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PRECAUTION
FOR VEHICLES EQUIPPED WITH SRS
AIRBAG
The 1995 SUPRA is equipped with an SRS (Supplemental
Restraint System), such as the driver airbag, front passenger
airbag and seat belt pretensioners.
Failure to carry out service operations in the correct se-
quence could cause the supplemental restraint system to un-
expectedly deploy during servicing, possibly leading to a seri-
ous accident.
Further, if a mistake is made in servicing the supplemental re-
straint system, it is possible the SRS may fail to operate when
required. Before servicing (including removal or installation
of parts, inspection or replacement), be sure to read the fol-
lowing items carefully, then follow the correct procedure de-
scribed in this manual.
1. Malfunction symptoms of the supplemental restraint system
are difficult to confirm, so the diagnostic trouble codes
become the most important source of information when
troubleshooting. When troubleshooting the supplemental
restraint system, always inspect the diagnostic trouble codes
before disconnecting the battery (See page RS±41).
2. Work must be started after 90 seconds from the time the
ignition switch is turned to the LOCK position and the
negative (±) terminal cable is disconnected from the
battery.
(The supplemental restraint system is equipped with a
back±up power source so that if work is started within 90
seconds of disconnecting the negative (±) terminal cable
from the battery, the SRS may deploy.) IN±10
± INTRODUCTIONPRECAUTION
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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
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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
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5. When using electric welding, first disconnect the airbag
connector (yellow color and 2 pins) under the steering
column near the combination switch connector before
starting work.
6. When disposing of a vehicle or the steering wheel pad
alone, the airbag should be deployed using an SST
before disposal (See page RS±13). Perform the operation
in a safe place away from electrical noise.
Front Passenger Airbag Assembly
1. Always store a removed or new front passenger airbag
assembly with the airbag door facing up. Storing the air-
bag assembly with the airbag door facing down could
cause a serious accident if the airbag inflates.
2. Never measure the resistance of the airbag squib. (This
may cause the airbag deploy, which is very dangerous.)
3. Grease should not be applied to the front passenger airbag
assembly and the airbag door should not be cleaned with
detergents of any kind.
4. Store the airbag assembly where the ambient temperature
remains below 93°C (200°F), without high humidity and
away from electrical noise.
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5. When using electric welding, first disconnect the airbag
connector (yellow color and 2 pins) installed on the glove
compartment finish plate at the left side of the glove
compartment before starting work.
6. When disposing of a vehicle or the airbag assembly
alone, the airbag should be deployed using an SST
before disposal (See page RS±25).
Perform the operation in a safe place away from electri-
cal noise.
Center Airbag Sensor Assembly
1. Never reuse the center airbag sensor assembly involved in
a collision when the SRS has deployed.
2. The connectors to the center airbag sensor assembly should
be connected or disconnected with the sensor mounted on
the floor. If the connectors are connected or disconnected
while the center airbag sensor assembly is not mounted to
the floor, it could cause undesired ignition of the
supplemental restraint system.
3. Work must be started after 90 seconds from the time the
ignition switch is turned to the LOCK position and the
negative (±) terminal cable is disconnected from the battery,
even if only loosening the set bolts of the center airbag
sensor assembly. IN±14
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Wire Harness and Connector
The SRS wire harness is integrated with the cowl wire har-
ness assembly and floor 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 as shown on page RS±36.
FOR VEHICLES EQUIPPED WITH A CATALYTIC CONVERTER
CAUTION: If large amounts of unburned gasoline flow into the converter, it may overheat and create a fire
hazard. To prevent this, observe the following precautions and explain them to your customer.
1. Use only unleaded gasoline.
2. Avoid prolonged idling.
Avoid running the engine at idle speed for more than 20 minutes.
3. Avoid spark jump test.
(a) Perform spark jump test only when absolutely necessary. Perform this test as rapidly as possible.
(b) While testing, never race the engine.
4. Avoid prolonged engine compression measurement.
Engine compression tests must be done as rapidly as possible.
5. Do not run engine when fuel tank is nearly empty.
This may cause the engine to misfire and create an extra load on the converter.
6. Avoid coasting with ignition turned off and prolonged braking.
7. Do not dispose of used catalyst along with parts contaminated with gasoline or oil.
± INTRODUCTIONPRECAUTIONIN±15
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FOR VEHICLES EQUIPPED WITH
TRACTION CONTROL (TRAC) SYSTEM
When using a rear wheel two±wheel drum tester such as a
speedometer tester or chassis dynamometer, etc., or jacking
up the rear wheels and driving the wheels, always push in the
TRAC cut (ºTRAC OFFº) switch and turn the TRAC system
OFF.
CONFIRM TRAC SYSTEM IS OFF
1. Press the TRAC cut (ºTRAC OFFº) switch.
2. Check that the TRAC OFF indicator light comes on when the
TRAC system is turned off by the TRAC cut switch.
HINT: The TRAC indicator light should always operate right
after the engine is restarted.
3. Begin measurements.
4. Press the TRAC cut switch again to change the TRAC to
operative and check that the TRAC OFF indicator light goes
off.
HINT: The TRAC indicator light blinks when the TRAC system
is operative. IN±16
± INTRODUCTIONPRECAUTION
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INSPECTION AND ADJUSTMENT OF
JOINT ANGLE DURING REMOVAL AND
INSTALLATION OF PROPELLER SHAFT
When performing operations which involve the removal and
installation of the propeller shaft, always check the joint
angle. Make adjustments if necessary (See page PR±18).
± INTRODUCTIONPRECAUTIONIN±17