airbag Lexus GX470 2005 Scheduled Maintenance Guide / LEXUS 2005 GX470 (OM60B11U) Workshop Manual

OCCUPANT RESTRAINT SYSTEMS
197
CAUTION
To avoid potential death or serious injury when the front
passenger occupant classification system does not
detect the conditions correctly, observe the following.
Wear the seat belt properly.
 Make sure the front passenger's seat belt tab has not
been left inserted into the buckle before someone
sits in the front passenger seat.
 Make sure the ªAIRBAG ONº indicator light is
illuminated when using the seat belt extender for the
front passenger seat. If the ªAIRBAG OFFº indicator
light is illuminated, disconnect the extender tongue
from the seat belt buckle, then reconnect the seat
belt. Reconnect the seat belt extender after making
sure the ªAIRBAG ONº indicator light is illuminated.
If you use the seat belt extender while the ªAIRBAG
OFFº indicator light is illuminated, the front
passenger airbag and side airbag on the front
passenger side may not activate correctly, which
could cause death or serious injury in the event of
collision.
Do not apply a heavy load to the front passenger seat
or equipment (e.g. armrest).
 Do not put weight on the front passenger seat by
putting your hands or feet on the front passenger
seat seatback from the rear passenger seat.
 Do not let a rear passenger lift the front passenger
seat with their feet or press on the seatback with their
legs.
 Do not put objects under the front passenger seat.
 Do not recline the front passenger seat seatback so
far that it touches a rear seat. This may cause the
ªAIRBAG OFFº indicator light to be illuminated,
which indicates that the passenger's airbags will not
deploy in the event of a severe accident. If the
seatback touches the rear seat, return the seatback
to a position where it does not touch the rear seat.
Keep the front passenger seatback as upright as
possible when the vehicle is moving. Reclining the
seatback excessively may lessen the effectiveness
of the seat belt system.

OCCUPANT RESTRAINT SYSTEMS
198
If an adult sits in the front passenger seat, the
ªAIRBAG ONº indicator light should be illuminated.
If the ªAIRBAG OFFº indicator is illuminated, ask the
passenger to sit up straight, well back in the seat, feet
on the floor, and with the seat belt worn correctly. If
the ªAIRBAG OFFº indicator still remain illuminated,
either ask the passenger to move to the rear seat, or
if that is not possible, move the front passenger seat
fully rearward.
 When it is unavoidable to install the forward±facing
child restraint system on the front passenger seat,
install the child restraint system on the front
passenger seat in the proper order. (As for the
installation order, see ªChild restraint systemº on
page 202.)
 Do not remove the seat.
 Do not kick the front passenger seat or subject it to
severe impact. Otherwise, the SRS warning light may
come on to indicate a malfunction of the detection
system. In this case, contact your Lexus dealer
immediately.
 Child restraint systems installed on the rear seat
should not contact the front seatbacks.In addition to the precautions outlined above, the ªAIRBAG
ONº indicator light may be illuminated when a child sits in the
front passenger seat or a forward±facing child restraint system
is installed on the front passenger seat. If the ªAIRBAG OFFº
indicator light is not illuminated in these circumstances, the
front passenger airbag and side airbag on the front passenger
side are in an activated condition Ð the airbags will deploy if
an impact meets the deployment criteria. Refer to all the
cautions in this Section and ªChild restraint systemº on page
202.

