ignition MITSUBISHI 3000GT 1991 Service Manual

51-30
EXTERIOR - Windshield Wiper and Washer
4. WIPER RELAY ACTIVATION CIRCUIT
Columnswitch
ETACS untt(ECU) t,
lgnttton switch (ACC)I
Junction block(Multi-purpose fuse)0.85L
*11 $0J\
i?+”
coii
aIt
0.85L-W dA
*’II16FO322
Wiper
motor
Ei
123 4
Operation Description
With the wiper switch at the “INT” position, switch ON the transistor (by the intermittent activation signal
from the electronic control unit) in order to activate the wiper relay.
Electronic Control Unit Terminal Voltage (Connection Status of Electronic Control Unit Connector)
ECUterminal No.SignalStatusTerminal
voltage
4”’
6*2Wiper relay signal)N$Fy switch
I,Ignition switch “OFF”
Ignition switch “ACC”ov
System
voltage
NOTE“I : Vehicles without theft-alarm system
“2: Vehicles with theft-alarm system
Checking Individual Part
Wiper relay: Refer to
P.51-34.
Lj 1
I
I
I
I
‘d ’1
I
\ ~
1 TSB Revision

EXTERIOR - Windshield WiDer and Washer51-315. WASHER SWITCH INPUT CIRCUIT
lgnitlon swatch (ACC)
Columnswitch
ETACS unit(ECU)*,
-7-l
Junction block15~ @ (Multi-purpose fuse)
ON-time detec-\I\I1a
“I : Vehicles without theft-alarm system
“2: Vehicles with theft-alarm system16FO323
Operation Description
While the washer switch is ON, HIGH-level signals are sent to the washer switch ON-time detection circuit
simultaneous with the activation of the washer motor, thus causing the transistor to be switched ON and the
wipers to be activated for a certain fixed time.
Electronic Control Unit Terminal Voltage (Connection Status of Electronic Control Unit Connector)
ECUterminal No.58”’
60*2Signal
Washer switch signal
Status
Ignition switch
“ACC”Washer switch “OFF”Washer switch “ON“
Terminal
voltageov
System
voltage
NOTE*I : Vehicles without theft-alarm system
“2: Vehicles with theft-alarm systemChecking Individual Part
Washer switch: Refer to
P.51-33
1 TSB Revision

INTERIOR - Troubleshootinn52A-5OPERATION
l If the driver fastens the seat belt with the
ignition switch placed in the “ON” position, the
seat belt switch in the seat belt buckle is turned
“ON” to operate the seat belt solenoid in the
retractor.
lThis will reduce the seat belt rewinding torque
to minimize a sense of oppression given by the
belt.
lOwing to the timer function of the ETACS unit,
the seat belt solenoid is kept in operation for 30
seconds after turning off the ignition switch,
with due consideration to elimination of the
sudden rise in a sense of oppression caused by
the belt immediately after the ignition switch is
turned off.
COMPONENT LOCATION
ETACS unitNameSymbolA19FO134TROUBLESHOOTING HINTS
The seat belt solenoid does not function
(I) The power window does not operate as well.
lCheck the ETACS unit. (Refer to GROUP 42-Power Window.)
(2) The power window operates.
l Check dedicated fuse No. 1 and 19.
(3) Some of the tension reducers do not operates
l Check the inoperative seat belt switch.
l Check the inoperative seat belt solenoid.
I
1 TSB Revision

INTERIOR - Troubleshooting52A-7OPERATION
Key-reminder warning
L0 Battery voltage is always supplied, through
fusible link No. 6 to the key-reminder switch.
l When the driver’s seat is opened while the
ignition key is still in the key cylinder, the door
switch is switched ON, electricity flows to
fusible link No. 6, the key-reminder switch, the
buzzer, the door switch, and ground, and the
buzzer sounds.
Seat belt warning
lBattery voltage is applied, through fuse No. 11
to the ETACS unit when the ignition key is at the
“ON” position.
l Electricity flows to fusible link No. 6, the seat
belt warning light, the ETACS unit, and ground,
and the seat belt warning light flashes for
approx. 6 seconds.
lIf the driver does not buckle the seat belt, the
seat belt switch is switched ON, electricity
flows to fusible link No. 6, the key-reminder
switch, the buzzer, the seat belt switch, the
ETACS unit, and ground, and the buzzer sounds
for approx. 6 seconds.
lWhen the driver buckles the seat belt, the seat
belt switch is switched OFF and the buzzer
stops.
COMPONENT LOCATION
Name1 Symbol (
ETACS unitIA t19FO134TROUBLESHOOTING HINTS
Key-reminder warning
The key-reminder warning doesn’t sound.
(I) The seat belt warning function is OK.
l Check the door switch.
(2) The seat belt warning also doesn’t function.
l Check the buzzer.
Seat belt warning
1. The seat belt warning doesn’t function.
(I) The seat belt warning light flashes.
l Check the seat belt switch.
(2) The seat belt warning light also does not
function (and the key-reminder warning also
does not function).
l Check the key-reminder switch.
2. The buzzer doesn’t stop even though the driv-
er’s seat belt has been buckled.
l Check the seat belt switch.
3. The seat belt warning light doesn’t flashes (but
the buzzer sounds).
l Check the light bulb.
NOTEFor the inspection of the ETACS unit, refer to
P.52A-25.16FO35
1 TSB Revision

