Lexus SC300 / Lexus SC400. Manual - part 787

1. 

DISCONNECT NEGATIVE (–) TERMINAL CABLE FROM
BATTERY
CAUTION: Work must be started after 90 seconds from
the time the ignition switch is turned to the “LOCK” posi-
tion and the negative (–) terminal cable is disconnected
from the battery.
(See page 

RS–2

)

2. 

REMOVE ENGINE UNDER COVER
(See page 

BO–12

)

3. 

REMOVE FRONT AIRBAG SENSOR

(a)  Disconnect the connector.
(b)  Remove the bolt, the nut and the sensor.
4. 

INSTALL FRONT AIRBAG SENSOR

(a)  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, brackets or connector,

replace the sensor is removed, always replace the set bolt

and the nut with new one.

•

The sensor set bolt and the nut have been anti–rust

treated. When the sensor is removed, always replace the

set bolt and the nut 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 in the BODY section.

(The SRS may malfunction, or may not work, if the
dimensions of the sensor mount is not correct.)

5. 

INSTALL ENGINE UNDER COVER

6.  CONNECT NEGATIVE (–) TERMINAL CABLE TO

BATTERY

–

SUPPLEMENTAL RESTRAINT SYSTEM

FRONT AIRBAG SENSOR

RS–43

CENTER AIRBAG SENSOR
ASSEMBLY

INSPECTION ITEMS

RS047–01

1. 

VEHICLES NOT INVOLVED IN A COLLISION
Perform a diagnostic system check.
(See page 

RS–59

)

2. 

VEHICLES INVOLVED IN A COLLISION
IF THE SRS IS NOT DEPLOYED
Perform a diagnostic system check.
(See page 

RS–59

)

IF THE SRS IS DEPLOYED
Replace the center airbag sensor assembly.

REPLACEMENT REQUIREMENTS

RS019–06

In the following cases, replace the center airbag sensor as-
sembly.
NOTICE: For replacement of the center airbag sensor as-
sembly, see page 

RS–46

 “CENTER AIRBAG SENSOR

ASSEMBLY REMOVAL AND INSTALLATION” and be sure
to follow the correct procedure.

•

If the SRS has been deployed in a collision.

•

If the center airbag sensor assembly has been found to
be faulty in troubleshooting.

•

If the center airbag sensor assembly has been dropped.

RS–44

–

SUPPLEMENTAL RESTRAINT SYSTEM

CENTER AIRBAG SENSOR ASSEMBLY

COMPONENTS

RS048–01

–

SUPPLEMENTAL RESTRAINT SYSTEM

CENTER AIRBAG SENSOR ASSEMBLY

RS–45

CENTER AIRBAG SENSOR ASSEMBLY
REMOVAL AND INSTALLATION

RS049–01

NOTICE:

•

Do not open the cover or the case of the ECU and various

computers unless absolutely necessary. (If the IC

terminals are touched, the IC may be destroyed by static

electricity.)

•

Never use SRS parts from another vehicle. When

replacing parts, replace with new parts.

•

Never reuse the center airbag sensor assembly involved

in a collision when the airbag has deployed.

•

Never repair a sensor in order to reuse it.

1. 

DISCONNECT NEGATIVE (–) TERMINAL CABLE FROM
BATTERY
CAUTION: Work must be started after 90 seconds from
the time the ignition switch is turned to the LOCK posi-
tion and the negative (–) terminal cable is disconnected
from the battery (See page 

RS–2

).

2. 

REMOVE AND INSTALL CENTER AIRBAG SENSOR
ASSEMBLY

(a)  Using a torx wrench, loosen and tighten the 3 screws.

Torx wrench: T40 (Part No. 09042–00020 or locally manufac-
tured tool)

(b)  Disconnect and connect the connector.

NOTICE: Removal and installation of the connector is
done with the sensor assembly installed.

(c)  Using a torx wrench, tighten the 3 screws.

Torx wrench: T40 (Part No. 09042–00020 or locally manufac-
tured tool)

Torque: 15 N

⋅

m (150 kgf

⋅

cm, 11 ft

⋅

lbf)

NOTICE:

•

Make sure the sensor assembly is installed to the

specified torque.

•

If the sensor assembly has been dropped, or there are

cracks, dents or other defects in the case, bracket or

connector, replace the sensor assembly with a new one.

•

When installing the sensor assembly, take care that the

airbag wiring does not interfere with other parts and is

not pinched between other parts.

•

After installation, shake the sensor assembly to check

that there is no looseness.

RS–46

–

SUPPLEMENTAL RESTRAINT SYSTEM

CENTER AIRBAG SENSOR ASSEMBLY