2003 TOYOTA LAND CRUISER sensor

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—Front seat belt pretensioners
The driver and front passenger ’s seat
belt pretensioners are designed to be
activated in response to a severe fron-
tal impact or a vehicle rollover.
When the airbag sensor detects the shock
of a severe frontal impact or a vehicle
rollover, the front seat belts are quickly
drawn back by the retractor so that the
belts snugly restrain the front seat occu-
pants.
The front seat belt pretensioners are acti-
vated even with no passenger in the front
seat.Collisions occurring at certain s
peeds and
angles may cause the seat belt preten-
sioners and SRS airbags not to operate
all together.Roll sensing of curtain shield airbags off
indicator light
The seat belt pretensioners will not oper-
ate in a vehicle rollover if the roll sensing
of curtain shield airbags off indicator light
is on. For details, see ”Roll sensing of
curtain shield airbags off switch” on page
65.

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CAUTION
Make sure the roll sensing of cur-
tain shield airbags off indicator
light is not on.
When the roll sensing of curtain
shield airbags off switch is turned
on (and the roll sensing of curtain
shield airbags off indicator light is
on), the seat belt pretensioners will
not operate in a vehicle rollover
and turning off the seat belt preten-
sioners can reduce the occupant
protection which your vehicle safety
systems can provide to you in cer-
tain accidents and increase the like-
lihood of death or serious injuries.
This indicator comes on when the igni-
tion key is turned to the ”ON” 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 sen-
sors, side and curtain shield airbag sensor
assemblies, curtain shield airbag sensor
assemblies, driver ’s seat position sensor,
driver ’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 buzzers”
on page 118.)The front seat belt pretensioner system
mainly consists of the following compo-
nents, and their locations are shown in
the illustration.1. Front airbag sensors
2. SRS warning light
3. Seat belt pretensioner assemblies
4. Airbag sensor assembly
The front seat belt pretensioners are con-
trolled by the airbag sensor assembly. The
airbag sensor assembly consists of a saf-
ing sensor and airbag sensor.

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When the front seat belt pretensioners are
activated, an operating noise may be
heard and a small amount of smokelike
gas may be released. This gas is harm-
less and does not indicate that a fire is
occurring.
Once the front seat belt pretensioners
have been activated, the seat belt retrac-
tors remain locked.
CAUTION
Do not modify, remove, strike or
open the front seat belt pretension-
er assemblies, airbag sensor or sur-
rounding area or wiring. Doing any
of these may cause sudden opera-
tion of the front seat belt preten-
sioners or disable the system,
which could result in death or seri-
ous injury.
Do not use tires or wheels other
than the manufacturer ’s recom-
mended size. Such a use may cause
the curtain shield airbags and seat
belt pretensioners to inflate acci-
dentally, which could result in death
or serious injury. For details, see
”Checking and replacing tires” on
page 275.
Do not place luggage heavier than
specified on the roof luggage carri-
er. Such luggage may cause the
curtain shield airbags and seat belt
pretensioners to inflate accidentally,
which could result in death or seri-
ous injury. For details, see ”Roof
luggage carrier” on page 188.
Do not modify or change the sus-
pension system. Such changes may
cause the curtain shield airbags to
inflate accidentally, which could re-
sult in death or serious injury.
Failure to follow these instructions
can result in death or serious inju-
ries. Consult your Toyota dealer be-
fore performing any repairs and modi-
fications.
NOTICE
Do not perform any of the following
changes without first consulting your
Toyota dealer. Such changes can
interfere with proper operation of the
front seat belt pretensioners in some
cases.
 Installation of electronic devices
such as a mobile twoway radio,
cassette tape player or compact
disc player
 Repairs on or near the front seat
belt retractor assemblies
 Modification of the front end struc-
ture
 Attachment of a grille guard (bull
bar, kangaroo bar, etc.), snowplow,
winches or any other equipment to
the front end
 Repairs made on or near the front
fenders, front end structure or con-
sole

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The SRS (Supplemental Restraint Sys-
tem) front airbags are designed to pro-
vide further protection for the driver
and front passenger in addition to the
primary safety protection provided by
the seat belts.
In response to a severe frontal impact,
the SRS front airbags work together with
the seat belts to help reduce injury by
inflating. The SRS front airbags help to
reduce injuries mainly to the driver ’s or
front passenger ’s head or chest directly
hitting the steering wheel or dashboard.
The front passenger airbag is activated
even with no passenger in the front seat.
Be sure to wear your seat belt properly.Your vehicle is equipped with a crash
sensing and diagnostic module, which will
record the use of the seat belt restraint
system by the driver when the SRS front
airbags are inflated.
CAUTION
A driver or front passenger who is
too close to the steering wheel or
dashboard during airbag deployment
can be killed or seriously injured.
Toyota strongly recommends that:
The driver sit as far back as pos-
sible from the steering wheel while
still maintaining control of the ve-
hicle.
The front passenger sit as far back
as possible from the dashboard.
All vehicle occupants be properly
restrained using the available seat
belts.
This indicator comes on when the igni-
tion key is turned to the ”ON” position.
It goes off after about 6 seconds. This
means the SRS front airbags are oper-
ating properly.
This warning light system monitors the
airbag sensor assembly, front airbag sen-
sors, side and curtain shield airbag sen-
sors assembly, curtain shield airbag sen-
sor assemblies, driver’s seat position
sensor, driver ’s seat belt buckle switch,
front seat belt pretensioner assemblies,
inflators, warning light, interconnecting wir-
ing and power sources. (For details, see
”Service reminder indicators and warning
buzzers” on page 118.)
SRS driver and front
passenger airbags

