Lexus SC300 / Lexus SC400. Manual - part 58

(e)  Pull the wheel pad out from the steering wheel and

disconnect the airbag connector.

NOTICE: When removing the wheel pad, take care not to
pull the airbag wire harness.
CAUTION:

•

When storing the wheel pad, keep the upper surface of
the pad facing upward (See pages 

AB–3

, 4).

•

Never disassemble the wheel pad.

2. 

REMOVE STEERING WHEEL
(a)  Disconnect the connector.
(b)  Remove the set nut.
(c)  Place matchmarks on the steering wheel and main

shaft.

(d)  Using SST, remove the steering wheel.
SST 09213–31021

3. 

REMOVE AND INSTALL SPIRAL CABLE FROM/TO
COMBINATION SWITCH (See page 

BE–41

)

NOTICE: Do not disassemble the spiral cable or apply oil
to it.

4. 

CENTER SPIRAL CABLE
(a)  Check that the front wheels are facing straight ahead.
(b)  Turn the spiral cable counterclockwise by hand until it

becomes harder to turn the cable.

(c)  Then rotate the spiral cable clockwise about 3 turns to

align the red mark.

HINT: The spiral cable will rotate about 3 turns to either left
or right of the center.

5. 

INSTALL STEERING WHEEL
(a) Align 

matchmarks on the steering wheel and main shaft,

and install the steering wheel to the main shaft.

(b)  Install and torque the set nut.

Torque:    35 N

⋅

m (360 kgf

⋅

cm, 26 ft

⋅

lbf)

(c)  Connect the connector.

6. 

INSTALL STEERING WHEEL PAD
(a)  Connect the airbag connector.
(b) Install the wheel pad  after confirming  that the

circumference groove of the torx screws is caught on the
screw case.

(c)  Using a torx wrench, tighten the four screws.

Torque:    7.4 N

⋅

m (75 kgf

⋅

cm, 65 in.

⋅

lbf)

NOTICE:

•

Make sure the wheel pad is installed to the specified
torque.

•

If the wheel pad has been dropped, or there are cracks,
dents or other defects in the case or connector, replace
the wheel pad with a new one.

•

When installing the wheel pad, take care that the wirings
do not interfere with other parts and are not pinched
between other parts.

7. 

CHECK STEERING WHEEL CENTER POINT

AB–15

SRS

 AIRBAG   –   Removal and Installation of Component Parts

Front Airbag Sensor

Remove and install the parts as shown.

(MAIN POINTS OF REMOVAL AND
INSTALLATION)

CAUTION: Work must be started after approx. 20 se-
conds 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

).

NOTICE:

•

If the wiring connector of the airbag system is discon-
nected with the ignition switch at ON or ACC, diagnostic
codes will be recorded.

•

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

•

Never reuse the sensor involved in a collision when the
airbag has deployed.

•

Never repair a sensor in order to reuse it.

AB–16

SRS

 AIRBAG   –   Removal and Installation of Component Parts

INSTALL FRONT AIRBAG SENSOR

Install the sensor with the arrow on the sensor facing toward
the front of the vehicle.

Torque:    25 N

⋅

m (260 kgf

⋅

cm, 19 ft

⋅

lbf)

NOTICE:

•

Make sure the sensor is installed to the specified torque.

•

If the sensor has been dropped, or there are cracks, dents
or other defects in the case, bracket or connector, replace
the sensor with a new one.

•

The sensor set bolts have been anti–rust treated. When
the sensor is removed, always replace the set bolts with
new ones.

•

After installation, shake the sensor to check that there is
no looseness.

•

The front sensor is equipped with an electrical
connection check mechanism. Be sure to lock this
mechanism securely when connecting the connector. If
the connector is not securely locked, a malfunction code
will be detected by the diagnosis system.

•

Check that the dimensions of the body where the front
airbag sensor is installed match those in the body
dimension drawings on page 

BO–133

.

(The airbag may malfunction, or may not work, if the
mounting angle or dimensions of the sensor mount
are not correct.)

AB–17

SRS

 AIRBAG   –   Removal and Installation of Component Parts

Center Airbag Sensor Assembly

Remove and install the parts as shown.

AB–18

SRS

 AIRBAG   –   Removal and Installation of Component Parts