Lexus SC300 / Lexus SC400. Service manual — part 52

NG

OK

Check center airbag sensor assembly.

3

(1) Disconnect negative (–) terminal cable from

battery, and wait at least 20 seconds.

(2) Turn ignition switch lock.
(3) Disconnect center airbag sensor assembly

connector.

(4) Using a service wire, connector terminal Tc of

center airbag sensor assembly connector to
body ground.

(5) Install the center airbag sensor assembly.
(6) Connect negative (–) terminal cable to battery.
(7) Turn ignition switch ACC or ON.

Check operation of airbag warning light.

Airbag light comes on.

Check harness between center airbag sensor
assembly and TDCL or check connector.

Replace center airbag sensor assembly.

C

P

OK

Caution

Never turn ignition switch ACC or ON and
never connect negative (–) terminal to battery
before the center airbag sensor assembly is
installed.

–

SRS AIRBAG

Troubleshooting

AB–89

NG

OK

Check resistance between terminal Tc of center airbag sensor
assembly and body ground.

1

Check resistance between terminal Tc of center
airbag sensor assembly and body ground.

Replace center airbag sensor assembly.

Resistance: 1M

or higher

(1)

Turn ignition switch LOCK.

(2)

Disconnect center airbag sensor assembly
connector.

Repair or replace harness or connector.

HINT: If the diagnostic code is continuously displayed, perform the following troubleshooting.

AB–90

–

SRS AIRBAG

Troubleshooting

DISPOSAL OF STEERING WHEEL
PAD (WITH AIRBAG)

When scrapping vehicles equipped with an airbag system or dis-
posing of a steering wheel pad (with airbag), always first deploy
the airbag in accordance with the procedure described below.
If any abnormality occurs with the airbag deployment, contact the
SERVICE DEPT. of TOYOTA MOTOR SALES, U.S.A., INC..
Never dispose of a steering wheel pad which has an
undeployed airbag.
When disposing of a steering wheel pad with an airbag deployed
in a collision, follow the same procedure given under “AIRBAG
DEPLOYMENT PROCEDURE (WHEN SCRAPPING THE VE-
HICLE), part 5, DISPOSAL OF STEERING WHEEL PAD (WITH
AIRBAG)” (See page

AB–93

).

PRECAUTIONS FOR AIRBAG DEPLOYMENT

1.

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.

2. 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.

3.

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

4.

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

5.

Use gloves and safety glasses when handling a steering
wheel pad with deployed airbag.

6.

Always wash your hands with water after completing the
operation.

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

deployed airbag.

AIRBAG DEPLOYMENT PROCEDURE
(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 approx. 30 sec-
onds or longer from the time the ignition switch is turned
to the LOCK position and the negative (–) terminal cable
is disconnected from the battery (See page

AB–2

).

–

SRS AIRBAG

Disposal of Steering Wheel Pad (with Airbag)

AB–91

2.

CONFIRM FUNCTIONING OF SST (See page

AB–97

)

SST 09082–00700

3. INSTALL

SST

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

4. DEPLOY

AIRBAG

(a) Confirm that no–one is inside the vehicle or within 10

(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.

AB–92

–

SRS AIRBAG

Disposal of Steering Wheel Pad (with Airbag)