OCCUPANT RESTRAINT SYSTEMS
199
ROLL SENSING OF CURTAIN
SHIELD AIRBAGS OFF SWITCH
The roll sensing of curtain shield airbags off switch
(ªRSCA OFFº switch) can turn off the curtain shield
airbags and seat belt pretensioners in a vehicle rollover.
This switch should only be used if inflation is not desired
(such as extreme off±road driving).
When you push the ªRSCA OFFº switch for a few seconds with
the ignition switch on, the ªRSCA OFFº indicator light comes
on and the roll sensing function is turned off. When you push
the switch again, the indicator light goes off and the roll sensing
function is turned on. (For details about the roll sensing
function, see ªSRS side airbags and curtain shield airbagsº on
page 179.) In a severe side impact, the curtain shield airbags on impacted
side will inflate even if the roll sensing function is turned off.
(For details about the curtain shield airbags, see ªSRS side
airbags and curtain shield airbagsº on page 179.)
In a severe frontal impact, the seat belt pretensioners will work
even if the roll sensing function is turned off. (For details about
the seat belt pretensioners, see ªSeat belt pretensionersº on
page 162.)
If the ignition switch is turned to ªACCº or ªLOCKº with the\
roll
sensing
function off and then the ignition switch is turned back
to ªONº, the roll sensing function will turn back on
automatically.CAUTION
 Before normal driving, make sure the ªRSCA OFFº
indicator light is off.
 When the roll sensing function is turned off (and the
ªRSCA OFFº indicator light is on), the curtain shield
airbags and seat belt pretensioners will not work in
a vehicle rollover. Turning off the curtain shield
airbags and seat belt pretensioners reduces
occupant protection which your vehicle safety
systems can provide in accidents and increase the
likelihood of death or serious injuries.

OCCUPANT RESTRAINT SYSTEMS
201
Never install a rear±facing child restraint system on
the front passenger seat even if the ªAIRBAG OFFº
indicator light is illuminated. In the event of an
accident, the force of the rapid inflation of the front
passenger airbag can cause death or serious injury
to the child if the rear±facing child restraint system is
installed on the front passenger seat.
 A forward±facing child restraint system should be
allowed to be installed on the front passenger seat
only when it is unavoidable. Always move the seat as
far back as possible even if the ªAIRBAG OFFº
indicator light is illuminated, because the front
passenger airbag could inflate with considerable
speed and force. Otherwise, the child may be killed
or seriously injured.
 On vehicles with side airbags and curtain shield
airbags, do not allow the child to lean his/her head or
any part of his/her body against the door or the area
of the seat, front or rear pillar or roof side rail from
which the side airbags or curtain shield airbags
deploy even if the child is seated in the child restraint
system. It is dangerous if the side airbags and curtain
shield airbags inflate, and the impact could cause
death or serious injury to the child.

OCCUPANT RESTRAINT SYSTEMS
204INSTALLATION WITH 3±POINT TYPE SEAT BELT
(A) Infant seat installation
An infant seat must be used in rear±facing position only.
CAUTION

Never install a rear±facing child restraint system on
the front passenger seat even if the ªAIRBAG OFFº
indicator light is illuminated. In the event of an
accident the force of the rapid inflation of the front
passenger airbag can cause death or serious injury
to the child if the rear±facing child restraint system is
installed on the front passenger seat.

OCCUPANT RESTRAINT SYSTEMS
209
5. Fully extend the shoulder belt to put it in the lock mode.
When the belt is then retracted even slightly, it cannot be
extended. To hold the seat securely, make sure the belt is in
the lock mode before letting the belt retract.
6. While pressing the convertible seat firmly against the seat
cushion and seatback, let the shoulder belt retract as far as it
will go to hold the convertible seat securely.
CAUTION
Push and pull the child restraint system in different
directions to be sure it is secure. Follow all the
installation instructions provided by its manufacturer.
7. Put a child on the child restraint system and secure the child,
complying with the instructions provided by the child restraint
system manufacturer.
The ªAIRBAG OFFº indicator light should be illuminated when
the ignition key is ªONº and the child is in the child restraint
system after following these procedures. The ªAIRBAG OFFº
indicator light indicates the SRS front passenger airbag and
side airbag on the passenger side will not deploy. If the
ªAIRBAG ONº indicator light is illuminated, remove the child
restraint system and reinstall it with the ignition key in the
ªACCº or ªLOCKº position. If the ªAIRBAG ONº indicator light
still remains illuminated when the ignition key is turned to the
ªONº position, then the SRS front passenger airbag and side
airbag on the passenger side may deploy in an accident. Do
not drive the vehicle in this condition. Remove the child
restraint system and contact your Lexus dealer.
CAUTION
When it is unavoidable to install the forward±facing
child restraint system on the front passenger seat,
install
the child restraint system on the front passenger
seat in the proper order. Otherwise, the front passenger
occupant classification system can not detect the
presence of the child restraint system and the front
passenger airbag and side airbag on the front
passenger seat could deploy.

