steering wheel TOYOTA SUPRA 1995 Service Repair Manual

INSPECTION PROCEDURE
Shift the shift lever to N position.
Jack up one of the rear wheels.
Connect the Check Harness A
(See page EG±404)
Disconnect power steering ECU connector
and cruise control ECU connector.
Turn ignition switch ON.
Measure voltage between terminal SP1 of ECM
connector and body ground when the wheel is
turned slowly.
Check voltage between terminal SP1 of ECM connector and body ground.
Voltage is generated intermittently.
Check and replace ECM.
Repair or replace harness or connector be-
tween ECM and telltale light RH.
Check operation of odometer and trip meter (telltale light RH (See page
BR±48))
AT1±67± AT340E (2JZ±GE) AUTOMATIC TRANSMISSIONTROUBLESHOOTING

WIRING DIAGRAM
Check voltage between terminal SP1 of ECM connector and body ground.
Check operation of odometer and trip meter (telltale light RH
(See page BE±48)).
Check and replace ECM.
Repair or replace harness or connector between
ECM and telltale light RH.
Go to
1. Shift the shift lever to N position
2. Jack up one of the rear wheels.
3. Connect the Check Harness A.
See page EG±510)
(1) Disconnect power steering ECU connector
and cruise control ECU connector.
(5) Turn ignition switch ON.
Measure voltage between terminal SP1 of ECM
connector and body ground when the wheel is
turned slowly.
Voltage is generated intermittently.
INSPECTION PROCEDURE
± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTINGAT2±73

PRECAUTION
Take care to observe the doing precautions when performing inspections or removal and replacement of
body electrical related parts.
HEADLIGHT SYSTEM
wHalogen bulbs have pressurized gas inside and require special handling. They can burst if scratched or
dropped. Hold a bulb only by its plastic or metal case.
Don't touch the glass part of a bulb with bare hands.
SRS (SUPPLEMENTAL RESTRAINT SYSTEM)
wWork must be started after 90 seconds from the time the ignition switch is turned to the ºLOCKº position
and the negative (±) terminal cable is disconnected from the battery.
wWhen disconnecting any of the connectors in the SRS, be sure to lock the ignition switch and disconnect
the negative (±) terminal cable from the battery first. Since the connectors are twin lock type connectors,
disconnect the connectors only after releasing the first stage lock.
wWhen connecting SRS connectors, be sure to lock them securely. (If the connectors are not locked
securely, the system may not operate when needed.)
wAlways store the steering wheel pad with the pad surface facing upward. (Storing the pad with its metallic
surface up may lead to a serious accident if the SRS inflates for some reason.)
wWhen installing the spiral cable, be sure the vehicle is in the straight ahead condition and confirm that the
spiral cable is in the neutral position when it is installed.
wINFORMATION LABELS (NOTICE) are attached to the periphery of the SRS components. Follow the
NOTICE.
AUDIO SYSTEM
wIf the negative (±) terminal cable is disconnected from the battery, the preset AM, FM 1 and FM 2 stations
stored in memory are erased, so be sure to note the stations and reset them after the battery terminal is
reconnected.
wIf the negative (±) terminal cable is disconnected from the battery, the ºANTI±THEFT SYSTEMº will operate
when the cable is reconnected, but the radio, tape player and CD player will not operate. Be sure to input
the correct ID number so that the radio, tape player and CD player can be operated again.
MOBILE COMMUNICATION SYSTEM
wIf the vehicle is equipped with a mobile communication system, refer to precautions in the IN section. BE±2
± BODY ELECTRICAL SYSTEMPRECAUTION

control switch (See page IN±30).
Switch position
Neutral
RES/ACC
SET/COAST
CANCEL
Replace cruise control switch.
Measure resistance between terminals 3 and 4 of
control switch connector when control switch is
operated.
Repair or replace harness or connector.
Check and replace ECU.
When diagnostic trouble code 34 is displayed, carefully
check that resistance is always 8 in neutral position,
particularly when switching between RES/ACC and
SET/COAST.
(1) Remove steering wheel center pad.
(2) Disconnect control switch connector (See
page RS Section).
Check control switch.
Check for open and short in harness and connector between ECU and
Resistance
± BODY ELECTRICAL SYSTEMCRUISE CONTROL SYSTEMBE±181

Check harness and connector between cruise control ECU and main
switch, main switch and body ground. (See page IN±30).
Proceed to next circuit inspection shown on matrix
chart (See page
BE±170).
(1) Turn ignition switch ON.
(2) Measure voltage between terminal CMS and
GND of cruise control ECU connector when main
switch is held on and off.
Remove cruise control ECU with connectors still con-
nected.
Main switch
Repair or replace harness or connector.
Check and replace cruise control ECU.
Voltage
Check continuity between terminals 2 and 4 of cruise
control switch connector when main switch is held on
and off.
(1) Remove steering wheel center pad (See page
RS Section).
(2) Disconnect cruise control switch connector.
Terminals
Main switch
OFF
Hold ON
Continuity
Check main switch.
Repair or replace harness or connector.
Check and replace cruise control ECU.
Replace control switch.
Check voltage between terminal CMS and GND of cruise control ECU
connector
BE±198± BODY ELECTRICAL SYSTEMCRUISE CONTROL SYSTEM