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The SRS front airbag system mainly con-
sists of the following components, and
their locations are shown in the illustra-
tion.1. Front airbag sensors
2. SRS warning light
3. Airbag module for front passenger (airbag and inflator)
4. Airbag sensor assembly
5. Airbag module for driver (airbag and inflator)
6. Driver ’s seat position sensor
7. Driver ’s seat belt buckle switch
The airbag sensor assembly consists of a
safing sensor and airbag sensor. The 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 air
bags with nontox-
ic gas to help restrain the forward motion
of the occupants. The 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
fairly loud noise and release some smoke
and residue along with nontoxic gas. This
does not indicate a fire. This gas is nor-
mally harmless; however, for those who
have delicate skin, it may cause a minor
skin irritation. Be sure to wash off any
residue as soon as possible to prevent
any potential skin irritation. Deployment of the airbags happens in a
fraction of a second, so the airbags must
inflate with considerable force. While the
system is desi
gned to reduce serious inju-
ries, 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 seri-
ous 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 ve-
hicle.
Parts of the airbag module (steering wheel
hub, airbag cover and inflator) may be hot
for several minutes after deployment, so
do not touch! The airbags inflate only
once. The windshield may be damaged by
absorbing some of the force of the inflat-
ing airbag.

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Do not allow a child to stand up or
kneel on the front passenger seat.
The front passenger airbag inflates
with considerable speed and force
and the child may be killed or seri-
ously injured.
Do not hold a child on your lap or
in your arms. Use a child restraint
system in the rear seat. For instruc-
tions concerning the installation of
a child restraint system, see ”Child
restraint” on page 74.
Do not put objects or your pets on
or in front of the dashboard or
steering wheel pad that houses the
front airbag system. They might re-
strict inflation or cause death or
serious injury as they are projected
rearward by the force of deploying
airbags. Likewise, the driver and
front passenger should not hold ob-
jects in their arms or on their
knees.
Do not modify or remove any wir-
ing. Do not modify, remove, strike
or open any components such as
the steering wheel pad, steering
wheel, column cover, front passen-
ger airbag cover, front passenger
airbag or airbag sensor assembly.
Doing so may cause sudden SRS
airbag inflation or disable the sys-
tem, which could result in death or
serious injury.
Failure to follow these instructions
can result in death or serious injury.
Consult your Toyota dealer before
performing any repairs and modifica-
tions.

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This indicator comes on when the igni-
tion key is turned to the ”ON” position.
It goes off after about 6 seconds. This
means the SRS side and curtain shield
airbags are operating properly.
This warning light system monitors the
airbag sensor assembly, front airbag sen-
sors, side and curtain shield airbag sensor
assemblies, curtain shield airbag sensor
assemblies, driver ’s seat position sensor,
driver ’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 buzzers”
on page 118.)The SRS side airbags may not inflate if
the vehicle is subjected to a collision
from the side at certain angles, or a
collision to the side of the vehicle body
other than the passenger compartment
as shown in the illustration.
The SRS side airbags are designed to
inflate when the passenger compartment
area suffers a severe impact from the
side.
For the safety of all occupants, always
wear your seat belts properly.
Collision from the rear
Collision from the front Vehicle rollover
The SRS side airbags are not designed
to inflate if the vehicle is involved in a
front or rear collision, if it rolls over,
or if it is involved in a lowspeed side
collision.

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Hitting a curb, edge of
pavement or hard sur-
faceFalling into or jump-
ing over a deep hole
Landing hard or vehicle falling
The SRS side and curtain shield airbags
may deploy if a severe impact occurs
to the underside of your vehicle. Some
examples are shown in the illustration.The main components of the SRS side
and curtain shield airbag system and their
locations are shown in the illustration
above.
1. SRS warning light
2. Curtain shield airbag modules (airbag and inflator)
3. Side airbag modules (airbag and inflator)
4. Curtain shield airbag sensor assembly
5. Side and curtain shield airbag sensor assembly
6. Airbag sensor assembly The SRS side 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 triggers the
side and curtain shield airbag inflators.
Then a chemical reaction in the inflators
quickly fills the air
bags with nontoxic gas
to help restrain the lateral motion of front
and second seat occupants.
In a vehicle rollover, the airbag sensor
assembly triggers the curtain shield airbag
inflator. At this time, a chemical reaction
in the inflators quickly fills the air bags
with nontoxic gas to help restrain the
lateral motion of the occupants.
When the airbags inflate, they produce a
fairly loud noise and release some smoke
and residue along with nontoxic gas. This
does not indicate a fire. This gas is nor-
mally harmless; however, for those who
have delicate skin, it may cause a minor
skin irritation. Be sure to wash off any
residue as soon as possible to prevent
any potential skin irritation.