steering wheel LEXUS GS400 2000 Service Service Manual

H02584
AB0158
SSTBattery
H02585
SST RS±22
± SUPPLEMENTAL RESTRAINT SYSTEMSTEERING WHEEL PAD AND SPIRAL CABLE
2253 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(4) 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:

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 through the shock
from the airbag deploying.

Always tie down the steering wheel pad with the pad
side facing upward. It is very dangerous when the
steering wheel pad is tied down with the metal sur-
face facing upward and the steering wheel pad will be
thrown into the air.
NOTICE:
The disc wheel will be marked by airbag deployment, so
use the redundant disc wheel.
(d) Check functioning of SST.
SST 09082±00700, 09082±00760
(e) Install the SST
CAUTION:
Place the disc wheel on the level ground.
(1) Connect the 2 SST each other, then connect them
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
steering wheel pad tied down on the disc wheel.

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.

AB0166
RS±24
± SUPPLEMENTAL RESTRAINT SYSTEMSTEERING WHEEL PAD AND SPIRAL CABLE
2255 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(h) Dispose of the 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 deployed airbag.

Always wash your hands with water after completing
the operation.

Do not apply water, etc. to a steering wheel pad with
deployed airbag.
(1) Remove the steering wheel pad from the disc
wheel.
(2) Place the steering wheel pad in a vinyl bag, tie the
end tightly and dispose of it in the same way as oth-
er general parts disposal.

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)