Lexus GS300/400 (2000 year). Manual — part 236

F02558

SR0DJ–01

F02559

F03673

PPS Solenoid
Connector

2JZ–GE:

1UZ–FE:

PPS Solenoid
Connector

SR–8

–

STEERING

STEERING WHEEL

2178

STEERING WHEEL

INSPECTION

1.

CHECK STEERING WHEEL FREEPLAY

With the vehicle stopped and tires pointed straight ahead, rock
the steering wheel gently back and forth with light finger pres-
sure.
Freeplay should not exceed the maximum.

Maximum freeplay: 30 mm (1.18 in.)

2.

CHECK STEERING EFFORT

(a)

Center the steering wheel.

(b)

Remove the steering wheel pad. (See page

SR–11

)

(c)

Start the engine and run it at idle.

(d)

Measure the steering effort in both directions.
Reference: 7 N·m (70 kgf·cm, 61 in.·lbf)

HINT:
Be sure to consider the tire type, pressure and contact surface
before making your diagnosis.

(e)

Disconnect the PPS solenoid connector.

(f)

Measure the steering effort in both directions and check
that the steering effort exceeds the reference value in (d),
and that the power assist is operating. If steering effort is
not heavier than (d), check the solenoid.

HINT:
Take the tire type, pressure and contact surface into consider-
ation before making your diagnosis.
(g)

Connect the connector.

(h)

Torque the steering wheel set nut.
Torque: 35 N·m (360 kgf·cm, 26 ft·lbf)

(i)

Install the steering wheel pad.
(See page

SR–17

)

SR0DK–03

F03671

Column Upper Cover

Combination Switch
(w/ Spiral Cable)

Steering Wheel Lower
No.2 Cover

Torx Screw

Steering Wheel Pad

Steering Wheel

Steering Wheel Lower No.3
Cover

Finish Plate

Steering Column
Assembly

Column Lower Cover

8.8 (90, 78 in.·lbf)

Torx Screw

8.8 (90, 78 in.·lbf)

35 (360, 26)

25 (260, 19)

End Pad

No.1 Safety
Pad

Brake Pedal
Return Spring

Dust Cover

Intermediate Shaft
Assembly

Heater to Register Dust No.7

OBD II

No.1 Under Cover

Hood Lock Release
Lever

N·m (kgf·cm, ft·lbf)

: Specified torque

35 (360, 26)

–

STEERING

POWER TILT AND POWER TELESCOPIC STEERING
COLUMN

SR–9

2179

POWER TILT AND POWER TELESCOPIC STEERING
COLUMN

COMPONENTS

F09281

No.2 Intermediate Shaft
Assembly

Tilt and Telescopic ECU

No.2 Bracket

Steering Column
Protector

No.1 Bracket

Column Tube Support

Ignition Switch

Tapered–Head Bolt

Tilt Steering Gear
Assembly with Motor

Turn Signal
Bracket

Key Interlock
Solenoid

Key Unlock Warning
Switch

Key Cylinder
Illumination

Key Cylinder

35 (360, 26)

N·m (kgf·cm, ft·lbf)

: Specified torque

Non–reusable part

20 (204, 15)

Tube Attachment

Column Upper
Bracket

Transponder Key coil

Transponder Key
Amplifier

Plate

Tilt Slider
Assembly

23 (230, 17)

Bushing

23 (230, 17)

Plate

Bushing

Washer

Washer

SR–10

–

STEERING

POWER TILT AND POWER TELESCOPIC STEERING
COLUMN

2180

RS01Y–06

–

SUPPLEMENTAL RESTRAINT SYSTEM

SRS AIRBAG

RS–1

2232

SRS AIRBAG

PRECAUTION

NOTICE:

The LEXUS GS 400/300 is equipped with SRS, which comprises a driver airbag, front passenger
airbag and side airbag. Failure to carry out service operations in the correct sequence could
cause the SRS to unexpectedly deploy during servicing, possibly leading to a serious accident.
Further, if a mistake is made in servicing the SRS, it is possible that the SRS may fail to operate
when required. Before performing servicing (including removal or installation of parts, inspec-
tion or replacement), be sure to read the following items carefully, then follow the correct proce-
dures described in the repair manual.

Malfunction symptoms of the SRS are difficult to confirm, so the DTCs become the most impor-
tant source of information when troubleshooting. When troubleshooting the SRS, always in-
spect the DTCs before disconnecting the battery.

Even in cases of a minor collision where the SRS does not deploy, the steering wheel pad, front
passenger airbag assembly, side airbag assembly, airbag sensor assembly, front airbag sen-
sor and side airbag sensor assembly should be inspected (See page

RS–15

,

RS–29

,

RS–42

,

RS–60

and

RS–65

).

Never use SRS parts from another vehicle. When replacing parts, replace them with new parts.

Never disassemble and repair the steering wheel pad, front passenger airbag assembly, side
airbag assembly, airbag sensor assembly, front airbag sensor or side airbag sensor assembly
in order to reuse it.

If the steering wheel pad, front passenger airbag assembly, side airbag assembly, airbag sen-
sor assembly, front airbag sensor or side airbag sensor assembly has been dropped, or if there
are cracks, dents or other defects in the case, bracket or connector, replace them with new
ones.

Use a volt/ohmmeter with high impedance (10 k

Ω

/V minimum) for troubleshooting the system’s

electrical circuits.

Information labels are attached to the periphery of the SRS components. Follow the instruc-
tions on the notices.

After work on the SRS is completed, perform the SRS warning light check or SRS side airbag
warning light check (See page

DI–552

).

If the vehicle is equipped with a mobile communication system, refer to the precaution in the
IN section.

CAUTION:

Work must be started after 90 seconds from when the ignition switch is turned to the ”LOCK”
position and the negative (–) terminal cable is disconnected from the battery.
(The SRS is equipped with a back–up power source so that if work is started within 90 seconds
from disconnecting the negative (–) terminal cable of the battery, the SRS may be deployed.)

When the negative (–) terminal cable is disconnected from the battery, the memory of the clock
and audio system will be canceled. So before starting work, make a record of the contents mem-
orized in the audio memory system. When work is finished, reset the audio systems as they
were before and adjust the clock. To avoid erasing the memory in each memory system, never
use a back– up power supply from outside the vehicle.

Before repairs, remove the airbag sensor if shocks are likely to be applied to the sensor during
repairs.

Do not expose the steering wheel pad, front passenger airbag assembly, side airbag assembly,
airbag sensor assembly, front airbag sensor or side airbag sensor assembly directly to hot air
or flames.