TOYOTA SUPRA 1995 Service Repair Manual

When the vehicle is involved in a frontal collision in the
hatched area (Fig. 1) and the shock is larger than a predeter-
mined level, the SRS is activated automatically. A safing sen-
sor is designed to go on at a smaller deceleration rate than
the front and center airbag sensors. As illustrated in Fig. 2,
ignition is caused when current flows to the squib, which hap-
pens when a safing sensor and a front airbag sensor and/or
the center airbag sensor go on simultaneously. When a de-
celeration force acts on the sensors, two squibs in the driver
airbag and front passenger airbag ignite and generate gas.
The gas discharging into the driver and front passenger air-
bags rapidly increases the pressure inside the bags, break-
ing open the steering wheel pad and instrument panel door.
Bag inflation then ends, and the bags deflate as the gas is
discharged through discharge holes at the bag's rear or side. RS±8
± SUPPLEMENTAL RESTRAINT SYSTEMOPERATION

PREPARATION
SST (SPECIAL SERVICE TOOLS)
SRS Airbag Deployment Tool
Diagnosis Check Wire
Puller C SetSteering wheel
RECOMMENDED TOOLS
Torx Socket T30
Torx Socket T40
TOYOTA Electrical Tester Set
Steering wheel pad
Center airbag sensor assembly
EQUIPMENT
 
 Torque wrench 
 
 
 Bolt: Length: 35 mm (1.38 in.) Pitch: 1.0 mm (0.039 in.)
Diam.: 6.0 mm (0.236 in.) 
 Airbag disposal
 
 
Tire Width: 185 mm (7.28 in.) Inner diam.: 360mm (14.17 in.) 
 
Airbag disposal
 
 
Tire with disc wheel Width: 185 mm (7.28 in.)
Inner diam.: 360 mm (14.17 in.) 
 
Airbag disposal
 
 
Vinyl bag 
 
Airbag disposal
± SUPPLEMENTAL RESTRAINT SYSTEMPREPARATIONRS±9

STEERING WHEEL PAD AND
SPIRAL CABLE
INSPECTION ITEMS
1. VEHICLES NOT INVOLVED IN A COLLISION
(a) Do a diagnostic system check. (See page RS±44)
(b) Do a visual check which includes the following items with the
steering wheel pad (with airbag) installed in the vehicle.
wCheck for cuts, minute cracks or marked discoloration
of the steering wheel pad top surface and grooved
portion.
2. VEHICLES INVOLVED IN A COLLISION
IF THE AIRBAG IS NOT DEPLOYED
(a) Do a diagnostic system check. (See page RS±44)
(b) Do a visual check which includes the following items with the
steering wheel pad (with airbag) removed from the vehicle.
wCheck for cuts and cracks in, or marked discoloration of
the steering wheel pad top surface and its grooved
portion.
wCheck for cuts and cracks in wire harnesses, and for
chipping in connectors.
wCheck for deformation of the horn button contact plate
of the steering wheel.
HINT:
wIf the horn button contact plate of the steering wheel is
deformed, never repair it. Always replace the steering
wheel assembly with a new one.
wThere should be no interference between the steering
wheel pad and the steering wheel, and the clearance
should be uniform all the way around when the new
steering wheel pad is installed on the steering wheel.
CAUTION: For removal and installation of the steering
wheel pad, see page RS±12, ºSTEERING WHEEL PAD
AND SPIRAL CABLE REMOVAL AND INSTALLATIONº
and be sure to follow the correct procedure. RS±10
± SUPPLEMENTAL RESTRAINT SYSTEMSTEERING WHEEL PAD AND SPIRAL CABLE

