2004 Lexus ES330 warning

OCCUPANT RESTRAINT SYSTEM
120
Seat belt pretensioners
The driver and front passenger's seat belt pretensioners
are designed to be activated in response to a severe
frontal impact.
When the sensor detects a severe frontal impact, the front seat
belts are quickly drawn back by the retractors so that the belts
snugly restrain the front seat occupants.
The front passengers's seat belt pretensioner will not activate
if no passenger is detected in the front passenger seat by the
front passenger occupant classification system. However, the
front passenger's seat belt pretensioner may activate if
luggage is put on the seat, or the seat belt is buckled up
regardless of the presence of an occupant in the seat. (As for
the front passenger occupant classification system, see page
152.)
The seat belt pretensioners and SRS airbags may not operate
together in case of collisions at a certain speeds and angles.
16E544

1Front passenger occupant classification system
(ECU and sensors)
2Front seat belt pretensioner assemblies
3SRS warning light
4Front passenger's seat belt buckle switch
5Front airbag sensors
6Airbag sensor assembly

OCCUPANT RESTRAINT SYSTEM
123
This indicator comes on when the ignition key is turned to
the ONº position. It goes off after about 6 seconds. This
means the front seat belt pretensioners are operating
properly.
This warning light system monitors the airbag sensor
assembly, front airbag sensors, side and curtain shield airbag
sensor assemblies, curtain shield airbag sensor assemblies,
driver's seat position sensor, driver's seat belt buckle switch,
front passenger occupant classification system, AIRBAG
OFFº indicator light, AIRBAG ONº indicator light, front
passenger's seat belt buckle switch, front seat belt
pretensioner assemblies, inflators, warning light,
interconnecting wiring and power sources. (For details, see
Service reminder indicators and warning buzzersº on page 55
for instructions.)If any of the following conditions occurs, this indicates a
malfunction of the airbags or seat belt pretensioners. Contact
your Lexus dealer as soon as possible.
When the ignition switch is turned to the ONº position, the
light does not come on or remains on.
The light comes on while driving.
If either front seat belt does not retract or cannot be pulled
out due to a malfunction or activation of the relevant front
seat belt pretensioner.
The seat belt pretensioner assembly or surrounding area
has bees damaged.

OCCUPANT RESTRAINT SYSTEM
128

1Front passenger occupant classification system
(ECU and sensors)
2Airbag module for front passenger
(airbag and inflator)
3SRS warning light
4Airbag module for driver (airbag and inflator)
5Driver's seat position sensor
6Driver's seat belt buckle switch
7Front passenger's seat belt buckle switch
8AIRBAG OFFº and AIRBAG ONº indicator lights
9Front airbag sensors
10Airbag sensor assembly
The SRS front airbag system consists mainly of the above
components, and their locations are shown in the illustration.
The airbag sensor assembly consists of a safing sensor and
airbag sensor.The front airbag sensors constantly monitor the forward
deceleration of the vehicle. If an impact results in a forward
deceleration beyond the designed threshold level, the system
triggers the airbag inflators. At this time a chemical reaction in
the inflators very quickly fills the airbags with non-toxic gas to
help restrain the forward motion of the occupants. The front
airbags then quickly deflate, so that there is no obstruction of
the driver's vision should it be necessary to continue driving.
When the airbags inflate, they produce a loud noise and
release some smoke and residue along with non-toxic gas.
This does not indicate a fire. This smoke may remain inside the
vehicle for some time, and may cause some minor irritation to
the eyes, skin or breathing. Be sure to wash off any residue as
soon as possible to prevent any potential skin irritation with
soap and water. If you safely exit from the vehicle, you should
do so immediately.
Deployment of the airbags happens in a fraction of a second,
so the airbags must inflate with considerable force. While the
system is designed to reduce serious injuries, primarily to the
head and chest, it may also cause other, less severe injuries
to the face, chest, arms and hands. These are usually in the
nature of minor burns or abrasions and swelling, but the force
of a deploying airbag can cause more serious injuries,
especially if an occupant's hands, arms, chest or head are in
close proximity to the airbag module at the time of deployment.
This is why it is important for the occupant to: avoid placing any
object or part of the body between the occupant and the airbag
module; sit straight and well back into the seat; wear the
available seat belt properly; and sit as far as possible from the
airbag module, while still maintaining control of the vehicle.

OCCUPANT RESTRAINT SYSTEM
134
The indicator comes on when the ignition key is turned to
the ONº position. It goes off after about 6 seconds. This
means the SRS front airbags are operating properly.
This warning light system monitors the airbag sensor
assembly, front airbag sensors, side and curtain shield airbag
sensor assemblies, curtain shield airbag sensor assemblies,
driver's seat position sensor, driver's seat belt buckle switch,
front passenger occupant classification system, AIRBAG
OFFº indicator light, AIRBAG ONº indicator light, front
passenger's seat belt buckle switch, front seat belt
pretensioner assemblies, inflators, warning light,
interconnecting wiring and power sources. (For details, see
Service reminder indicators and warning buzzersº on page 55
for instructions.)If any of the following conditions occurs, this indicates a
malfunction of the airbags or seat belt pretensioners. Contact
your Lexus dealer as soon as possible.
When the ignition key is turned to the ONº position, the light
does not come on or remains on.
The light comes on while driving.

