Lexus SC300 / Lexus SC400. Manual - part 782

4. 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.

5. 

DISPOSAL OF STEERING WHEEL PAD (WITH AIRBAG)
CAUTION:

•

The steering wheel pad is very hot when the airbag is

deployed, so leave it alone for at least 30 minutes after

deployment.

•

Use gloves and safety glasses when handling a steering

wheel pad with deployed airbag.

•

Do not apply water, etc. to a steering wheel pad with

deployed airbag.

•

Always 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 the 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 deploy the
airbag.

1. 

REMOVE STEERING WHEEL PAD (See page 

RS–18

)

CAUTION:

•

When removing the steering wheel pad (with airbag),

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.

•

When storing the steering wheel pad, keep the upper

surface of the pad facing upward.

–

SUPPLEMENTAL RESTRAINT SYSTEM

STEERING WHEEL PAD AND SPIRAL CABLE

RS–23

2. 

REMOVE STEERING WHEEL PAD CONNECTOR
Remove the connector on the steering wheel pad rear sur-
face from the inflater cover.

3. 

FIX STEERING WHEEL PAD TO DISC WHEEL WITH TIRE

(a)  Install the 4 bolts with washer in the 4 bolt holes in the

steering wheel pad.

Bolt:

L 35.0 mm (1.398 in.) M 6.0 mm (0.236 in.) Pitch 1.0 mm

(0.039 in.)

NOTICE:

•

Tighten the bolts by hand until the bolts become difficult

to turn.

•

Do not tighten the bolts too much.

(b)  Using a service–purpose wire harness for 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 in

2

 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 chock 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 in

2

.).

(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:

•

 Tightly wind the wire harness around the bolts so that

there is no slack.

•

 If 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.

RS–24

–

SUPPLEMENTAL RESTRAINT SYSTEM

STEERING WHEEL PAD AND SPIRAL CABLE

(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.
CAUTION:

•

Make 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.

•

 Always 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–27

)

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 SYSTEM

STEERING WHEEL PAD AND SPIRAL CABLE

RS–25

6. COVER 

STEERING 

WHEEL 

PAD 

WITH 

CARDBOARD

BOX OR TIRES
Covering Method Using Cardboard Box:
Cover the steering wheel pad with the cardboard box and
weigh the cardboard box down in four places with a at least
196 N (20 kgf, 44 lbf).

Size of cardboard box:

Must exceed the following dimensions–

x = 460 mm (18.11 in.)

When dimension y of the cardboard box exceeds the

diameter of the disc wheel with tire the steering wheel

pad is tied to–

x = 460 mm (18.11 in.) + width of tire

y = 650 mm (25.59 in.)

NOTICE: If a cardboard box smaller than the size speci-
fied is used, the cardboard box will be broken by the
shock of the airbag deployment.

Covering Method Using Tires:
Place at least 3 tires without disc wheel on top of the disc
wheel with tire to which the steering wheel pad is tied.

Tire size: Must exceed the following dimensions–

Width 185 mm (7.28 in.)

Inner diam 360 mm (14.17 in.)

CAUTION: Do not use tires with disc wheels.
NOTICE: The tires by marked by the airbag deployment,
so use redundant tires.

7. AIRBAG 

DEPLOYMENT

(a)  Connect the SST red clip to the battery positive (+) terminal

and the black clip to the battery negative (–) terminal.

(b)  Confirm that no–one is within 10 m (33 ft) of the disc wheel

the steering wheel pad is tied to.

(c)  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–26

–

SUPPLEMENTAL RESTRAINT SYSTEM

STEERING WHEEL PAD AND SPIRAL CABLE