2021 LEXUS NX300h ECU

451-1. For safe use
LEXUS NX300h Owners Manual_USA_M78578_en
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For safety and security
WARNING
●Do not use a seat accessory, such as a
cushion and seat cover, that covers the
seat cushion surface.
●Do not modify or replace the uphol-
stery of the front seat.
Exhaust gas precautions
Harmful substance to the human
body is contained in exhaust gases
if inhaled.
WARNING
Exhaust gases contain harmful carbon
monoxide (CO), which is colorless and
odorless. Observe the following precau-
tions.
Failure to do so may cause exhaust gases
to enter the vehicle and may lead to an
accident caused by light-headedness, or
may lead to death or a serious health
hazard.
■Important points while driving
●Keep the back door closed.
●If you smell exhaust gases in the vehi-
cle even when the back door is closed,
open the windows and have the vehi-
cle inspected at your Lexus dealer as
soon as possible.
■When parking
●If the vehicle is in a poorly ventilated
area or a closed area, such as a
garage, stop the hybrid system.
●Do not leave the vehicle with the
hybrid system on for a long time. If
such a situation cannot be avoided,
park the vehicle in an open space and
ensure that exhaust fumes do not enter
the vehicle interior.
●Do not leave the hybrid system operat-
ing in an area with snow build-up, or
where it is snowing. If snowbanks build
up around the vehicle while the hybrid
system is operating, exhaust gases
may collect and enter the vehicle.

471-2. Child safety
LEXUS NX300h Owners Manual_USA_M78578_en
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For safety and security
1-2.Child safety
Points to remember: P.47
Child restraint system: P.48
When using a child restraint system:
 P.49
Child restraint system installation
method
• Fixed with a seat belt: P.51
• Fixed with a child restraint LATCH anchor: P.55
• Using an anchor bracket (for top tether strap): P.57
The laws of all 50 states of the U.S.A.
as well as Canada now require the use
of child restraint systems.
 Prioritize and observe the warn-
ings, as well as the laws and regula-
Riding with children
Observe the following precautions
when children are in the vehicle.
Use a child restraint system appro-
priate for the child , until the child
becomes large enough to properly
wear the vehicle’s seat belt.
 It is recommended that children
sit in the rear seats to avoid acci-
dental contact with the shift lever,
wiper switch, etc.
 Use the rear door child-protector
lock or the window lock switch to
avoid children opening the door
while driving or operating the
power window accidentally.
( P.113, 149)
 Do not let small children operate
equipment which may catch or
pinch body parts, such as the
power window, hood, back door,
seats etc.
WARNING
■When children are in the vehicle
Never leave children unattended in the
vehicle, and never allow children to have
or use the key.
Children may be able to start the vehicle
or shift the vehicle into neutral. There is
also a danger that children may injure
themselves by playing with the windows,
the moon roof (if eq uipped) or other fea-
tures of the vehicle. In addition, heat
build-up or extremely cold temperatures
inside the vehicle can be fatal to children.
Child restraint systems
Before installing a child restraint
system in the vehicle, there are pre-
cautions that need to be observed,
different types of child restraint sys-
tems, as well as installation meth-
ods, etc., written in this manual.
Use a child restraint system when
riding with a small child that cannot
properly use a seat belt. For the
child’s safety, install the child restraint
system to a rear seat. Be sure to fol-
low the installation method that is in
the operation manual enclosed with
the restraint system.
Table of contents
Points to remember

481-2. Child safety
LEXUS NX300h Owners Manual_USA_M78578_en
tions for child restraint systems.
 Choose a child restraint system that
suits your vehicle and is appropriate
to the age and size of the child.
 Use a child restraint system until the
child becomes large enough to
properly wear the vehicle’s seat belt.
■Types of child restraint system installation methods
Confirm with the operation manual enclosed with the child restraint system about
the installation of the child restraint system.
WARNING
■When a child is riding
Observe the following precautions. Fail-
ure to do so may result in death or seri-
ous injury.
●For effective protection in automobile
accidents and sudden stops, a child
must be properly restrained, using a
seat belt or child restraint system
which is correctly installed. For installa-
tion details, refer to the operation man-
ual enclosed with the child restraint
system. General insta llation instruction
is provided in this manual.
●Lexus strongly urges the use of a
proper child restraint system that con-
forms to the weight and size of the
child, installed on the rear seat.
According to accident statistics, the
child is safer when properly restrained
in the rear seat than in the front seat.
●Holding a child in your or someone
else’s arms is not a substitute for a child
restraint system. In an accident, the
child can be crushe d against the wind-
shield or between the holder and the
interior of the vehicle.
■Handling the child restraint system
If the child re straint system is not prop-
erly fixed in place, the child or other pas-
sengers may be seriously injured or even
killed in the event of sudden braking, sud-
den swerving, or an accident.
●If the vehicle were to receive a strong
impact from an accident, etc., it is pos-
sible that the child restraint system has
damage that is not readily visible. In
such cases, do not reuse the restraint
system.
●Make sure you have complied with all
installation instructions provided with
the child restraint system manufac-
turer and that the system is properly
secured.
●Keep the child rest raint system prop-
erly secured on the seat even if it is not
in use. Do not store the child restraint
system unsecured in the passenger
compartment.
●If it is necessary to detach the child
restraint system, remove it from the
vehicle or store it securely in the lug-
gage compartment.
Child restraint system

