LEXUS NX 300 (2019 year). Instruction - part 3

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Points to remember: 

P.44

Child restraint system: 

P.46

When using a child restraint system on 
a passenger seat: 

P.47

When using a child restraint system on 
a rear seat: 

P.48

Child restraint system installation 
method
• Fixed with a seat belt: 

P.48

• Fixed with a child restraint LATCH 

anchor: 

P.52

• Using an anchor bracket (for top 

tether strap): 

P.54

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-
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 appro-

priate for the child until the child 
becomes large enough to properly 
wear the vehicle’s seat belt.

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 follow the installation 
method that is in the operation 
manual enclosed with the restraint 
system.

Table of contents

Points to remember

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 

depending on the age and size of the 

child.

●

Lexus strongly urges the use of a 

proper child restraint system that con-

forms to the size of the child, installed 

on the rear seat. According to acci-

dent 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 crushed against the wind-

shield or between the holder and the 

interior of the vehicle.

●

Place one child to a child restraint sys-

tem and then secure the child with the 

harness of the child restraint system.

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For safety and security

WARNING

■

Handling the child restraint system

If the child restraint 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 restraint 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.

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■

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.

Child restraint system

Installation method

Page

Seat belt attachment

P.48

Child restraint 

LATCH anchors 

attachment

P.52

Anchor brackets (for 

top tether strap) 

attachment

P.54

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1

For safety and security

■

When installing a child restraint 
system to a 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 passenger seat as follows 
and install the child restraint system.
 Raise the seatback as much as pos-

sible

 Move the seat to the rearmost posi-

tion

 Raise the seat to the upper most 

position

 If the head restraint interferes with 

the child restraint system installa-
tion and the head restraint can be 
removed, remove the head restraint

When using a child restraint sys-
tem on a passenger seat

WARNING

■

When installing a child restraint sys-

tem

Observe the following when installing 

child restraint system to the front passen-

ger seat if it is unavoidable. The front pas-

senger SRS air bag inflates with 

considerable speed and force that if not 

observed may lead to death or serious 

injury to the child.

●

Never install a rear-facing child 

restraint system on the front passenger 

seat even if the “AIR BAG OFF” indi-

cator light is illuminated. In the event of 

an accident, the force of the rapid infla-

tion 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 passen-

ger seat.

●

A forward-facing child restraint system 

may be installed on the front passen-

ger seat only when it is unavoidable. A 

child restraint system that requires a 

top tether strap should not be used in 

the front passenger seat since there is 

no top tether strap anchor for the front 

passenger seat.

●

A forward-facing child restraint system 

may be installed on the front passen-

ger seat only when it is unavoidable. 

When installing a forward-facing child 

restraint system on the front passenger 

seat, move the seat as far back as pos-

sible, and raise the seat to the upper 

most position, even if the “AIR BAG 

OFF” indicator light is illuminated. If 

the head restraint interferes with the 

child restraint system installation and 

the head restraint can be removed, 

remove the head restraint.

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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 seatback

If there is a gap between the child seat and 

the seatback, adjust the seatback until 

good contact is achieved.

WARNING

●

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 pillars or roof side rails from 

which the SRS side airbags or SRS 

curtain shield airbags deploy even if 

the child is seated in the child restraint 

system. It is dangerous if the SRS side 

and curtain shield airbags inflate, and 

the impact could cause death or seri-

ous injury to the child.

●

When a booster seat is installed, 

always ensure that the 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.

When using a child restraint sys-
tem on a rear seat

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.

●

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.

●

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, 

rear pillars or roof side rails from which 

the SRS curtain shield airbag deploys 

even if the child is seated in the child 

restraint system. It is dangerous if the 

SRS curtain shield airbag inflates, and 

the impact could cause death or seri-

ous injury to the child.

Child restraint system fixed with 
a seat belt

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For safety and security

2

Place 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 

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.

6

After installing the child restraint 
system, rock it back and forth to 
ensure that it is installed securely.

■

Forward-facing — Convertible seat

1

Adjust the seatback

If there is gap between the child seat and 

the seatback, adjust the seatback 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.122)

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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 
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.

7

If 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.54)

8

After installing the child restraint 
system, rock it back and forth to 
ensure that it is installed securely.

■

Booster seat

1

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.122)

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1

For safety and security

2

Place the child restraint system on 
the seat facing the front of the vehi-
cle.



Booster type



High back type

3

Sit the child in the child restraint 
system. Fit the seat belt to the child 
restraint system according to the 
manufacturer’s instructions 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.25)

■

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.

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■

Child restraint LATCH anchors

LATCH anchors are provided for the 
outboard rear seats. (Buttons display-
ing the location of the anchors are 
attached to the seats.)

■

Installation with LATCH system

Install the child restraint system in 
accordance to the operation manual 

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 restraint 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 the 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.

●

When securing some types of child 

restraint systems in rear seats, it may 

not be possible to properly use the 

seat belts in positions next to the child 

restraint without interfering with it or 

affecting seat belt effectiveness. Be 

sure your seat belt fits snugly across 

your shoulder and low on your hips. If it 

does not, or if it interferes with the 

child restraint, move to a different posi-

tion. Failure to do so may result in 

death or serious injury.

