1991 MITSUBISHI 3000GT door lock

BODY - TroubleshootingI
42-11 ~
L/DOOR LOCK
POWER RELAY
A
I
2
Ei
J/E
51 CONNECTOR_--____-
-11
ETACS UNITC-66
____ ----____-----_-i-
I>22
II
I
I
I
I
II
I
I
IL____--- ----I
41460s3
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s
CLd
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4*310X4
Tci
It
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6*3m
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[#&iLARM
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WITH;t;Z;iALARMI
I3
5
2
ir-c-34
4--
112~3~4~5(6~7E 19 ~10~11~12~13[1f
I-
Z3:VEHICLES WITHOUT THEFT-ALARM SYSTEMs4:VEHICLES WITH THEFT-ALARM SYSTLM
N-I)(LH:DOOR
TWITCHTSB Revision

42-12
BODY - Troubleshooting
OPERATIONl When the door lock switch is set to the LOCK side (or
UNLOCK side), the LOCK side (or UNLOCK side) of the
door lock relay is turned ON and the door actuators of
alIsadoors operate.
lIf the driver seat side door (or assistant seat side door) is
opened and the driver seat side inside lock knob (or
assistant seat side inside lock knob) is locked with the key
inserted in the ignition switch, the ETACS unit grounds the
unlock side circuit of the door lock relay to unlock all doors.
This way, failure to remove the key is prevented.
NOTEThe door lock actuator contains a PTC thermister to prevent
damage caused by overheating of the motor. If the central
door lock is frequently used, the actuator may temporarily
fail to operate. If it returns to normal in a few minutes, it is
not defective.
TROUBLESHOOTING HINTS
1. One of the door lock actuators fails to operate.
l Check the door actuator which fails to operate.
2. The ignition key reminder system does not function.
l For information concerning ETACS control, refer to
P.42-55.

42-22BODY - Fuel Tank Filler Door
FUEL TANK FILLER DOOR
REMOVAL AND INSTALLATION
M42JAAS
Pre-removal and Post-installationOperationl Removal and Installation of Rear
Side Trim, Quarter Trim and Scuff Plate
(Referto GROUP 52A-Trims.)
18FOO86
18FOO69Removal steps
1. Fuel filler door
2. Fuel filler door hook
3. Release handle cover
4. Fuel filler door lock release handle
5. Fuel filler door lock release cableLA’TSB Revision

BODY - Power Window42-43
/;i
$
Diagnosis connector-Gr&nd
ETkCS ‘6R”38
Nith voltmeter-.___
1Withmulti-use tester
POWER WINDOWM42MHAH
TROUBLESHOOTING GUIDE
INPUT CHECK
Using the multi-use tester or voltmeter, check whether or not
the input signals from each switch are being input to the
ETACS unit.
(I), Connect the multi-use tester to the diagnosis check
connector located at the right side of the junction block or
connect the voltmeter between the ETACS terminal and
the ground terminal.
(2) Check if the buzzer of the multi-use tester sounds or the
needle of the voltmeter moves when each switch noted
below is operated.
If the buzzer sounds or the needle moves, the input signals
are being input to the ETACS unit, so that switch can be
considered to be functioning normally. If not, the switch or
switch input circuit is faulty. Check the switch and the
switch input circuit.
l Ignition switch
l Door switch
TROUBLESHOOTING QUICK-REFERENCE TABLE
For information concerning the locations of electrical components, refer to
P.42-51.
ProblemThe power windows do not operateNhen
the ignition switch is at the“ON” position.Probable cause
Damaged or discon-netted wiring of the
ignition switch input
circuitCheck method
If a malfunction is in-dicated as a result of
checking the input
signals, check by fol-
lowing individual part
and the circuit check
No. 2 procedures(P.42-46).Remedy
Repair the wiring
harness.
Damaged or discon-Check by following
in-Repair the wiring har-
netted wiring of thedividual part and theness, or replace thepower window relaycircuit check No. 3power window relay.
activation circuitprocedures (P.42-47).
Malfunction of the
-Replace the electron-electronic control unitic control unit.
TSB Revision

42-54
BODY - Door Handle and Latch
DOOR HANDLE AND LATCHM42MDCAREMOVAL AND INSTALLATION
18FOO42
I11.I
I18FOO41
Pre-removal and Post-installationlWO202
Door inside handle removal
Door Inside Handle Play Check (Refer to
P.42-16.)1. Door inside handle
Door outside handle and latch removal steps
2. Door key cylinder unlock switch connector
(Vehicles with theft-alarm system)
3. Door outside handle
4. Ring
5. Door lock key cylinder
6. Door latch assembly
INSPECTION
DOOR KEY CYLINDER UNLOCK SWITCH
The key cylinder unlock switch is normal if there is not
continuity between terminals 1 and 2 when the key is turned
approx. 20” clockwise or counterclockwise from the neutral
position, and there is continuity when it is turned further.
TSB Revision