INTERIOR - Seat Belt52A-25
Diagnosis connector”LJ’2OFOOl
GW161,338
With voltmeter___.-- -- ~~--~_. ___-- ..-.. .-.-
With multi-use tester
SEAT BELTM52UGEH
TROUBLESHOOTING GUIDE
INPUT CHECKUsing 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 Ignition switch
II
TROUBLESHOOTING QUICK-REFERENCE TABLE
Problem
The warning light does notflash and the warning buzzer
also does not sound.
Probable cause
Damaged or discon-nected wiring of the
ignition switch input
circuit
Damaged or discon-nected wiring of theseat belt warning
and buzzer activa-
tion circuit
Blown fuse
Malfunction of theelectronic control unitCheck method
If a malfunction is in-
dicated as a result of
checking the inputsignals, check by follow-
ing individual part and
the circuit check No. 1
procedures (P.52A-27).
Check by following in-dividual part and the
circuit check No. 2
procedures (P.52A-28).
-
Repair the wiringharness.
Replace the fuse.
Replace the electron-
ic control unit.
TSB Revision

INTERIOR - Seat Belt52A-27
CHECKING INDIVIDUAL PART AND CIRCUIT
IGNITION SWITCH INPUT CIRCUITBattery
Fusible link
2oB-y~~/l,l(l,l,,~~ !jw u03w
30AJunction block
*I : Vehicles without theft-alarm system“2: Vehicles wtth theft-alarm system16FO35.3
It/Description of operationA condition for operation of this system is the sending of HIGH-level signals to the electronic control unit
when the ignition switch is switched to the “ON” position.
Electronic control unit terminal voltage (Disconnect the connector of the electronic control unit andcheck the wiring harness side.)
IECU terminal No. SignalCondition-1 ~StandardI
52Ignition switch “ON”Ignition switchOFF
ONov
System
voltageChecking the ground circuit (Disconnect the connector and check the wiring harness side.)
Terminal No.Connected to/measured part
57,’Electronic control unit ground
59*2
NOTE
*I : Vehicles without theft-alarm system
“2: Vehicles with theft-alarm systemMeasurementTester
connectronCheck conditionsStandard
Resistance
57*‘-groundAt all timesContinuity
59*.‘-groundChecking the individual part
Ignition switch: Refer to GROUP 54
- Ignition Switch.
1 TSB Revision

52A-28INTERIOR - Seat Belt2. SEAT BELT WARNING LIGHT AND BUZZER ACTIVATION CIRCUIT
Fusible link @
Junctron block(Multr-purpose fuse)
ETACS unit (ECU)Description of operation
Place the ignition switch in the ON position, and the transistor will be turned on, blinking the warning light and
sounding the buzzer four times. However, the warning buzzer will not sound unless the key-reminder switch
and seat belt switch are in the ON position.
Electronic control unit terminal voltage (Disconnect the connector of the electronic control unit andcheck the wiring harness side.)
IIIIIECU terminal No. Signal
ConditionTerminal
voltageI\!
Warning light signalAt all timesSystem
6*1voltage
Warning buzzer signal
Key-reminder switch or seat belt switch “OFF”ov8*2
Key-reminder switch and seat belt switch “ON”System
voltage
NOTE“1. Vehicles without theft-alarm system
“2: Vehicles with theft-alarm systemChecking the individual part
Key-reminder switch: Refer to GROUP 54
- Ignition Switch.dSeat belt switch: Refer to
P.5?A-30.
1 TSB Revision

