light LEXUS GS400 2000 Service Repair Manual

AB0158
SSTBattery
AB0152
SST
AB0158
SSTBattery
H01580
SST
H03723
RS±18
± SUPPLEMENTAL RESTRAINT SYSTEMSTEERING WHEEL PAD AND SPIRAL CABLE
2249 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
1. AIRBAG DEPLOYMENT WHEN SCRAPPING VE-
HICLE
HINT:
Have a battery ready as the power source to deploy the airbag.
(a) Check functioning of SST
CAUTION:
When deploying the airbag, always use the specified SST:
SRS Airbag Deployment Tool.
SST 09082±00700
(1) Connect the SST battery.
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) Check functioning of SST.
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.
(b) Install the SST.
CAUTION:
Check that there is no looseness in the steering wheel and
steering wheel pad.
(1) Remove the steering column lower cover.
Remove the 3 screws and steering column lower
cover as shown in the illustration.
(2) Disconnect the airbag connector of the spiral cable.

H03724SST
R13455
10 m (33 ft) or more
R06753
± SUPPLEMENTAL RESTRAINT SYSTEMSTEERING WHEEL PAD AND SPIRAL CABLE
RS±19
2250 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(3) Connect the SST connector to the airbag connector
of the spiral cable.
SST 09082±00700
(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) Confirm 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.
HINT:
The airbag deploys simultaneously as the LED of the SST ac-
tivation switch lights up.
(d) Dispose 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 af-
ter deployment.

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

Always wash your hands with water after completing
the operation.

Do not apply water, etc. to a steering wheel pad with
the deployed airbag.
(1) When scrapping a vehicle, deploy the airbag and
scrap the vehicle with the steering wheel pad still
installed.
(2) When moving a vehicle for scrapping which has a
steering wheel pad with deployed airbag, use
gloves and safety glasses.

H02586Weight
y
x y
R04211
Inner Diam.
Tires
(3 or More)Width
H0257810 m (33 ft) or more
± SUPPLEMENTAL RESTRAINT SYSTEMSTEERING WHEEL PAD AND SPIRAL CABLE
RS±23
2254 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(f) Cover steering wheel pad with cardboard box or tires.

Covering method using 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.)
When dimension of the cardboard box exceeds the di-
ameter of the disc wheel with tire which 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 specified size is used,
the cardboard box will be broken by the shock from the air-
bag deployment.

Covering method using tires:
Place at least 3 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 (7.87 in.)
Inner diameter: 360 mm (14.17 in.)
CAUTION:
Do not use tires with disc wheels.
NOTICE:
The tires may be marked by the airbag deployment, so use
the redundant tires.
(g) Deploy the airbag.
(1) Connect the SST red clip to the battery positive (+)
terminal and the black clip to the battery negative
(±) terminal.
(2) Check that no one is within 10 m (33 ft) area around
the disc wheel which the steering wheel pad is tied
to.
(3) Press the SST activation switch and deploy the air-
bag.
HINT:
The airbag deploys simultaneously as the LED of the SST ac-
tivation switch lights up.

H02575
H02574
H02700
H02576
± SUPPLEMENTAL RESTRAINT SYSTEMSRS AIRBAG
RS±3
2234 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
6. SRS WARNING LIGHT
The SRS warning light is located on the combination meter. It
goes on to alert the driver of trouble in the system when a mal-
function is detected in the airbag sensor assembly. In normal
operation conditions when the ignition switch is turned to the
ACC or ON position, the light goes on for apporx. 6 seconds and
then goes off.
7. AIRBAG SENSOR ASSEMBLY
The airbag sensor assembly is mounted on the floor inside the
lower center finish panel. The airbag sensor assembly consists
of an airbag sensor, safing sensor, diagnosis circuit, ignition
control and drive circuit, etc. It receives signals from the airbag
sensor and judges whether the SRS must be activated or not.
8. FRONT AIRBAG SENSOR
The front airbag sensor is mounted inside each of the front
members. The sensor unit is a mechanical type. When the sen-
sor detects deceleration force above a predetermined limit,
contact is made in the sensor, sending a signal to the airbag
sensor assembly. The sensor cannot be disassembled.
9. SIDE AIRBAG SENSOR ASSEMBLY
The side airbag sensor assembly is mounted in the LH and RH
center pillar. The side airbag sensor assembly consists of a side
airbag sensor, safing sensor, diagnosis circuit, ignition control
and drive circuit, etc. It receives signals from the side airbag
sensors and judges whether the SRS side airbag must be acti-
vated or not.

R12076Airbag Sensor AssemblyDisconnection
Detection
PinSRS
Warning
Light
H00955
Terminal for Diagnosis
Disconnection Detection Pin
Half Connection
Complete Connection
Terminal for
Diagnosis
RS±6
± SUPPLEMENTAL RESTRAINT SYSTEMSRS AIRBAG
2237 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
HINT:
The type of connector shown on the previous page is used for
the spiral cable connector º5º on the airbag sensor assembly
side.
(3) Electrical Connection Check Mechanism
This mechanism electrically checks that connectors
are connected correctly and completely. The electri-
cal connection check mechanism is designed so
that the disconnection detection pin connects with
the diagnosis terminals when the connector hous-
ing lock is locked.
HINT:
The above illustration shows connectors º1º, º2º and º3º.