IF THE AIRBAG IS DEPLOYED
(a) Do a diagnostic system check. (See page RS±44)
(b) Do a visual check which includes the following items with the
steering wheel pad (with airbag) removed from the vehicle.
wCheck for deformation of the horn button contact plate
of the steering wheel.
wCheck for damage to the spiral cable connector and wire
harness.
HINT:
wIf the horn button contact plate of the steering wheel is
deformed, never repair it. Always replace the steering
wheel assembly with a new one.
wThere should be no interference between the steering
wheel pad and the steering wheel, and the clearance
should be uniform all the way around when the new
steering wheel pad is installed on the steering wheel.
REPLACEMENT REQUIREMENTS
In the following cases, replace the steering wheel pad, steer-
ing wheel or spiral cable.
wIf the airbag has been deployed.
wIf the steering wheel pad or spiral cable has been found
to be faulty in troubleshooting.
wIf the steering wheel pad, steering wheel or spiral cable
has been found to be faulty during the check in items
1±(b) or 2±(b).
wIf the steering wheel pad has been dropped.
CAUTION: For replacement of the steering wheel pad,
see page RS±12, ºSTEERING WHEEL PAD AND SPIRAL
CABLE REMOVAL AND INSTALLATIONº and be sure to
follow the correct procedure.
± SUPPLEMENTAL RESTRAINT SYSTEMSTEERING WHEEL PAD AND SPIRAL CABLERS±11

COMPONENTS
STEERING WHEEL PAD AND SPIRAL
CABLE REMOVAL AND INSTALLATION
(See SR section) RS±12
± SUPPLEMENTAL RESTRAINT SYSTEMSTEERING WHEEL PAD AND SPIRAL CABLE

STEERING WHEEL PAD (WITH AIRBAG)
DISPOSAL
When scrapping vehicles equipped with an SRS or disposing
of a steering wheel pad (with airbag), always first deploy the
airbag in accordance with the procedure described below.
If any abnormality occurs with the airbag deployment, con-
tact the SERVICE DEPT. of TOYOTA MOTOR SALES,
U.S.A., INC..
Never dispose of a steering wheel pad which has an un-
deployed airbag.
When disposing of a steering wheel pad with an airbag
deployed in a collision, follow the same procedure given un-
der ºWhen scrapping vehicle, step 4. DISPOSAL OF STEER-
ING WHEEL PAD (WITH AIRBAG)º.
PRECAUTIONS FOR AIRBAG DEPLOYMENT
wThe airbag produces a sizeable exploding sound when
it deploys, so do the operation out±of±doors and where
it will not create a nuisance to nearby residents.
wWhen deploying the airbag, always use the specified
SST: SRS AIRBAG DEPLOYMENT TOOL (SST
09082±00700).
Carry out the operation in a place away from electrical
noise.
wWhen deploying an airbag, do it from at least 10 m (33
ft) away from the steering wheel pad.
wThe steering wheel pad is very hot when the airbag is
deployed, so leave it alone for at least 30 minutes after
deployment.
wUse gloves and safety glasses when handling a steering
wheel pad with a deployed airbag.
wDo not apply water, etc. to a steering wheel pad with a
deployed airbag.
wAlways wash your hands with water after completing the
operation.
± SUPPLEMENTAL RESTRAINT SYSTEMSTEERING WHEEL PAD AND SPIRAL CABLERS±13

When scrapping vehicle
HINT: Have a battery ready as the power source to deploy the
airbag.
1. CONFIRM FUNCTIONING OF SST
(See page RS±19)
SST 09082±00700
2. INSTALL SST
CAUTION: Check that there is no looseness in the steer-
ing wheel and steering wheel pad.
(a) Disconnect the airbag connector of the spiral cable.
(b) Connect the SST connector to the airbag connector of the
spiral cable.
SST 09082±00700
(c) Move the SST to at least 10 m (33 ft) from the front of the
vehicle.
(d) Close all the doors and windows of the vehicle.
NOTICE: Take care not to damage the SST wire harness.
(e) Connect the SST red clip to the battery positive (+) terminal
and the black clip to the battery negative (±) terminal.
3. DEPLOY AIRBAG
(a) Confirm that no±one is inside the vehicle or within 10 m
(33 ft) of the vehicle.
(b) Press the SST activation switch and deploy the airbag.
HINT: The airbag deploys simultaneously as the LED of the
SST activation switch lights up. RS±14
± SUPPLEMENTAL RESTRAINT SYSTEMSTEERING WHEEL PAD AND SPIRAL CABLE