491-2. Child safety
LEXUS NX300h Owners Manual_USA_M78578_en
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For safety and security
■When installing a child restraint
system to a front passenger seat
For the safety of a child, install child
restraint systems to a rear seats. When
installing child restraint system to a
front passenger seat is unavoidable,
adjust the seat as follows and install the
child restraint system. 
Move the front seat fully rearward. If
the passenger seat height can be
adjusted, move it to the upper most
position.
 Adjust the seatback angle to the
most upright position. When install-
ing a forward-facing child seat, if
there is a gap between the child seat
and the seatback, adjust the seat-
back angle until good contact is
achieved.
Installation methodPage
Seat belt attachmentP.51
Child restraint
LATCH anchors attachment
P.55
Anchor brackets (for top tether strap) attachment
P.57
When using a child restraint sys-
tem

511-2. Child safety
LEXUS NX300h Owners Manual_USA_M78578_en
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For safety and security
A child restraint system for a small
child or baby must itself be properly
restrained on the seat with the lap por-
tion of the lap/shoulder belt.
■Installing child restraint system
using a seat belt (child restraint
lock function belt)
Install the child restraint system in
accordance to the operation manual
enclosed with the child restraint sys-
tem.
■Rear-facing — Infant seat/convert-
ible seat
1 Adjust the rear seat
If there is a gap between the child seat and
the seatback, adjust the seatback until
good contact is achieved.
2Place the child restraint system on
the rear seat facing the rear of the
vehicle.
3 Run the seat belt through the child
restraint system and insert the plate
into the buckle. Make sure that the
belt is not twisted.
4 Fully extend the shoulder belt and
allow it to retract to put it in lock
mode. In lock mode, the belt cannot
be extended.
5 While pushing the child restraint
system down into the rear seat,
allow the shoulder belt to retract WARNING
●Use child restraint system suitable to
the age and size of the child and install
it to the rear seat.
●If the driver’s seat interferes with the
child restraint system and prevents it
from being attached correctly, attach
the child restraint system to the right-
hand rear seat.
●Adjust the front passenger seat so that
it does not interfere with the child
restraint system.
Child restraint system fixed with
a seat belt

521-2. Child safety
LEXUS NX300h Owners Manual_USA_M78578_en
until the child restraint system is
securely in place.
After the shoulder belt has retracted to a
point where there is no slack in the belt,
pull the belt to check that it cannot be
extended.
6After installing the child restraint
system, rock it back and forth to
ensure that it is installed securely.
(P.54)
■Forward-facing — Convertible seat
1 Adjust the seat
When using the front passenger
seat
If installing the child re straint system to the
front passenger seat is unavoidable, refer
to P.49 for front passe nger seat adjust-
ment.
When using the rear seat
If there is a gap between the child seat and
the seatback, adjust the seatback angle
until good contact is achieved.
2 If the head restraint interferes with
the child restraint system installa-
tion and the head restraint can be removed, remove the head
restraint. (
P.142)
3 Place the child restraint system on
the seat facing the front of the vehi-
cle.
4 Run the seat belt through the child
restraint system and insert the plate
into the buckle. Make sure that the
belt is not twisted.
5 Fully extend the shoulder belt and
allow it to retract to put it in lock

531-2. Child safety
LEXUS NX300h Owners Manual_USA_M78578_en
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For safety and security
mode. In lock mode, the belt cannot
be extended.
6 While pushing the child restraint
system into the rear seat, allow the
shoulder belt to retract until the
child restraint system is securely in
place.
After the shoulder belt has retracted to a
point where there is no slack in the belt,
pull the belt to check that it cannot be
extended.
7If the child restraint has a top tether
strap, follow the child restraint man-
ufacturer’s operation manual
regarding the installation, using the
top tether strap to latch onto the
top tether strap anchor. ( P.57)
8 After installing the child restraint
system, rock it back and forth to
ensure that it is installed securely.
(P.54)
■Booster seat
1 If installing the child restraint sys-
tem to the front passenger seat is
unavoidable, refer to P.49 for front
passenger seat adjustment.
2 High back type: If the head restraint
interferes with your child restraint
system, and the head restraint can
be removed, remove the head
restraint. ( P.142)
3 Place the child restraint system on
the seat facing the front of the vehi-
cle.
Booster type

541-2. Child safety
LEXUS NX300h Owners Manual_USA_M78578_en
High back type
4 Sit the child in the child restraint
system. Fit the seat belt to the child
restraint system according to the
manufacturer’s in structions and
insert the plate into the buckle.
Make sure that the belt is not
twisted.
Check that the shoulder belt is correctly
positioned over the child’s shoulder and
that the lap belt is as low as possible.
(  P.27)
■Removing a child restraint system
installed with a seat belt
Press the buckle release button and
fully retract the seat belt.
When releasing the buckle, the child
restraint system may spring up due to the
rebound of the seat cushion. Release the
buckle while holding down the child
restraint system.
Since the seat belt automatically reels itself,
slowly return it to the stowing position.
WARNING
■When installing a child restraint sys-
tem
Observe the following precautions. Fail-
ure to do so may result in death or seri-
ous injury.
●Do not allow children to play with the
seat belt. If the seat belt becomes
twisted around a child’s neck, it may
lead to choking or other serious inju-
ries that could result in death. If this
occurs and the buckle cannot be
unfastened, scissors should be used to
cut the belt.
●Ensure that the belt and plate are
securely locked and the seat belt is not
twisted.
●Shake the child rest raint system left
and right, and forward and backward
to ensure that it has been securely
installed.
●After securing a child restraint system,
never adjust the seat.
●When a booster seat is installed,
always ensure that th e shoulder belt is
positioned across the center of the
child’s shoulder. The belt should be
kept away from the child’s neck, but
not so that it could fall off the child’s
shoulder.
●Follow all installation instructions pro-
vided by the child restraint system
manufacturer.