SRS (Supplemental Restraint System)
The 1995 SUPRA is equipped with an SRS, such as the driver airbag and front passenger airbag assembly.
Failure to carry out service operations in the correct sequence could cause the SRS to deploy, possibly
leading to a serious accident.
When removing or installing of airbag parts and the yellow wire harness and connector for the airbag is
necessary, refer to the precautionary notices in the RS section before performing the operation.
wWork must be started after 90 seconds from the time the ignition switch is set to the LOCK position
and the negative (±) terminal cable is disconnected from the battery.
(The SRS is equipped with a back±up power source so that if work is started within 90 seconds of
disconnecting the negative (±) terminal cable of the battery, the SRS may deploy.)
wTo avoid erasing the memory of each memory system, never use a back±up power supply from
outside the vehicle.
wBefore repairs, remove the airbag sensors if shocks are likely to be applied to the sensors during
repairs.
wThe front airbag sensor set bolt has been anti±rust treated. When the sensor is removed, always
replace the set bolt with a new one.
wIf the front airbag sensors, center airbag sensor assembly, steering wheel pad or front passenger
airbag assembly have been dropped, or if there are cracks, dents or other defects in the case, bracket
or connector, replace them with new ones.
wNever use SRS parts from another vehicle. When replacing parts, replace them with new parts.
wDo not expose the front airbag sensors, center airbag sensor assembly, steering wheel pad or front
passenger airbag assembly directly to hot air or flames.
wThe SRS wire harness is integrated with the cowl wire harness assembly. The wires for the SRS wire
harness are encased in a yellow corrugated tube. All the connectors for the system are also a standard
yellow color. If the SRS wire harness becomes disconnected or the connector becomes broken due
to an accident, etc., repair or replace it. (See RS section)
wThe steering wheel must be fitted correctly to the steering column with the spiral cable at the neutral
position; otherwise, cable disconnection and other troubles may result. Refer to RS section of this
manual concerning correct steering wheel installation.
wWhen removing or handling the steering wheel pad or front passenger airbag assembly, it should be
placed with their top surface facing up. In this case, the twin±lock type connector lock lever should
be in the locked state and care should be taken to place it so the connector will not be damaged.
(Storing the pad with its metallic surface up, the front passenger airbag assembly with the airbag door
facing down may lead to a serious accident if the airbag inflates for some reason.)
wGrease should not be applied to the steering wheel pad or the front passenger airbag assembly, and
they should not be cleaned with detergents of any kind.
wStore the steering wheel pad or the front passenger airbag assembly where the ambient temperature
remains below 93°C (200°F), without high humidity and away from electrical noise.
wInformation labels are attached to the periphery of the SRS components. Follow the notices.
wWhen the ignition switch is at ACC or ON and the SRS warning light remains on, the center airbag
sensor assembly has detected a malfunction code. (See RS section)
± BODYGENERAL INFORMATIONBO±5

INSTRUMENT PANEL REMOVAL
1. REMOVE STEERING WHEEL
(See page SR±14)
CAUTION:
wWhen storing the wheel pad, keep the upper surface of
the pad facing upward.
wNever disassemble the steering wheel pad.
2. REMOVE THESE PARTS:
HINT: Tape a screwdriver tip before use.
(a) Front pillar garnishes
(b) Assist grip
(c) Foot rest
(d) Front door scuff inside plates
(e) Steering column cover
(f) Console upper panel
(g) Parking brake hole cover
(h) Console box
(i) Finish panel
(j) Finish lower LH panel
(k) Cluster finish panel BO±48
± BODYINSTRUMENT PANEL

SERVICE SPECIFICATIONS
TORQUE SPECIFICATIONS
 Part tightened NVm kgfVcm ftVlbf
 FRONT BUMPER ±± ±± ±±
  Reinforcement x Body 5.9 60 52 in.Vlbf
  Front bumper cover x Body 5.9 60 52 in.Vlbf REAR BUMPER ±± ±± ±± 
  Reinforcement x Body
 
 42
 
 430
 
 31
  Rear bumper cover x Body 5.9 60 52 in.Vlbf
 HOOD ±± ±± ±±
  Hood hinge x Hood 13 130 9.4
  Hood lock x Body 8.8 90 78 in.Vlbf
 FRONT DOOR ±± ±± ±±  Door hinge x Body 52 530 38 
  Door hinge x Door panel
 
