Lexus SC300 / Lexus SC400. Manual - part 777

STEERING WHEEL PAD (with AIRBAG)

RS00Q–07

1. 

When removing the steering wheel pad or handling a new steering wheel pad, it should be placed
with the pad top surface facing up.
In this case, the twin–lock type connector lock lever should be in the locked state and care should be taken
to place it so the connector will not be damaged. And do not store a steering wheel pad on top of another
one. (Storing the pad with its metallic surface up may lead to a serious accident if the airbag inflates for
some reason.

2. 

Never measure the resistance of the airbag squib. (This may cause the airbag to deploy, which is
very dangerous.)

3. 

Grease should not be applied to the steering wheel pad and the pad should not be cleaned with
detergents of any kind.

4. 

Store the steering wheel pad where the ambient temperature below 93

C (200

F), without high

humidity and away from electrical noise.

5. 

When using electric welding, first disconnect the SRS connector (yellow color and 2 pins) under
the steering column near the combination switch connector before starting work.

6. 

When disposing of a vehicle or the steering wheel pad alone, the airbag should be deployed using
an SST before disposal (See page 

RS–21

).

Perform the operation in a place away from electrical noise.

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SUPPLEMENTAL RESTRAINT SYSTEM

GENERAL DESCRIPTION

RS–3

SPIRAL CABLE (in COMBINATION SWITCH)

RS00P–06

The steering wheel must be fitted correctly to the steering column with the spiral cable at the neutral posi-
tion, otherwise cable disconnection and other troubles may result.
Refer to page 

RS–19

 of this manual concerning correct steering wheel installation.

FRONT PASSENGER AIRBAG ASSEMBLY

RS00N–07

1. 

Always store a removed or new front passenger airbag assembly with the airbag door facing up.
Store the airbag assembly with the airbag door facing down could cause a serious accident if the
airbag inflates.

2. 

Never measure the resistance of the airbag squib. (This may cause the airbag to deploy, which is
very dangerous.)

3. 

Grease should not be applied to the front passenger airbag assembly and the door should not be
cleaned with detergents of any kind.

4. 

Store the front passenger airbag assembly where the ambient temperature remains below 93

C

(200

F), without high humidity and away from electrical noise.

5. 

When using electric welding, first disconnect the SRS connector (yellow color and 2 pins) installed
on the glove compartment door finish plate at upper side of the glove compartment assembly
before starting work.

6. 

When disposing of a vehicle or the front passenger airbag assembly alone, the airbag should be
deployed using an SST before disposal (See page 

RS–34

). Perform the operation in a place away

from electrical noise.

RS–4

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SUPPLEMENTAL RESTRAINT SYSTEM

GENERAL DESCRIPTION

FRONT AIRBAG SENSOR

RS00N–07

1. 

Never reuse the front airbag sensor involved in a collision when the airbag has deployed. (Replace both
the left and right airbag sensors.)

2. 

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

3. 

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

4. 

The front airbag sensors 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 (See page 

RS–12

).

CENTER AIRBAG SENSOR ASSEMBLY

RSOOR–0A

1.  Never reuse the center airbag sensor assembly involved in a collision when the airbag has

deployed.

2. 

Work must be started after 90 seconds from the time the ignition switch is turned to LOCK position
and the negative (–) terminal cable is disconnected from the battery even just loosing the set bolts
of center airbag sensor assembly.

WIRE HARNESS AND CONNECTOR

RSO41–01

The SRS wire harness is integrated with the cowl wire harness assembly. The wires for the SRS wire har-
ness are encased in a yellow corrugated tube. All the connectors for the system are also a standard yellow
color. If the SRS wire harness becomes disconnected or the connector becomes broken due to an accident
etc., repair or replace it as shown on page 

RS–48

.

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SUPPLEMENTAL RESTRAINT SYSTEM

GENERAL DESCRIPTION

RS–5

DESCRIPTION

RS00S–02

The SRS (Supplemental Restraint System), together with the seat belt, is designed to help protect the driv-
er. Frontal inspect, the airbag sensor detect the shock, and if the front–to–rear shock is greater than a spe-
cified value, an airbag stored in the steering wheel pad is inflated instantaneously to help reduce the shock
to the driver.

LOCATION OF COMPONENTS

RS00T–02

RS–6

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SUPPLEMENTAL RESTRAINT SYSTEM

DESCRIPTION