Lexus RX300 (MCU15). Service manual - part 526

RS0JS–08

H17194

H05065

H05066

Horn Button
Contact Plate

H17195

RS–14

–

SUPPLEMENTAL RESTRAINT SYSTEM

STEERING WHEEL PAD AND SPIRAL CABLE

LEXUS RX300   (RM785E)

INSPECTION

1.

Vehicle not involved in collision:
INSPECT SUPPLEMENTAL RESTRAINT SYSTEM

(a)

Do a diagnostic system check (See page DI–305).

(b)

Do a visual check which includes the following item with
the steering wheel pad (with airbag) installed in the ve-
hicle.
Check cuts, minute cracks or marked discoloration on the
steering wheel pad top surface and in the grooved por-
tion.

2.

Vehicle involved in collision and airbag is not
deployed:
INSPECT SUPPLEMENTAL RESTRAINT SYSTEM

(a)

Do a diagnostic system check (See page DI–305).

(b)

Do a visual check which includes the following items with
the steering wheel pad (with airbag) removed from the ve-
hicle.

S

Check cuts, minute cracks or marked discoloration
on the steering wheel pad top surface and in the
grooved portion.

S

Check cuts and cracks in wire harness, and chip-
ping in connectors.

S

Check the deformation of the horn button contact
plate of the steering wheel.

CAUTION:
For removal and installation of the steering wheel pad, see
page SR–12 and SR–18, be sure to follow the correct proce-
dure.
HINT:

S

If the horn button contact plate of the steering wheel is de-
formed, never repair it. Always replace the steering wheel
assembly with a new one.

S

There should be no interference between the steering
wheel pad and steering wheel, and the clearance should
be uniform all the way around when the new steering
wheel pad is installed on the steering wheel.

H05066

Horn Button
Contact Plate

H17195

–

SUPPLEMENTAL RESTRAINT SYSTEM

STEERING WHEEL PAD AND SPIRAL CABLE

RS–15

LEXUS RX300   (RM785E)

3.

Vehicle involved in collision and airbag is deployed:
INSPECT SUPPLEMENTAL RESTRAINT SYSTEM

(a)

Do a diagnostic system check (See page DI–305).

(b)

Do a visual check which includes the following items with
the steering wheel pad (with airbag) removed from the ve-
hicle.

S

Check the deformation on the horn button contact
plate of the steering wheel.

S

Check the damage on the spiral cable connector
and wire harness.

CAUTION:
For removal and installation of the steering wheel pad, see
page SR–12 and SR–18, and be sure to follow the correct
procedure.
HINT:

S

If the horn button contact plate of the steering wheel is de-
formed, never repair it. Always replace the steering wheel
assembly with a new one.

S

There should be no interference between the steering
wheel pad and steering wheel, and the clearance should
be uniform all the way around when the new steering
wheel pad is installed on the steering wheel.

RS0JT–08

AB0152

SST

AB0158

SST

Battery

RS–16

–

SUPPLEMENTAL RESTRAINT SYSTEM

STEERING WHEEL PAD AND SPIRAL CABLE

LEXUS RX300   (RM785E)

DISPOSAL

HINT:
When scrapping vehicle equipped with an SRS or disposing of
a steering wheel pad (with airbag), always first deploy the air-
bag in accordance with the procedure described below. If any
abnormality occurs with the airbag deployment, contact the
SERVICE DEPT. of the DISTRIBUTOR.
CAUTION:

S

Never dispose of a steering wheel pad which has an
undeployed airbag.

S

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.

S

When deploying the airbag, always use the specified
SST (SRS Airbag Deployment Tool). Perform the op-
eration in a place away from electrical noise.
SST

09082–00700

S

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

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.

1.

AIRBAG DEPLOYMENT WHEN SCRAPPING VE-
HICLE

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

AB0152

SST

AB0158

SST

Battery

H01580

SST

H17196

H17197

SST

–

SUPPLEMENTAL RESTRAINT SYSTEM

STEERING WHEEL PAD AND SPIRAL CABLE

RS–17

LEXUS RX300   (RM785E)

(a)

Check functioning of the SST.

CAUTION:
When deploying the airbag, always use the specified SST:
SRS Airbag Deployment Tool.

SST

09082–00700

(1)

Connect the red clip of the SST to the battery posi-
tive (+) terminal and the black clip to the battery neg-
ative (–) terminal.

HINT:
Do not connect the yellow connector which will be connected
with the supplemental restraint system.

(2)

Press the SST activation switch, and check that the
LED of the SST activation switch lights up.

CAUTION:
If the LED lights up when the activation switch is not being
pressed, SST malfunction is probable, so definitely do not
use the SST.

(3)

Disconnect the SST from the battery.

(b)

Install the SST.

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

(1)

While turning the steering wheel right / left, remove
the 3 screws and column lower cover.

(2)

Disconnect the airbag connector of the spiral cable.

(3)

Connect the connectors of the 2 SST to the airbag
connector of the spiral cable.

SST

09082–00700, 09082–00760

NOTICE:
To avoid damaging the connector of the SST and wire har-
ness, do not lock the secondary lock of the twin lock.