Lexus ES300 (2002 year). Service manual - part 90
BODY ELECTRICAL – ACCESSORIES
BE-54
208BE59
Collision
Impact
Collision
Impact
Front Airbag Sensors
Seat Position
Sensor (Driver)
Airbag Sensor
Assembly
Side and
Curtain
Shield Airbag
Sensor
Assembly
Driver
Seat Belt
Buckle Switch
Curtain
Shield Airbag
Sensor
Assembly
Inflator (For Driver and
Front Passenger)
Seat Belt Pretensioner
(LH and RH)
Inflator
(For Left Side and
Left Curtain Shield)
Inflator
(For Right Side and
Right Curtain Shield)
Inflator
(For Left Curtain Shield)
Inflator
(For Right Curtain Shield)
SRS AIRBAG SYSTEM
1. General
The SRS (Supplemental Restraint System) airbag are provided for the driver and front passenger. The SRS
airbags have been designed to help reducing the shocks to the heads and chests of the driver and front pas-
senger in the event of a severe frontal impact collision as supplements to the seat belts.
This system is a 3-sensor type airbag system to detect the impact during a front collision using the airbag
sensor assembly and front airbag sensors, and to make the airbag system and seat belt pretensioner operate
as well.
On the ’02 ES300, the previous mechanical type front airbag sensor assembly (consisting of movable and
stationary contact points) has been changed to an electrical (deceleration sensor) type front airbag sensor
assembly.
Dual-stage SRS airbags system, that controls the airbag inflating output optimum by judging the extent
of impact, seat position and whether or not the seat belt is fasten, has been adopted for the driver and front
passenger airbags.
In accordance with the adoption of the dual-stage SRS airbags system, a seat position sensor has been es-
tablished for the driver seat.
On the ’02 ES300, a curtain shield airbag system that helps reduce the impact applied to the front and rear
seat occupants with a single curtain shield airbag has been adopted.
In conjunction with this system, a side and curtain shield airbag sensor assembly has been provided at the
bottom of the center pillar and a curtain shield airbag sensor assembly at the bottom of the rear pillar.
In this system, a front side collision is detected by the side and curtain shield airbag sensor assembly in
order to simultaneously deploy the side and curtain shield airbags. A rear side collision is detected by the
curtain shield airbag sensor assembly and the airbag sensor assembly in order to deploy only the curtain
shield airbag.
The function of the airbag sensor assembly to memorize the driver and front passenger’s seat belt wearing
condition while inflating the airbag is added.
System Diagram