4. DISPOSAL OF STEERING WHEEL PAD (WITH AIRBAG)
CAUTION:
wThe steering wheel pad is very hot when the airbag is
deployed, so leave it alone for at least 30 minutes after
deployment.
wUse gloves and safety glasses when handling a steering
wheel pad with a deployed airbag.
wDo not apply water, etc. to a steering wheel pad with a
deployed airbag.
wAlways wash your hands with water after completing the
operation.
(a) When scrapping a vehicle, deploy the airbag and scrap the
vehicle with the steering wheel pad still installed.
(b) When moving a vehicle for scrapping which has a steering
wheel pad with deployed airbag, use gloves and safety
glasses.
When disposing of steering wheel pad only
When disposing of the steering wheel pad (with airbag)
only, never use the customer's vehicle to deploy the air-
bag.
Remove the steering wheel pad from the vehicle and be sure
to follow the procedure given below when deploying the air-
bag.
HINT: Have a battery ready as the power source to deploy the
airbag.
1. REMOVE STEERING WHEEL PAD (See SR section)
CAUTION:
wWhen removing the steering wheel pad (with airbag),
work 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 storing the steering wheel pad, keep the upper
surface of the pad facing upward.
2. REMOVE STEERING WHEEL PAD CONNECTOR
Remove the connector on the steering wheel pad rear sur-
face from the inflater cover.
± SUPPLEMENTAL RESTRAINT SYSTEMSTEERING WHEEL PAD AND SPIRAL CABLERS±15

3. FIX STEERING WHEEL PAD TO DISC WHEEL WITH TIRE
(a) Install the 2 bolts and washers in the 2 bolt holes in the
steering wheel pad.
Bolt:
L: 35.0 mm (1.378 in.)
M: 6.0 mm (0.236 in.)
Pitch: 1.0 mm (0.039 in.)
NOTICE:
wTighten the bolts by hand until the bolts become difficult
to turn.
wDo not tighten the bolts too much.
(b) Using a service±purpose wire harness for the vehicle tie
down the steering wheel pad to the disc wheel.
Wire harness: Stripped wire harness section
1.25 mm
2 or more (0.0019 in2 or more)
HINT: To calculate the square of the stripped wire harness
section
Square = 3.14 X (Diameter)
2 divided by 4
CAUTION: If a wire harness which is too thin or some oth-
er thing is used to tie down the steering wheel pad, it may
be snapped by the shock when the airbag is deployed.
This is highly dangerous. Always use a wire harness for
vehicle use which is at least 1.25 mm
2 (0.0019 in2.).
(1) Using 3 wire harnesses, wrap the wire harnesses at
least 2 times each around the bolts installed on the left
and right sides of the steering wheel pad.
CAUTION:
wTightly wind the wire harness around the bolts so that
there is no slack.
wIf there is slackness in the wire harness, the steering
wheel pad may come loose due to the shock when the
airbag is deployed. This is highly dangerous.
(2) Face the upper surface of the steering wheel pad upward.
(3) Separately tie the left and right sides of the steering wheel
pad to the disc wheel through the hub nut holes.
(c) Position the steering wheel pad connector so that it hangs
downward through a hub hole in the disc wheel. RS±16
± SUPPLEMENTAL RESTRAINT SYSTEMSTEERING WHEEL PAD AND SPIRAL CABLE

CAUTION:
wMake sure that the wire harness is tight. It is very
dangerous if looseness in the wire harness results in the
steering wheel pad coming free through the shock of the
airbag deploying.
wAlways tie down the steering wheel pad with the pad side
facing upward. It is very dangerous if the steering wheel
pad is tied down with the metal surface facing upward as
the wire harness will be cut by the shock of the airbag
deploying and the steering wheel pad will be thrown into
the air.
HINT: The disc wheel will be marked by airbag deployment,
so use a redundant disc wheel.
4. CONFIRM FUNCTIONING OF SST
(See page RS±19)
SST 09082±00070
5. INSTALL SST
CAUTION: Place the disc wheel on level ground.
(a) Connect the SST connector to the steering wheel pad
connector:
SST 09082±00700
NOTICE: To avoid damaging the SST connector and wire
harness, do not lock the secondary lock of the twin lock.
Also, provide some slack for the SST wire harness inside
the disc wheel.
(b) Move the SST to at least 10 m (33 ft) away from the steering
wheel pad tied down on the disc wheel.
± SUPPLEMENTAL RESTRAINT SYSTEMSTEERING WHEEL PAD AND SPIRAL CABLERS±17