52B-2SUPPLEMENTAL RESTRAINT SYSTEM (SRS) - General informationGENERAL INFORMATION
INTRODUCTIONThe Supplemental Restraint System (SRS) is de-
signed to supplement the driver’s seat belt to help
reduce the risk or severity of injury to the driver by
activating and deploying a driver’s-side air bag in
certain frontal collisions.
The SRS consists of: left front and right front impact
sensors located, one each, on the right and left front
upper frame lowers; an air bag module located in
the center of the steering wheel, which contains the
folded air bag and an inflator unit; the SRS diagnosis
unit located under the rear console assembly, which
monitors the system, and which contains a safing
impact sensor; an SRS warning light located on the
instrument panel, which indicates the operational
status of the SRS; a clock spring interconnection
located within the steering column; system wiring
and wiring connectors; and a knee bolster located
SRS warning light
M52BAAFunder the steering column.
The SRS is designed so that the air bag will deploy
when the safing sensor, plus either or both of the
left front and right front impact sensors simul-
taneously activate while the ignition switches
“ON”.
That is designed to occur in frontal or near-frontal
impacts of moderate to severe force.
Only authorized service personnel should do work
on or around the SRS components. Those service
personnel should read this manual carefully before
starting any such work. Extreme care must be used
whenservicing the SRS, to avoid injury to the
service personnel (by inadvertent deployment of the
air bag) or the driver (by rendering the SRS inopera-
tive).
SELF-DIAGNOSIS/SRS WARNING LIGHT FUNCTION
The diagnosis unit monitors the SRS system and stores data
concerning any detected faults in the system. When the
ignition key is in “ON” or “START” position, the SRS warning
light should illuminate for about 7 seconds and then turn off.
That indicates that the SRS system is in operational order. If the
SRS warning light does any of the following, immediate
inspection by an authorized dealer is needed.
(1) The SRS warning light does not illuminate as described
above.
(2) The SRS warning light stays on for more than 7 seconds.
(3) The SRS warning light illuminates while driving.
If a vehicle’s SRS warning light is in any of these three
conditions when brought in for inspection, the SRS system
must be inspected, diagnosed and serviced
In accordance wrth
this manual.
TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS) - General lnform=*ion52B-5
r1.c
L
E.
,
iiCAUTION: SRS diagnosis unit
This unit cannot be repaired.
If defective, remove and replace entire unit per
service manual instructions.
Do not disassemble or tamper.
See service manual for handling and storage
instructions.Driver’s air bag information
This vehicle
ha% an air bag which will supple-
ment the driver’s seatbelt in certain frontal
collisions. The air bag is not a substitute for the
driver’s seatbelt in any type of collision. The
driver, and all other occupants, should wear
seatbelts at all times.
WARNING!
If the “SRS” warning light does not come.on
for about 7 seconds when ignition key is turned
to “ON” or engine is started, or if it stays on
while driving, drive the vehicle to your nearest
authorized dealer right away. Also do so if
vehicle’s front end is damaged or if air bag has
deployed.
The air bag system must be inspected by an
authorized dealer ten years after vehicle manu-
facture date shown on certification label lo-
cated on left front door-latch post or door
frame.Read “SRS” section of your owner’s manual
before driving, for important information, about
Dperation, service and disposal of the air bag
svstem.
Do no drop: keep dry.
Failure to follow instructions could render air
bag inoperative and result in driver injury.
F. CAUTION: SRS
Before replacing steering wheel, read service
manual, center front wheels
ahd align SRS
clock spring neutral marks.
Failure to do so may render SRS system
inoperative, risking serious driver injury.
I.
J.WARNING: SRS
This air bag module cannot be repaired. Do not
disassemble or tamper.
Do not perform diagnosis. Do not touch with
electrical test equipment or probes. Refer to
service manual for further instructions, and for
special handling, storage and disposal proce-
dures.
Tampering or mishandling can result in injury.
Danger! Poison. Keep out of the reach of
children.
Contains sodium acid and potassium nitrate
contents are poisonous and extremely flamm-
able. Contact with acid, water, or heavy metals
may produce harmful and irritating gases or
explosive compounds. Do not dismantle, in-
cinerate or bring into contact with electricity or
store at temperatures exceeding
(93.3”C)
200°F.Fast aid: If contents are swallowed induce
vomiting. For eye contact flush eye with water
for 15 minutes. If gases from acid or water
contact are inhaled, seek fresh air. In every
case, get prompt medical attention.
For additional information, see material safety
data sheet (MSDS) for this product.
CAUTION: SRS clock spring
This is not a repairable part. Do not disassem-
ble or tamper.
If defective, remove and replace entire unit per
service manual instructions.
Before replacement, read service manual, cen-
ter front wheels and align neutral marks.
Failure to
foHow instructions may render SRS
system inoperative, risking serious driver in-
jury.CAUTION: SRS
Before removal of steering gearbox, read ser-
vice manual, center front wheels and remove
ignition key.
Failure to do so may damage SRS clock spring
and render SRS system inoperative, risking
serious driver injury.
TSB Revision

52B-6SUPPLEMENTAL RESTRAINT SYSTEM (SRS) - General Information
;RS SCHEMATIC
STARTER RELAYIGNITION SWITCH MIT
I
‘dIGNITION SWITCH
IMulti
-purpose fuses
Connector
lock switch
----
r
1
UNLOCKiM/T -AA
IWarning light
malfunction
detection circuitICrank signal detection circuit
Connector lock
detection circuit
Safing
impact
sensor
1
N
i-Multi-use ,
Tester
interface
circuit
Self-diagnosis
check connector
(For Multi-use
Tester)
19FO141Front impact
sensor
(L.H.)Clock spring
Front impact
sensor (R.H.)IP-l-Air bag
module
TSB Revision