dome lamp
do not illuminate and go out normally P.54B-359."
STEP 5. Verify the hazard warning lamp.
Q: Does the hazard warning lamp work normally?
YES : Replace the ETACS-ECU. Verify that the answerback
functions work normally.
NO : Refer to Inspection Procedure I-2 "Hazard warning
lamps do not flash when the hazard warning lamp
switch is turned on P.54B-314."

SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-202
INSPECTION PROCEDURE E-3: Keyless Entry System: Encrypted code cannot be registered.
.
CIRCUIT OPERATION
The ETACS-ECU operates the encrypted code regis-
ter mode according to the following signals:
Key reminder switch
Hazard warning lamp switch
.
TECHNICAL DESCRIPTION (COMMENT)
If the encrypted code register mode cannot be set,
the input circuits from the switches described in
"CIRCUIT OPERATION" or the ETACS-ECU may be
defective.
If the encrypted code register mode can be set but
the transmitter cannot be registered, the transmitter
or the ETACS-ECU may be defective.
.
TROUBLESHOOTING HINTS
Refer to circuit diagrams GROUP-90
Refer to configuration diagrams GROUP-80
The key reminder switch may be defective
The hazard warning lamp switch may be defec-
tive
The 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. Verify trouble symptom.
Q: Can the encrypted code register mode be set?
YES : Go to Step 3.
NO : Go to Step 2.