wheel LEXUS GS400 2000 Service Manual PDF

RS01Z±02
H02570
H02571Spiral Cable
H02572
H02573
H03446
RS±2
± SUPPLEMENTAL RESTRAINT SYSTEMSRS AIRBAG
2233 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
OPERATION
1. STEERING WHEEL PAD (with AIRBAG)
The inflater and bag of the SRS are stored in the steering wheel
pad and cannot be disassembled. The inflater contains a squib,
igniter charge, gas generant, etc., and inflates the bag when
instructed by the airbag sensor assembly.
2. SPIRAL CABLE (in COMBINATION SWITCH)
A spiral cable is used as an electrical joint from the vehicle body
side to the steering wheel.
3. FRONT PASSENGER AIRBAG ASSEMBLY
The inflater and bag of the SRS are stored in the front passen-
ger airbag assembly and cannot be disassembled. The inflater
contains a squib, igniter charge, gas generant, etc., and inflates
the bag when instructed by the airbag sensor assembly.
4. SIDE AIRBAG ASSEMBLY
The inflater and bag of the SRS side airbag are stored in the
side airbag assembly and cannot be disassembled. The inflater
contains a squib, igniter charge, gas generant, etc., and inflates
the bag when instructed by the side airbag sensor assembly.
5. SEAT BELT PRETENSIONER
The seat belt pretensioner system is a component of the front
seat outer belt. The pretensioner contains a squib, gas gener-
ant, wire, piston, etc., and operates in the event of a frontal colli-
sion.

H00998
Pretensioner (LH)Side Airbag Assembly (LH)
(Squib)Side Airbag Sensor (LH) Front Airbag Sensor (LH) Front Airbag Sensor (RH) Side Airbag Sensor (RH)Side Airbag Assembly (RH)
(Squib) Pretensioner (RH)
Airbag Sensor
AssemblyFront Passenger
Airbag Assembly
Spiral Cable
Steering Wheel
Pad (Squib)
Driver's Side J/B 12
34
5
67 8
10
119
12 13 1415
RS±4
± SUPPLEMENTAL RESTRAINT SYSTEMSRS AIRBAG
2235 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
10. SRS CONNECTORS
No.ItemApplication
(1)Terminal Twin±Lock MechanismConnectors 1, 2, 3, 4, 5, 7, 8, 9, 10, 11, 12, 13, 14, 15
(2)Airbag Activation Prevention MechanismConnectors 1, 2, 3, 4, 5, 7, 8, 9, 12, 13
(3)Electrical Connection Check MechanismConnectors 1, 2, 3
(4)Connector Twin±Lock MechanismConnectors 5

AB0089
Secondary Lock
Primary LockLockLock
Primary Lock Incomplete
(Secondary Lock Prevented)Primary Lock Complete
(Secondary Lock Permitted)Twin±Lock Completed
Z14034
Fig.1
Fig.2Power Source
Safing
Sensor
Squibs
Airbag Sensor
± SUPPLEMENTAL RESTRAINT SYSTEMSRS AIRBAG
RS±7
2238 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(4) Connector Twin±Lock Mechanism
With this mechanism connectors (male and female
connectors) are locked by 2 locking devices to in-
crease the connection reliability. If the primary lock
is incomplete, ribs interfere and prevent the sec-
ondary lock.
(b) When the vehicle is involved in a frontal collision in the
hatched area (Fig. 1) and the shock is larger than the pre-
determined level, the SRS is activated automatically. A
safing sensor is designed to go on at a smaller decelera-
tion rate than the airbag sensor. As illustrated in Fig. 2,
ignition is caused when current flows to the squib, which
happens when a safing sensor and the airbag sensor go
on simultaneously. When a deceleration force acts on the
sensors, 2 squibs in the driver airbag and front passenger
airbag ignite and generate gas. The gas discharging into
the driver airbag and front passenger airbag rapidly in-
creases the pressure inside the bags, breaking open the
steering wheel pad and instrument panel door.
Bag inflation then ends, and the bags deflate as the gas
is discharged through discharge holes at the bag's rear or
side.

H01586
Slider
Disconnection is completed Slider
± SUPPLEMENTAL RESTRAINT SYSTEMSRS AIRBAG
RS±11
2242 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
15. DISCONNECTION OF CONNECTORS FOR STEERING
WHEEL PAD (with AIRBAG) AND FRONT PAS-
SENGER AIRBAG ASSEMBLY
(a) Place a finger on the slider.
(b) Slide the slider to release lock.
(c) Disconnect the connector.

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.

RS08B±01
± SUPPLEMENTAL RESTRAINT SYSTEMSTEERING WHEEL PAD AND SPIRAL CABLE
RS±25
2256 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
REPLACEMENT
REPLACEMENT REQUIREMENTS
In the following case, replace the steering wheel pad, steering wheel or spiral cable.

If the airbag has been deployed.

If the steering wheel pad or spiral cable has been found to be faulty in troubleshooting.

If the steering wheel pad, steering or spiral cable has been found to be faulty during the check
in items (See page RS±15).

If the steering wheel pad has been dropped.
CAUTION:
For removal and installation of the steering wheel pad, see page SR±11 and SR±17. Be sure to follow
the correct procedure.

RS08C±01
RS±26
± SUPPLEMENTAL RESTRAINT SYSTEMSTEERING WHEEL PAD AND SPIRAL CABLE
2257 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
INSTALLATION
INSTALL STEERING WHEEL AND SPIRAL CABLE (See page SR±17)

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.

AB0158
SSTBattery
H02608
Tires
(5 or More)
R05403
H0260910 m (33 ft) or more SSTBattery Side Airbag Assembly
± SUPPLEMENTAL RESTRAINT SYSTEMSIDE AIRBAG ASSEMBLY
RS±47
2278 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)

Always tie down the side airbag assembly with the
airbag deployment side facing inside.
NOTICE:
The tire will be marked by the airbag deployment, so when
disposing of the airbag use a redundant tire.
(d) Check functioning of the SST
(See step 1±(a) on page RS±17).
SST 09082±00700
(e) Place the tires.
(1) Place at least 2 tires under the tire to which the side
airbag assembly is tied.
(2) Place at least 2 tires over the tire to which the side
airbag assembly is tied. The top tire should have the
wheel installed.
(3) Tie the tires together with 2 wire harness.
CAUTION:
Make sure that the wire harness are 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) Install the SST.
Connect the connectors of the 2 SST to the side airbag
assembly connector.
SST 09082±00700, 09082±00750
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 tire.
(g) Deploy the airbag.

RS084±01
H02621
Combination Meter
(Warning Light)
Steering Wheel Pad
(with Airbag)
Spiral CableRH Front Airbag SensorFront Passenger Airbag Assembly
RH Side Airbag
Assembly
RH Side Airbag
Sensor Assembly
RH Seat Belt
Pretensioner
Airbag Sensor Assembly LH Side Airbag
Assembly LH Seat Belt
Pretensioner LH Side Airbag
Sensor Assembly LH Front Airbag
Sensor
RS±68
± SUPPLEMENTAL RESTRAINT SYSTEMWIRE HARNESS AND CONNECTOR
2299 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
WIRE HARNESS AND CONNECTOR
LOCATION