H01581
Outer
H01582
Lock of connector is released
Disconnection is completed
H01583
Outer
Outer
RS±8
± SUPPLEMENTAL RESTRAINT SYSTEMSRS AIRBAG
2239 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
11. DISCONNECTION OF AIRBAG SENSOR CONNEC-
TOR
(a) With holding both flank sides of the outer, slide the outer
to the direction shown by an arrow.
(b) When lock of the connectors is released disconnect the
connector.
HINT:
Make sure to hold both flank sides of the outer. If holding the top
and bottom sides, it obstructs disconnection.
12. CONNECTION OF AIRBAG SENSOR CONNECTOR
(a) Align the male connector (on the side of sensor) and fe-
male connector in the same direction as shown in the il-
lustration and fit in them without rubbing.
(b) As they are fitted in, the outer slides rearward. Press it un-
til the outer returns to its original position again.
If fitting stops on the half way, connectors will separate.
(c) Make sure to insert until the connectors are locked. After
fitting in, pull them lightly to check that they are locked.
(When locked, make sure that the outer returns to its origi-
nal position and sound at the time of fitting in can be
heard.)
HINT:
Do not fit in with holding the outer.
When fitting in, the outer slides. Do not touch it.

H01585
SliderSlider
RS±10
± SUPPLEMENTAL RESTRAINT SYSTEMSRS AIRBAG
2241 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
14. CONNECTION OF SIDE AIRBAG CONNECTOR
(a) Align the male connector and the female connector in the
same direction as shown in the illustration, fit in them with-
out rubbing.
(b) Make sure to insert until the connectors are locked. After
fitting in, pull them lightly to check that they are locked.
(When locked, make sure that the outer returns to its origi-
nal position and sound at the time of fitting in can be
heard.)
HINT:
As the slider slides, do not touch it.
Be careful not to deform the release board. If the release
board is deformed, replace it with a new one.

H01587
SliderSlider
RS±12
± SUPPLEMENTAL RESTRAINT SYSTEMSRS AIRBAG
2243 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
16. CONNECTION OF CONNECTORS FOR STEERING
WHEEL PAD (with AIRBAG) AND FRONT PAS-
SENGER AIRBAG ASSEMBLY
(a) Align the male connector and the female connector in the
same direction as shown in the illustration, fit in them with-
out rubbing.
(b) Make sure to insert until the connectors are locked. After
fitting in, pull them lightly to check that they are locked.
(When locked, make sure that the outer returns to its origi-
nal position and sound at the time of fitting in can be
heard.)
HINT:
As the slider slides, do not touch it.
Be careful not to deform the release board. If the release
board is deformed, replace it with a new one.

AB0158
Battery
SST
H02589
H02594
R13455
10 m (33 ft) or more
R09686
RS±32
± SUPPLEMENTAL RESTRAINT SYSTEMFRONT PASSENGER AIRBAG ASSEMBLY
2263 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
1. AIRBAG DEPLOYMENT WHEN SCRAPPING VE-
HICLE
HINT:
Have a battery ready as the power source to deploy the airbag.
(a) Check functioning of SST.
(See page RS±17)
SST 09082±00700, 09082±00760
(b) Disconnect the airbag connector.
(1) Using a screwdriver, remove the glove compart-
ment door finish plate.
HINT:
Tape the screwdriver tip before use.
(2) Remove the airbag connector from the plate.
(3) Disconnect the airbag connector.
(c) Install the SST.
(1) Connect the 2 SST each other, then connect them
to the airbag connector of the spiral cable.
SST 09082±00700, 09082±00760
NOTICE:
To avoid damage to the SST connector and wire harness,
do not lock the secondary lock of the twin lock.
(2) Move the SST at least 10 m (33 ft) away from the
front of the vehicle.
(3) Close all the doors and windows of the vehicle.
NOTICE:
Take care not to damage the SST wire harness.
(4) Connect the SST red clip to the battery positive (+)
terminal and the black clip to the battery negative
(±) terminal.
(d) 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.
HINT:
The airbag deploys simultaneously as the LED of the SST ac-
tivation switch lights up.

R09689
Tires
(5 or More)
R05403
H02597
SST
Battery
10 m (33 ft) or more
Front Passenger
Airbag Assembly
R09687
± SUPPLEMENTAL RESTRAINT SYSTEMFRONT PASSENGER AIRBAG ASSEMBLY
RS±35
2266 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(e) Place the tires
(1) Place at least 2 tires under the tire to which the front
passenger airbag assembly is tied.
(2) Place at least 2 tires over the tire to which the front
passenger airbag assembly is tied. The top tier
should have the wheel installed.
(3) Tie the tires together with 2 wire harness.
CAUTION:
Make sure that the wire harness is tight. It is very danger-
ous when loose wire harness results in the tires coming
free due to the shock from the airbag deploying.
HINT:
Place the SST connector and wire harness inside tires. Secure
at least 1 m (3 ft) of slack for the wire harness.
(f) Deploy the airbag.
(1) Connect the SST red clip to the battery positive (+)
terminal and the black clip to the battery negative(±)
terminal.
(2) Check that no one is within 10 m (33 ft) area around
the tire which the front passenger airbag assembly
is tied to.
(3) Press the SST activation switch and deploy the air-
bag.
HINT:
The airbag deploys simultaneously as the LED of the SST ac-
tivation switch lights up.
(g) Dispose of front passenger airbag assembly.
CAUTION:

The front passenger airbag assembly 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 front
passenger airbag assembly with the deployed airbag.

Always wash your hands with water after completing
the operation.