1991 MITSUBISHI 3000GT Service Manual

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.
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42-58BODY - Central Door Locking SystemI3. DOOR LOCK POWER RELAY ACTIVATION CIRCUIT
Fusible link 0
“I : Vehicles without theft-alarm system“2: Vehicles with theft-alarm system
Door lockactuator:
(LH)
‘d
Door lockactuator(RH)16FO329’Description of operation
If the door is opened with the ignition key inserted and then door locking is made, transistor Tr of the
electronic control unit is turned ON to operate the door lock power relay (unlock side) and the door lock
actuator is unlocked.
NOTEBefore locking the front seat passenger door, make sure that the driver door lock actuator is in the LOCK
position. If the driver door lock actuator is in the UNLOCK position, the front passenger door lock actuator
does not operate.
Electronic control unit terminal voltage (Connection status of electronic control unit connector)
ECU terminal No. Signal
ConditionTerminalvoltage
1XI, 3”’Door lock power relaySystem(unlock side) signalAt all times (except when door unlock isin operation)voltage
NOTE“I : Vehicles without theft-alarm system
“2: Vehicles with theft-alarm system
Checking the individual part
Door lock power relay: Refer to
P.42-63.
LJ
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BODY - Central Door Locking System
4. KEY REMINDER SWITCH INPUT CIRCUIT42-59

Fusiblelink@
ETACSunit(ECU)
16FO319
Junction block
(Multi-purpose fuse)
Key reminder
switch
ETACSunit(ECU)
16FO318
bDescription of operation
Insert the key in the ignition key cylinder, and the key reminder switch will be turned OFF, sending H signal to
the electronic control unit. Pulling the key out of the cylinder will turn on the key reminder switch, sending L
signal to the electronic control unit.
If there is any abnormality in the key reminder switch input circuit, abnormal key reminder buzzer will result.
Electronic control unit terminal voltage (Connection status of electronic control unit connector)
ECU terminal No. Signal
ConditionTerminal
voltage60”’
Key reminder switch signalKey is pulled outov
64”’
Key is inserted5v
Checking the key reminder switch circuit (Disconnect the connector of the electronic control unit and
check the wiring harness side.)
Terminal No.Connected to/measured partMeasurementTesterconnectionCheck conditronsStandard60”’
Key reminder swatchResistance60*‘-groundKey is pulled outContinuity
Key is insertedNo continuity
NOTE“I : Vehicles without theft-alarm system*2: Vehicles with theft-alarm system
/Checking the individual part
’Key reminder switch: Refer to GROUP 54 - Ignition Switch.
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42-60
BODY - Central Door Locking System
5. DOOR SWITCH INPUT CIRCUIT
ETACSunit(ECU)
*1 : Vehicles without theft-alarm system*2: Vehicles with theft-alarm systemPassen&r door
switchDrivergoorswitch16FO326Description of operation
When the front door is closed (the door switch is switched OFF), HIGH-level signals are sent to the electronic
control unit; when the front door is opened (the door switch is switched ON), LOW-level signals are sent to
the electronic control unit.
Electronic control unit terminal voltage (Connection status of electronic control unit connector)
’d
NOTE
Driver door and passenger doorClosed5v
“1: Vehicles without theft-alarm system
“2: Vehicles with theft-alarm system
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BODY - Central Door Locking System42-61Checking the driver door switch circuit (Disconnect the connector of the electronic control unit and
check the wiring harness side.)
and passenger
door switch
1O*2
i
NOTE“I : Vehicles without theft-alarm system
“2: Vehicles with theft-alarm systemConnected to/
measured partMeasurement -ff~~e~rionCheck conditionsStandard
Driver doorClosed
Open
Passenger
doorClosed
Open
Driver doorClosedand/or pas-
senger doorNo continuity
Continuity
No continuity
Continuity
No continuity
Driver door
Openand passen-
ger doorContinuity
Check the individual part
Door switch: Refer to
P.42-41.
id
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42-62BODY - Central Door Locking System
REMOVAL AND INSTALLATION16FO196
Door lock actuator removal
Door trim and waterproof film (Refer toP.42-41.)Do&
latch assembly (Refer to P.42-54.)
1. Door lock actuator
18FO205Door lock switch removal
Door trim (Refer to P.42-41.)
2. Door lock switch18FOO52

view A16FOO51INSPECTION
DOOR LOCK ACTUATOR
(1) Place the rod in the LOCK position, apply the battery power
to the terminal
L(3) for driver’s side or (1) for passenger’s
side1 and check to see that when the terminal [(l) for
driver’s side or (3) for passenger’s side] is grounded, the rod
moves to the UNLOCK position.
(2) Then place the rod in the UNLOCK position, apply the
battery power to the terminal [(I) for driver’s side or (3) for
passenger’s side], and check to see that when the terminal
[(3) for driver’s side or (1) for passenger’s side] is grounded,
the rod moves to the LOCK position.
(3) Check to ensure that when the rod is placed in the UNLOCK
position, there is acontinuity between the terminals (2) and
(4). and that when the rod is placed in the LOCK position,
there is no continuity.
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BODY - Central Door Lockina Svstem42-63
:Vehicles with power window>
Dower window main switch side
Power window sub switch side
18FO107DOOR LOCK SWITCH
Check for continuity in accordance to the following connection
table.
Power window main switch side
LOCKIo--+--Q I
UNLOCKII c-+---oL
NOTEO-O indicates that there is continuity between the terminals
Power window sub switch side
1 LOCKIo---+-o I
OFFII
I
1 UNLOCKI c--+--
NOTEO-O indicates that there is continuity between the terminals.

LOCK00
OFF
UNLOCK00
NOTEO-O indicates that there is continuity between the terminals.
DOOR LOCK RELAY
(1) Remove the knee protector assembly:
(Refer to GROUP 52A
- Instrument Panel.)
(2) Remove the door lock relay from indoor relay box.
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42-64BODY - Central Door Locking System
(3) Check for continuity between terminals under the condi-
tions described below.
I.IIIIII
NOTE(I )O-O indicates that there is continuity between the terminals.(2)O---O indicates terminals to which battery voltage is applied.
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