2021 LEXUS RX450h Owners Manual

251-1. For safe use
1
For safety and security
Adjust the angle of the seatback so
that you are sitting straight up and
so that you do not have to lean for-
ward to steer. (P.131)
Adjust the seat so that you can
depress the pedals fully and so that
your arms bend slightly at the
elbow when gripping the steering
wheel. ( P.131)
Lock the head restraint in place
with the center of the head restraint
closest to the top of your ears.
( P.145)
Wear the seat belt correctly.
( P.26) Make sure that all occupants are wear-
ing their seat belts before driving the
vehicle. (
P.26)
Use a child restraint system appropri-
ate for the child until the child becomes
large enough to properly wear the
vehicle’s seat belt. ( P.45)
Make sure that you can see backward
clearly by adjusting the inside and out-
side rear view mirrors properly.
( P.149, 150)
For safe driving
For safe driving, adjust the seat and
mirror to an appropriate position
before driving.
Correct driving posture
WARNING
■For safe driving
Observe the following precautions.
Failure to do so may result in death or
serious injury.
A
B
C
D
●Do not adjust the position of the
driver’s seat while driving.
Doing so could cause the driver to lose
control of the vehicle.
●Do not place a cushion between the
driver or passenger and the seatback.
A cushion may prevent correct pos-
ture from being achieved, and reduce
the effectiveness of the seat belt and
head restraint.
●Do not place anything under the front
seats.
Objects placed under the front seats
may become jammed in the seat
tracks and stop the seat from locking in
place. This may lead to an accident
and the adjustment mechanism may
also be damaged.
●Always observe the legal speed limit
when driving on public roads.
●When driving over long distances, take
regular breaks before you start to feel
tired.
Also, if you feel tired or sleepy while
driving, do not force yourself to con-
tinue driving and take a break immedi-
ately.
Correct use of the seat belts
Adjusting the mirrors

261-1. For safe use
Seat belts
Make sure that all occupants are
wearing their seat belts before driv-
ing the vehicle.
WARNING
Observe the following precautions to
reduce the risk of injury in the event of
sudden braking, sudden swerving or an
accident.
Failure to do so may cause death or seri-
ous injury.
■Wearing a seat belt
●Ensure that all passengers wear a seat
belt.
●Always wear a seat belt properly.
●Each seat belt should be used by one
person only. Do not use a seat belt for
more than one person at once, includ-
ing children.
●Lexus recommends that children be
seated in the rear seat and always use
a seat belt and/or an appropriate child
restraint system.
●To achieve a proper seating position,
do not recline the seat more than nec-
essary. The seat belt is most effective
when the occupants are sitting up
straight and well back in the seats.
●Do not wear the shoulder belt under
your arm.
●Always wear your seat belt low and
snug across your hips.
●RX450hL: Do not let third-row seat
passengers to use second-row seat
seat belts.
■Pregnant women
Obtain medical advice and wear the seat
belt in the proper way. (
P.27)
Women who are pregnant should posi-
tion the lap belt as low as possible over
the hips in the same manner as other
occupants, extending the shoulder belt
completely over the shoulder and avoid-
ing belt contact with the rounding of the
abdominal area.
If the seat belt is not worn properly, not
only the pregnant woman, but also the
fetus could suffer death or serious injury
as a result of sudden braking or a colli-
sion.
■People suffering illness
Obtain medical advice and wear the seat
belt in the proper way. (
P.27)
■When children are in the vehicle
 P.54

271-1. For safe use
1
For safety and security
Extend the shoulder belt so that it
comes fully over the shoulder, but
does not come into contact with the
neck or slide off the shoulder.
 Position the lap belt as low as possi- ble over the hips.
 Adjust the position of the seatback.
Sit up straight and well back in the
seat.
 Do not twist the seat belt.
■Child seat belt usage
The seat belts of your vehicle were princi-
pally designed for persons of adult size.
●Use a child restraint system appropriate
for the child, until the child becomes large
enough to properly wear the vehicle’s
seat belt. ( P.45)
●When the child becomes large enough to
properly wear the vehicle’s seat belt, fol-
low the instructions regarding seat belt
usage. ( P.26)
■Seat belt extender
If your seat belts cannot be fastened
securely because they are not long enough,
a personalized seat be lt extender is avail-
able from your Lexus dealer free of charge.
WARNING
■Seat belt damage and wear
●Do not damage the seat belts by allow-
ing the belt, plate, or buckle to be
jammed in the door.
●Inspect the seat be lt system periodi-
cally. Check for cuts, fraying, and loose
parts. Do not use a damaged seat belt
until it is replaced . Damaged seat belts
cannot protect an occupant from
death or serious injury.
●Ensure that the belt and plate are
locked and the belt is not twisted.
If the seat belt do es not function cor-
rectly, immediately contact your Lexus
dealer.
●Replace the seat a ssembly, including
the belts, if your vehicle has been
involved in a serious accident, even if
there is no obvious damage.
●Do not attempt to install, remove,
modify, disassemble or dispose of the
seat belts. Have an y necessary repairs
carried out by your Lexus dealer. Inap-
propriate handling may lead to incor-
rect operation.
Correct use of the seat belts
WARNING
■Using a seat belt extender
Observe the following precautions to
reduce the risk of in jury in the event of
sudden braking, sudden swerving or an
accident.
Failure to do so may cause death or seri-
ous injury.
●Do not wear the seat belt extender if
you can fasten the seat belt without the
extender.