OCCUPANT RESTRAINT SYSTEM
140
16E557

1Front passenger occupant classification system
(ECU and sensors)
2Side and curtain shield airbag sensor assemblies
3Side airbag modules (airbag and inflator)
4Curtain shield airbag modules (airbag and inflater)
5Curtain shield airbag sensor assemblies
6SRS warning light
7Front passenger's seat belt buckle switch
8AIRBAG OFFº and AIRBAG ONº indicator lights
9Airbag sensor assembly
The SRS side airbag and curtain shield airbag system consists
mainly of the above components, and their locations are shown
in the illustration.
The SRS side airbag and curtain shield airbag system is
controlled by the airbag sensor assembly. The airbag sensor
assembly consists of a safing sensor and airbag sensor.
In a severe side impact, the side and curtain shield airbag
sensor and/or the curtain shield airbag sensor trigger(s) the
side airbag inflators and/or the curtain shield airbag inflators.
At this time a chemical reaction in the inflators quickly fills the
airbags with non-toxic gas to help restrain the lateral motion
of the occupants.

OCCUPANT RESTRAINT SYSTEM
149
The indicator comes on when the ignition key is turned to
the ONº position. It goes off after about 6 seconds. This
means the SRS side airbags and curtain shield airbags are
operating properly.
This warning light system monitors the airbag sensor
assembly, front airbag sensors, side and curtain shield airbag
sensor assemblies, curtain shield airbag sensor assemblies,
driver's seat position sensor, driver's seat belt buckle switch,
front passenger occupant classification system, AIRBAG
OFFº indicator light, AIRBAG ONº indicator light, front
passenger's seat belt buckle switch, front seat belt
pretensioner assemblies, inflators, warning light,
interconnecting wiring and power sources. (For details, see
Service reminder indicators and warning buzzersº on page 55
for instructions.)If any of the following conditions occurs, this indicates a
malfunction of the airbags or seat belt pretensioners. Contact
your Lexus dealer as soon as possible.
When the ignition key is turned to the ONº position, the light
does not come on or remains on.
The light comes on while driving.

OCCUPANT RESTRAINT SYSTEM
153 To ensure the system correctly detects an adult sitting in the
front passenger seat, make sure the above do not occur.
Make sure the AIRBAG ONº indicator light is illuminated when
an adult is seated in the front passenger seat. If the AIRBAG
OFFº indicator light is illuminated, ask the passenger to sit up
straight, well back in the seat, and with the seat belt worn
correctly. If the AIRBAG OFFº indicator light still remains
illuminated, either ask the passenger to move to the rear seat,
or if that is not possible, move the front passenger seat fully
rearward.
The AIRBAG OFFº and AIRBAG ONº indicator lights will
be initially illuminated when the ignition switch is turned
to the ONº position. It will remain for about four seconds
and then go off. After the two seconds, the front
passenger occupant classification system operates and
judges which indicator light to turn on.
The SRS warning light and AIRBAG OFFº indicator light
will be illuminated if there is a malfunction in the front
passenger occupant classification system.

OCCUPANT RESTRAINT SYSTEM
154
Condition and operation in the front passenger occupant classification system
Indicator/warning lightDevices
Condition detected
by the front
passenger occupant
classification systemAIRBAG
OFFº and
AIRBAG
ONº
indicator
lights
SRS
warning light
Front
passenger's
seat belt
reminder
light
Front
passenger
airbagSide airbag
on the front
passenger
seatCurtain
shield airbag
in the front
passenger
sideFront
passenger's
seat belt
pretensioner
1Adult*1AIRBAG
ONºOFFFlashing*4Activated
2Child *2 or child
restraint system*3AIRBAG
OFFºOFFFlashing*4DeactivatedActivated
3UnoccupiedNot
illuminatedOFFOFFDeactivatedActivatedDeactivated
4There is a
malfunction in the
systemAIRBAG
OFFºONOFFDeactivatedActivated
*1: The system judges a person of adult size as an adult. When a smaller adult sits in the front passenger seat, the system may
recognize him/her as a child depending on his/her physique and posture.
*
2: When a larger child who has outgrown a child restraint system sits in the front passenger seat, the system may recognize him/her
as an adult depending on his/her physique or posture.
*
3: Never install a rear-facing child restraint system on the front passenger seat. A forward-facing child restraint system should
only be installed on the front passenger seat when it is unavoidable. (See Child restraint systemº on page 158 as for installing
the child restraint system.)
*
4: In the event the front passenger does not wear a seat belt.