 25
 
 260
 
 19
  Door lock x Door panel 5.4 55 48 in.Vlbf
  Window regulator x Door panel 7.8 80 69 in.Vlbf
  Window guide lower plate x Door panel 5.9 60 52 in.Vlbf
  Door window upper stop x Door panel 13 130 9.4
 BACK DOOR ±± ±± ±±  Back door hinge x Body 21 210 15 
  Back door hinge x Back door
 
 13
 
 130
 
 9.4
  Door lock x Body 19 195 14
  Door lock striker x Body 13 130 9.4
  Back door damper stay x Body 5.9 60 52 in.Vlbf
  Back door damper stay x Back door 7.8 80 69 in.Vlbf
 WIPER AND WASHER ±± ±± ±± Front Wiper ±± ±± ±± 
  Wiper arm x Wiper link
 
 22
 
 225
 
 16
 Rear Wiper ±± ±± ±±
  Wiper arm x Wiper motor 11 11 0 8.0
 INSTRUMENT PANEL ±± ±± ±±
  Steering column x Instrument panel reinforcement 25 260 19
  Front passenger airbag assembly x Instrument panel reinforcement 21 210 15  Front passenger airbag assembly x Instrument panel 8.8 90 78 in.Vlbf 
  Steering wheel x Steering column 
 35 
 360 
 26
  Steering wheel pad x Steering wheel 7.1 72 62 in.Vlbf
± BODYSERVICE SPECIFICATIONSBO±63

When the negative (±) terminal cable is disconnected from
the battery, memory of the clock and audio systems will be
cancelled. So before starting work, make a record of the con-
tents memorized by the audio memory system. When work
is finished, reset the audio systems as before and adjust the
clock.
This vehicle has power tilt and power telescopic steering,
power seat, power outside rear view mirror and power shoul-
der belt anchorage, which are all equipped with memory
function, it is not possible to make a record of the memory
contents. So when the work is finished, therefore it will be
necessary to explain this fact to the customer, and ask the
customer to adjust the features and reset the memory.
To avoid erasing the memory of each memory system, never
use a back±up power supply from outside the vehicle.
3. Even in cases of a minor collision where the SRS does not
deploy, the steering wheel pad, front passenger airbag
assembly and front airbag sensors should be inspected (See
pages RS±10, 20, 30).
4. Never use SRS parts from another vehicle. When replacing
parts, replace them with new parts.
5. Before repairs, remove the airbag sensors if shocks are likely
to be applied to the sensors during repairs.
6. Never disassemble and repair the front airbag sensors,
center airbag sensor assembly, steering wheel pad or front
passenger airbag assembly in order to reuse it.
7. If the front airbag sensors, center airbag sensor assembly,
steering wheel pad, front passenger airbag assembly or seat
belt pretensioners have been dropped, or if there are cracks,
dents or other defects in the case, bracket or connector,
replace them with new ones.
8. Do not expose the front airbag sensors, center airbag sensor
assembly, steering wheel pad, front passenger airbag
assembly or seat belt pretensioners directly to hot air or
flames.
9. Use a volt/ohmmeter with high impedance (10 k
/V
minimum) for troubleshooting of the electrical circuit.
10. Information labels are attached to the periphery of the SRS
components. Follow the instructions on the notices.
11. After work on the supplemental restraint system is
completed, perform the SRS warning light check (See page
RS±44).
± INTRODUCTIONPRECAUTIONIN±11

Front Airbag Sensor
1. Never reuse the front airbag sensors involved in a collision
that activated the supplemental restraint system. (Replace
both left and right airbag sensors.)
2. Install the front airbag sensor with the arrow on the sensor
facing toward the front of the vehicle.
3. The front airbag sensor set bolts have been anti±rust treated.
When the sensor is removed, always replace the set bolts
with new ones.
4. The front airbag sensor is equipped with an electrical
connection check mechanism. Be sure to lock this
mechanism securely when connecting the connector. If the
connector is not securely locked, a malfunction code will be
detected by the diagnosis system (See page RS±7).
Spiral Cable (in Combination Switch)
The steering wheel must be fitted correctly to the steering col-
umn with the spiral cable at the neutral position, otherwise
cable disconnection and other troubles may result. Refer to
page SR±14 of this manual concerning correct steering
wheel installation.
Steering Wheel Pad (with Airbag)
1. When removing the steering wheel pad or handling a new
steering wheel pad, it should be placed with the pad top
surface facing up.
In this case, the twin±lock type connector lock lever should
be in the locked state and care should be taken to place it so
the connector will not be damaged. In addition do not store
a steering wheel pad on top of another one. Storing the pad
with its metallic surface up may lead to a serious accident if
the airbag inflates for some reason.
2. Never measure the resistance of the airbag squib. (This
may cause the airbag to deploy, which is very
dangerous.)
3. Grease should not be applied to the steering wheel pad and
the pad should not be cleaned with detergents of any kind.
4. Store the steering wheel pad where the ambient temperature
remains below 93°C (200°F), without high humidity and
away from electrical noise. IN±12
± INTRODUCTIONPRECAUTION