Lexus SC300 / Lexus SC400. Service manual — part 781

2.

REMOVE STEERING WHEEL PAD

(a) Place the front wheels facing straight ahead.
(b) Using a torx wrench, loosen the 4 screws. Torx wrench: T30

(Part No. 09042–00010 or locally manufactured tool)

(d) Loosen the torx screws until the groove along the screw

circumference catches on the screw case.

(e) Pull

the

wheel pad out from the steering wheel and

disconnect the SRS connector.

NOTICE: When removing the wheel pad, take care not to
pull the airbag wire harness.
CAUTION:

•

When storing the wheel pad, keep the upper surface of

the pad facing upward (See pages

RS–3

).

•

Never disassemble the wheel pad.

3.

REMOVE STEERING WHEEL

(a) Disconnect the connector.
(b) Remove the set nut.
(c) Place matchmarks on the steering wheel and main shaft.
(d) Using SST, remove the steering wheel.

SST 09213–31021

4.

REMOVE AND INSTALL SPIRAL CABLE FROM/TO
COMBINATION SWITCH
(See page

BE–51

)

NOTICE: Do not disassemble the spiral cable or apply oil
to it.

5.

CENTER SPIRAL CABLE

(a) Check that the front wheels are facing straight ahead.
(b) Turn the spiral cable counterclockwise by hand until it

becomes harder to turn the cable.

(c) Then rotate the spiral cable clockwise about 3 turns to align

the red mark.

–

SUPPLEMENTAL RESTRAINT SYSTEM

STEERING WHEEL PAD AND SPIRAL CABLE

RS–19

6.

INSTALL STEERING WHEEL

(a) Align matchmarks on the steering wheel and main shaft, and

install the steering wheel to the main shaft.

(b) Install and torque the set nut.

Torque: 35 N

⋅

m (360 kgf

⋅

cm, 26 ft

⋅

lbf)

(c) Connect the connector.

7.

INSTALL STEERING WHEEL PAD

(a) Connect the SRS connector.
(b) Install the wheel pad after confirming that the circumference

groove of the torx screws is caught on the screw case.

(c) Using a torx wrench, tighten the 4 screws.

Torque: 7.4 N

⋅

m (75 kgf

⋅

cm, 65 in.

⋅

lbf)

NOTICE:

•

Make sure the wheel pad is installed to the specified

torque.

•

If the wheel pad has been dropped, or there are cracks,

dents or other defects in the case or connector, replace

the wheel pad with a new one.

•

When installing the wheel pad, take care that the wirings

do not interfere with other parts and are not pinched

between other parts.

8.

CHECK STEERING WHEEL CENTER POINT

9. CONNECT NEGATIVE (–) TERMINAL CABLE TO

BATTERY

RS–20

–

SUPPLEMENTAL RESTRAINT SYSTEM

STEERING WHEEL PAD AND SPIRAL CABLE

STEERING WHEEL PAD (WITH AIRBAG)
DISPOSAL

RS04E–01

When scrapping vehicles equipped with a supplemental re-
straint system or disposing of a steering wheel pad (with air-
bag), 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 “When scrapping vehicle, step 5. DISPOSAL OF STEER-
ING WHEEL PAD (WITH AIRBAG)” (See page

RS–23

).

PRECAUTIONS FOR AIRBAG DEPLOYMENT

•

The airbag produces a sizeable exploding sound when
it deploys, so perform the operation out–of–doors and
where it will not create a nuisance to nearby residents.

•

When deploying the airbag, always use the specified
SST; SRS AIRBAG DEPLOYMENT TOOL (SST
09082–00700). Perform the operation in a place away
from electrical noise.

•

When deploying an airbag, perform the operation from
at least 10 m (33 ft) away from the steering wheel pad.

•

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.

•

Always wash your hands with water after completing the
operation.

•

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

–

SUPPLEMENTAL RESTRAINT SYSTEM

STEERING WHEEL PAD AND SPIRAL CABLE

RS–21

When scrapping vehicle

HINT: Have a battery ready as the power source to deploy the
airbag.

1.

DISCONNECT NEGATIVE (–) TERMINAL CABLE FROM
BATTERY
CAUTION: Work must be started after 90 seconds from
the time the ignition switch is turned to the LOCK posi-
tion and the negative (–) terminal cable is disconnected
from the battery (See page

RS–2

).

2.

CONFIRM FUNCTIONING OF SST
(See page

RS–27

)

SST 09082–00700

3. INSTALL

SST

CAUTION: Check that there is no looseness in the steer-
ing wheel and steering wheel pad.

(a) Remove the No.1 under cover.
(b) Disconnect the airbag connector of the spiral cable.

(c) Connect the SST connector to the airbag connector of the

spiral cable.
SST 09082–00700

(d) Move the SST to at least 10 m (33 ft) from the front of the

vehicle.

(e) Close all the doors and windows of the vehicle.

NOTICE: Take care not to damage the SST wire harness.

(f)

Connect the SST red clip to the battery positive (+) terminal
and the black clip to the battery negative (–) terminal.

RS–22

–

SUPPLEMENTAL RESTRAINT SYSTEM

STEERING WHEEL PAD AND SPIRAL CABLE