281-1. For safe use
1To fasten the seat belt, push the
plate into the buckle until a click
sound is heard.
2 To release the seat belt, press the
release button .
■Emergency locking retractor (ELR)
The retractor will lock the belt during a sud-
den stop or on impact. It may also lock if you
lean forward too quickly. A slow, easy motion will allow the belt to extend so that
you can move around fully.
■Automatic locking retractor (ALR)
When a passenger’s shoulder belt is com-
pletely extended and then retracted even
slightly, the belt is lock ed in that position and
cannot be extended. This feature is used to
hold the child restraint system (CRS) firmly.
To free the belt again, fully retract the belt
and then pull the belt out once more.
(  P.45)
1 Push the seat belt shoulder anchor
down while pressing the release
button .
2 Push the seat belt shoulder anchor
up while pressing the release but-
ton .
Move the height adjuster up and down as
needed until you hear a click.
WARNING
●Do not use the seat belt extender
when installing a child restraint system
because the belt will not securely hold
the child restraint system, increasing
the risk of death or serious injury in the
event of an accident.
●The personalized extender may not be
safe on another vehicle, when used by
another person, or at a different seat-
ing position other than the one origi-
nally intended.
NOTICE
■When using a seat belt extender
When releasing the se at belt, press on
the buckle release button on the
extender, not on the seat belt.
This helps prevent damage to the vehicle
interior and the extender itself.
Fastening and releasing the seat
belt
A
Adjusting the seat belt shoulder
anchor height (front seats)
WARNING
■Adjustable shoulder anchor
Always make sure the shoulder belt is
positioned across the center of your
shoulder. The belt should be kept away
from your neck, but not falling off your
shoulder. Failure to do so could reduce
the amount of protection in an accident
and cause death or serious injuries in the
event of a sudden stop, sudden swerve or
accident.
A
A

291-1. For safe use
1
For safety and security
The pretensioners help the seat belts to
quickly restrain the occupants by
retracting the seat belts when the vehi-
cle is subjected to certain types of
severe frontal or side collision or a
vehicle rollover.
The pretensioners do not activate in the
event of a minor frontal impact, a minor
side impact or a rear impact.
■Replacing the belt after the preten-
sioner has been activated
If the vehicle is involv ed in multiple colli-
sions, the pretensioner will activate for the
first collision, but will not activate for the
second or subsequent collisions.
Seat belt pretensioners (front
seats and outboard second-row
seats)
WARNING
■Seat belt pretensioners
Observe the following precautions to
reduce the risk of injury in the event of
sudden braking, sudd en swerving or an
accident.
Failure to do so may cause death or seri-
ous injury.
●Do not place anything, such as a cush-
ion, on the front passenger’s seat.
Doing so will disperse the passenger’s
weight, which prevents the sensor
from detecting the passenger’s weight
properly. As a result , the seat belt pre-
tensioner for the front passenger’s seat
may not activate in the event of a colli-
sion.
●If the pretensioner has activated, the
SRS warning light will come on. In that
case, the seat belt cannot be used
again and must be replaced at your
Lexus dealer.

301-1. For safe use
■Location of the SRS airbags
RX450h
SRS front airbagsSRS driver airbag/front passenger airbag
Can help protect the head and chest of the driver and front passenger from impact with
interior components
SRS knee airbag
Can help provide driver protection
SRS seat cushion airbag
Can help restrain the front passenger
SRS side and curtain shield airbagsSRS front side airbags
Can help protect the torso of the front seat occupants
SRS airbags
The SRS airbags inflate when the vehicle is subjected to certain types of severe
impacts that may cause significant injury to the occupants. They work together
with the seat belts to help reduce the risk of death or serious injury.
SRS airbag system
A
B
C
D

311-1. For safe use
1
For safety and security
SRS rear side airbags
Can help protect the torso of occupants in the rear outer seats
SRS curtain shield airbags
• Can help protect primarily the head of occupants in the outer seats
• Can help prevent the occupants from being thrown from the vehicle in the event of vehi- cle rollover
RX450hL
SRS front airbags
SRS driver airbag/front passenger airbag
Can help protect the head and chest of the driver and front passenger from impact with
interior components
SRS knee airbag
Can help provide driver protection
SRS seat cushion airbag
Can help restrain the front passenger
SRS side and curtain shield airbags
SRS front side airbags
Can help protect the torso of the front seat occupants
SRS rear side airbags
Can help protect the torso of occupants in the outboard second-row seats
E
F
A
B
C
D
E

321-1. For safe use
SRS curtain shield airbags
• Can help protect primarily the head of occupants in the outer seats
• Can help prevent the occupants from being thrown from the vehicle in the event of vehi- cle rollover
■SRS airbag system components
Front passenger airbag
“AIR BAG ON” and “AIR BAG OFF” indicator lights
Front side airbags
Curtain shield airbags
Side impact sensors (rear)
SRS warning light
Front passenger occupant classifi cation system (ECU and sensors)
Driver airbag
Side impact sensors (front door)
Seat belt pretensioners and force limiters
Passenger seat cushion airbag
Driver’s seat position sensor
Driver’s knee airbag
Driver’s seat belt buckle switch
Front impact sensors
Airbag sensor assembly
RX450h: Rear side airbags
F
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q