Lexus SC300 / Lexus SC400. Manual - part 53

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.

AIRBAG DEPLOYMENT PROCEDURE
(PROCEDURE FOR DISPOSAL OF
STEERING WHEEL PAD ONLY)

When disposing of the steering wheel pad (with airbag)
only, never use the customer’s vehicle to deploy the
airbag.
Remove the steering wheel pad from the vehicle and be sure
to follow the procedure given below when deploying the
airbag.
HINT: Have a battery ready as the power source to deploy the
airbag.

1. 

REMOVE STEERING WHEEL PAD (SEE PAGE 

AB–16

)

CAUTION:

•

When removing the steering wheel pad (with
airbag), work must be started after approx. 30
seconds or longer 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.

2. 

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

–

SRS AIRBAG

Disposal of Steering Wheel Pad (with Aribag)

AB–93

3.14 X (Diameter)

2

4

3. 

FIX STEERING WHEEL PAD TO DISC WHEEL WITH TIRE
(a)  Install bolts with washers in the four bolt holes in the

steering wheel pad.
Bolt: 

L 

35.0 mm (1.4 in.)

M 6.0 

mm

Pitch

1.0 mm

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 or
more (0.002 in. or more)
HINT: To calculate the square of the stripped wire harness
section –
Square = 

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 (0.002 in.).
(c)

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.

(d) Face the upper surface of the steering wheel pad upward.

Separately tie the left and right sides of the steering
wheel pad to the disc wheel through the hub nut holes.
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.

AB–94

–

SRS AIRBAG

Disposal of Steering Wheel Pad (with Aribag)

•

Always tie down the steering wheel pad with the pad
side facing upward. It is very dangerous if the steer-
ing 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 

AB–94

)

SST 09082–0700

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.

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
20 kg (44 lb, 196 N).
Size of cardboard box: Must exceed the following dimen-
sions –

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.

–

SRS AIRBAG

Disposal of Steering Wheel Pad (with Aribag)

AB–95

(Covering Method Using Tires)
Place at least three 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 may be marked by the airbag deploy-
ment, so use redundent 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.

8. 

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 de-

ployment.

•

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)  Remove the steering wheel pad from the disc wheel.
(b)  Place the steering wheel pad in a vinyl bag, tie the end

tightly and dispose of it the same way as other general
parts.

AB–96

–

SRS AIRBAG

Disposal of Steering Wheel Pad (with Aribag)