BODY - Central Door Locking System42-55
Ground ETACS
,611338Nith voltmeterCENTRAL DOOR LOCKING SYSTEM M42ZDAJ
IGNITION KEY REMINDER TROUBLESHOOTING
GUIDE
INPUT CHECK
Using the multi-use tester or voltmeter, check whether or not
the input signals from each switch are being input to the
ETACS unit.
(1) Connect the multi-use tester to the diagnosis check
connector located at the right side of the junction block or
connect the voltmeter between the ETACS terminal and
the ground terminal.
(2) Check if the buzzer of the multi-use tester sounds or the
needle of the voltmeter moves when each switch noted
below is operated.
If the buzzer sounds or the needle moves,. the input signals
are being input to the ETACS unit, so that switch can be
considered to be functioning normally. If not, the switch or
switch input circuit is faulty. Check the switch and the
switch input circuit.
l Door lock actuator
l Door switch
l Key reminder switch
IGNITION KEY REMINDER TROUBLESHOOTING QUICK-REFERENCE TABLE
CENTRAL DOOR LOCKING SYSTEM
Problem
No unlock operation can be made by
pressing door lock knob after
fulfil-ment of following conditions.
l Insertion of key in ignition switch
(key reminder switch OFF)
l Opening of door(door switch ON)Probable causeCheck methodRemedy
Key reminder switchIf found defective afterCorrect harness or
input circuit shortedinput check, check circuit
bench test No. 4
rep:a~~~ key reminder
Key reminder
(P.42-59).switch shorted
Door switch inputIf found defective afterCorrect harness or
circuit brokeninput check, check circuit
replace door switch
bench test No. 5
Breaks in door switch
(P.42-60).Faulty electronic
-Replace the electronic
control unitcontrol unit
NOTE“ECU” (Electronic Control Unit) indicates the ETACS unit
1 TSB Revision

42-56BODY - Central Door Locking System
CHECKING INDIVIDUAL PART AND CIRCUIT (IGNITION KEY REMINDER SYSTEM)
1. ETACS POWER-SUPPLY AND GROUND CIRCUITS
L-
Batterv
$1,\ .
\I \/ \I
‘/1,\/2-“1
m+,2T.,l\ ,.c.i -
151
Junction block (Multi-purpose fuse)
Jumper connector
ETACS unit(ECU)
“I : Vehicles without theft-alarm system
“2: Vehicles with theft-alarm systemz1116FO314Description of operation
The battery supplies a stabilized 5V power supply to the electronic control unit, via the constant-voltage circuit
and terminal (51) directly connected to the battery. If there is an abnormal condition of the power-supply
circuit, other ETACS functions also will not operate.
Electronic control unit terminal voltage (Connection status of electronic control unit connector)
ECU terminal No. Signal
StatusTerminalvoltage
I
51Electronic control unit power supply
At all timesSystem
voltage
IChecking the ground circuit (Disconnect the connector and check the wiring harness side.)
IIII1Terminal No.Connected to/measured part
MeasurementTesterconnectionCheck conditionsStandard57”’
Electronic control unit ground
Resistance57*‘-groundAt all timesContinuity
59”)59*2-ground
NOTE
“I : Vehicles without theft-alarm system.“2: Vehicles with theft-alarm system
TSB Revision

BODY - Central Door Locking System42-57
2. DOOR LOCK ACTUATOR INPUT CIRCUIT
L
ETACS
unit (ECU)
Fusible link @
Junction block
(Multi-purpose fuse)
r7‘?r p O.BBBI
“1 : Vehicles without theft-alarm system
“2: Vehicles with theft-alarm systemU-U16(RI-U16FO316
‘IL/Description of operation
If the door is opened with the ignition key inserted and then locking is made by means of inside lock knob, the
door lock actuator is brought to the OFF position, sending H signal to the electronic control unit.
This signal operates the timer. circuit of the electronic control unit and the driving circuit operates to actuator
all the door lock actuators.
Electronic control unit terminal voltage (Connection status of electronic control unit connector)
ECU terminal No. Signal
ConditionTerminal
voltage
ll”,13”’ (LH)Door lock actuator switchDoor lock actuator switchsignalLock (OFF)5v
12”‘. 14”:’ (RH)Unlock (ON)ov
Door lock actuator switch circuit test (Disconnect the connector of the electronic control unit and
check the wiring harness side.)
ECU TerminalConnected to/No.measured partMeasurementTester
connectionCheck conditionsStandard
Door lock actuator
ll*‘, 13”’ (LH) switch signalResistance11 *‘-groundDoor lockLock (OFF)12*‘-groundactuator switchNo continuity
12”‘. 14”’ (RH)13*:-ground14*‘-groundUnlock (ON) Continuity
NOTE*1 : Vehicles without theft-alarm system
“2: Vehicles with theft-alarm systemChecking the individual part
Door lock actuator: Refer to
P.42-62.
1 TSB Revision