Lexus RX300 (MCU15). Manual - part 527

R13455

10 m (33 ft) or more

SST

Battery

R06753

RS–18

–

SUPPLEMENTAL RESTRAINT SYSTEM

STEERING WHEEL PAD AND SPIRAL CABLE

LEXUS RX300   (RM785E)

(4)

Move the SST at least 10 m (33 ft) away from the
front of the vehicle.

(5)

Close all the doors and windows of the vehicle.

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

(6)

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

(c)

Deploy the airbag.
(1)

Check that no one is inside the vehicle or within 10
m (33 ft) area around the vehicle.

(2)

Press the SST activation switch and deploy the air-
bag.

CAUTION:

S

The steering wheel pad is very hot when the airbag is
deployed, so leave it alone for at least 30 minutes af-
ter deployment.

S

Use gloves and safety glasses when handling a steer-
ing wheel pad with the deployed airbag.

S

Always wash your hands with water after completing
the operation.

S

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

S

When scrapping a vehicle, deploy the airbag and
scrap the vehicle with the steering wheel pad still
installed.

S

When moving a vehicle for scrapping which has a
steering wheel pad with deployed airbag, use gloves
and safety glasses.

HINT:
The airbag deploys simultaneously as the LED of the SST ac-
tivation switch lights up.
2.

DEPLOYMENT WHEN DISPOSING OF STEERING
WHEEL PAD ONLY

NOTICE:

S

When disposing of the steering wheel pad (with air-
bag) only, never use the customers vehicle to deploy
the airbag.

S

Be sure to follow the procedure given below when de-
ploying the airbag.

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

H05070

Connector

AB0163

Wire Harness
Diameter

Stripped Wire Harness Section

H05071

L

M

–

SUPPLEMENTAL RESTRAINT SYSTEM

STEERING WHEEL PAD AND SPIRAL CABLE

RS–19

LEXUS RX300   (RM785E)

(a)

Remove the steering wheel pad (See page SR–12).

CAUTION:

S

When removing the steering wheel pad, work must be
started 90 seconds after the ignition switch is turned
to the ”LOCK” position and the negative (–) terminal
cable is disconnected from the battery.

S

When storing the steering wheel pad, keep the upper
surface of the pad facing upward.

(b)

Remove the connector on the steering wheel pad rear
surface.

(c)

Remove the steering wheel pad cover.

(d)

Using a service–purpose wire harness tie down the steer-
ing wheel pad to the disc wheel.
Wire harness: Stripped wire harness section 
1.25 mm

2 

or more (0.0019 in

2

. or more)

CAUTION:
If a wire harness which is too thin or some other 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 in

2

.).

HINT:
To calculate the square of the stripped wire harness section:

Square = 3.14 x (Diameter)

2

 divided by 4

(1)

Install the 2 bolts with washers in the 2 bolt holes in
the steering wheel pad.

Bolt:
L: 35. mm (1.387 in.)
M: 6.0 mm (0.236 in.)
Pitch: 1.0 mm (0.039 in.)

NOTICE:

S

Tighten the bolts by hand until the bolts become diffi-
cult to turn.

S

Do not tighten the bolts too much.

H05072

2 Times or more

H05073

AB0158

SST

Battery

RS–20

–

SUPPLEMENTAL RESTRAINT SYSTEM

STEERING WHEEL PAD AND SPIRAL CABLE

LEXUS RX300   (RM785E)

(2)

Using 3 wire harness, wind the wire harness at least
2 times each around the bolts installed on the left
and right sides of the steering wheel pad.

CAUTION:

S

Tightly wind the wire harness around the bolts so that
there is no slack.

S

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.

(3)

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 con-
nector so that it hangs downward through a hub
hole in the disc wheel.

CAUTION:

S

Make sure that the wire harness is tight. It is very dan-
gerous when looseness in the wire harness results in
the steering wheel pad coming free due to the shock
from the airbag deploying.

S

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 fac-
ing upward as the wire harness will be cut by the
shock from the airbag deploying and the steering
wheel pad will be thrown into the air.

NOTICE:
The disc wheel will be marked by airbag deployment, so
when disposing of the airbag use a redundant disc wheel.
(e)

Check functioning of the SST (See step 1–(a)).
SST

09082–00700

H05074

SST

H05075

10 m (33 ft) or more

H02586

Weight

X

Y

Y

–

SUPPLEMENTAL RESTRAINT SYSTEM

STEERING WHEEL PAD AND SPIRAL CABLE

RS–21

LEXUS RX300   (RM785E)

(f)

Install the SST.

CAUTION:
Place the disc wheel on the level ground.

(1)

Connect the connectors of the 2 SST to the steering
wheel pad connector.

SST

09082–00700, 09082–00760

NOTICE:
To avoid damaging the SST connector and wire harness,
do not lock the secondary lock of the twin lock. Also, se-
cure some slack for the SST wire harness inside the disc
wheel.

(2)

Move the SST to at least 10 m (33 ft) away from the
steering wheel pad tied down on the disc wheel.

(g)

Cover the steering wheel pad with a cardboard box or
tires.

S

Covering method using a cardboard box:
Cover the steering wheel pad with the cardboard
box and weight the cardboard box down in 4 places
with at least 190 N (20 kg, 44 lb).

Size of cardboard box:
Must exceed the following dimensions:
X = 460 mm (18.11 in.)
Y = 650 mm (25.59 in.)

NOTICE:

S

When dimension Y of the cardboard box exceeds the
diameter of the disc wheel with tire to which the steer-
ing wheel pad is tied, X should be the following size.
X = 460 mm (18.11 in.) + width of tire

S

If a cardboard box smaller than the specified size is
used, the cardboard box will be broken by the shock
from the airbag deployment.