OCCUPANT RESTRAINT SYSTEMS
210
CAUTION
Never install a rear±facing child restraint system on
the front passenger seat even if the ªAIRBAG OFFº
indicator light is illuminated. In the event of an
accident the force of the rapid inflation of the front
passenger airbag can cause death or serious injury
to the child if the rear±facing child restraint system is
installed on the front passenger seat.

Move seat fully back

OCCUPANT RESTRAINT SYSTEMS
211
A forward±facing child restraint system should be
allowed to be installed on the front passenger seat
only when it is unavoidable. Always move the seat as
far back as possible even if the ªAIRBAG OFFº
indicator light is illuminated, because the front
passenger airbag inflate with considerable speed
and force. Otherwise, the child may be killed or
seriously injured.
 On vehicles with side airbags and curtain shield
airbags, do not allow the child to lean his/her head or
any part of his/her body against the door or the area
of the seat, front or rear pillar, or roof side rail from
which the side airbags or curtain shield airbags
deploy even if the child is seated in the child restraint
system. It is dangerous if the side airbag and curtain
shield airbag inflate, and the impact could cause
death or serious injury to the child.

OCCUPANT RESTRAINT SYSTEMS
216

Move seat fully back
CAUTION
A forward±facing child restraint system should be
allowed to be installed on the front passenger seat
only when it is unavoidable. Always move the seat as
far back as possible even if the ªAIRBAG OFFº
indicator light is illuminated, because the front
passenger airbag could inflate with considerable
speed and force. Otherwise, the child may be killed
or seriously injured.
 On vehicles with side airbags and curtain shield
airbags, do not allow the child to lean his/her head or
any part of his/her body against the door or the area
of the seat, front or rear pillar, or roof side rail from
which the side airbags or curtain shield airbags
deploy even if the child is seated in the child restraint
system. It is dangerous if the side airbag and curtain
shield airbag inflate, and the impact could cause
death or serious injury to the child.

ENGINE
553
FUEL PUMP SHUT OFF SYSTEM
The fuel pump shut off system stops supplying fuel to the
engine to minimize the risk of fuel leakage when the engine
stalls or an airbag inflates upon collision. To restart the engine
after the fuel pump shut off system activates, turn the ignition
switch to ªACCº or ªLOCKº once and start it.
CAUTION
Inspect the ground under the vehicle before restarting
the engine. If you find that liquid has leaked onto the
ground, it is the fuel system that has been damaged and
it is in need of repair. In this case, do not restart the
engine.
FACTS ABOUT ENGINE OILCONSUMPTION
Functions of engine oil
Engine oil has the primary function of lubricating and cooling
the inside of the engine, and plays a major role in maintaining
the engine in proper working order.
Engine oil consumption
It is normal that an engine should consume some engine
oil during normal engine operation. The causes of oil
consumption in a normal engine are as follows.
Oil is used to lubricate pistons, piston rings and cylinders.
A thin film of oil is left on the cylinder wall when a piston
moves downwards in the cylinder. High negative pressure
generated when the vehicle is decelerating sucks some of
this oil into the combustion chamber. This oil as well as
some part of the oil film left on the cylinder wall is burned by
the high temperature combustion gases during the
combustion process.
 Oil is also used to lubricate the stems of the intake valves.
Some of this oil is sucked into the combustion chamber
together with the intake air and is burned along with the fuel.
High temperature exhaust gases also burn the oil used to
lubricate the exhaust valve stems.