●

When installing a child restraint system 

in the rear center seat, adjust both 

seatbacks at the same angle. Other-

wise, the child restraint system cannot 

be securely restrained and this may 

cause death or serious injuries in the 

event of sudden braking, sudden 

swerving or an accident.

■

When installing a booster seat

To prevent the belt from going into ALR 

lock mode, do not fully extend the shoul-

der belt. ALR mode causes the belt to 

tighten only. This could cause injury or 

discomfort to the child. (

P.26)

■

Do not use a seat belt extender

If a seat belt extender is used when 

installing a child restraint system, the seat 

belt will not securely hold the child 

restraint system, which could cause 

death or serious injury to the child or 

other passengers in the event of sudden 

braking, sudden swerving or an accident.

Child restraint system fixed with 
a child restraint LATCH anchor

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1

For safety and security

enclosed with the child restraint sys-
tem.

1

Adjust the seatback

If there is a gap between the child seat and 

the seatback, adjust the seatback 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.122)



Type A

3

Latch the hooks of the lower straps 
onto the LATCH anchors.

For owners in Canada:

The symbol on a child restraint system indi-
cates 

 the presence of a lower connec-

tor system.



Type B

3

Latch the buckles onto the LATCH 
anchors.

For owners in Canada:

The symbol on a child restraint system indi-
cates 

 the presence of a lower connec-

A

A

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tor system.

4

If 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.54)

5

After installing the child restraint 
system, rock it back and forth to 
ensure that it is installed securely.

■

Laws and regulations pertaining to 

anchors

The LATCH system conforms to 

FMVSS225 or CMVSS210.2.

Child restraint systems conforming to 

FMVSS213 or CMVSS213 specifications 

can be used.

This vehicle is designed to conform to SAE 

J1819.

■

Anchor brackets (for top tether 
strap)

Anchor brackets are provided for each 
rear seat.
Use anchor brackets when fixing the 
top tether strap.

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.

●

Shake the child restraint 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 using the LATCH anchors, be 

sure that there are no foreign objects 

around the anchors and that the seat 

belt is not caught behind the child 

restraint system.

●

Follow all installation instructions pro-

vided by the child restraint system 

manufacturer.

●

When securing some types of child 

restraint systems in rear seats, it may 

not be possible to properly use the 

seat belts in positions next to the child 

restraint without interfering with it or 

affecting seat belt effectiveness. Be 

sure your seat belt fits snugly across 

your shoulder and low on your hips. If it 

does not, or if it interferes with the 

child restraint, move to a different posi-

tion. Failure to do so may result in 

death or serious injury.

Using an anchor bracket (for top 
tether strap)

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For safety and security

Anchor bracket
Anchor bracket for rear center seat
Anchor bracket for rear outboard 
seats

■

Fixing the top tether strap to the 
anchor bracket

Install the child restraint system in 
accordance to the operation manual 
enclosed with the child restraint sys-
tem.



Outboard rear seats

1

Adjust the head restraint to the 
upmost position.

If the head restraint interferes with the child 

restraint system installation and the head 

restraint can be removed, remove the head 

restraint. (

P.122)

2

Open the anchor bracket cover, 
latch the hook onto the anchor 
bracket and tighten the top tether 
strap.

Make sure the top tether strap is securely 

latched.

When installing the child restraint system 

with the head restraint being raised, be 

sure to have the top tether strap pass 

underneath the head restraint.

Top tether strap
Hook



Rear center seat

1

Adjust the head restraint to the 
downmost position.

If the head restraint interferes with the child 

restraint system installation and the head 

restraint can be removed, remove the head 

restraint. (

P.122)

2

Open the anchor bracket cover, 
latch the hook onto the anchor 
bracket and tighten the top tether 
strap.

Make sure the top tether strap is securely 

latched.

When installing the child restraint system 

with the head restraint being lower, be sure 

to have the top tether strap pass over the 

A
B
C

A
B

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top of the head restraint.

Top tether strap
Hook

■

Laws and regulations pertaining to 

anchors

The LATCH system conforms to 

FMVSS225 or CMVSS210.2.

Child restraint systems conforming to 

FMVSS213 or CMVSS213 specifications 

can be used.

This vehicle is designed to conform to SAE 

J1819.

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.

●

Firmly attach the top tether strap and 

make sure that the belt is not twisted.

●

Do not attach the top tether strap to 

anything other than the anchor 

bracket.

●

Shake the child restraint 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.

●

Follow all installation instructions pro-

vided by the child restraint system 

manufacturer.

A
B

●

Outboard rear seats: When installing 

the child restraint system with the head 

restraint being raised, after the head 

restraint has been raised and then the 

anchor bracket has been fixed, do not 

lower the head restraint.

●

Rear center seat: When installing the 

child restraint system with the head 

restraint being lowered, be sure to 

have the top tether strap pass over the 

top of the head restraint. If the belt 

passes below the head restraint, it is 

possible that the child restraint system 

may not be securely fixed.

NOTICE

■

Anchor brackets (for top tether 

strap)

When not in use, make certain to close 

the lid. If it remains open, the lid may be 

damaged.

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For safety and security

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-deadness, 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 engine.

●

Do not leave the vehicle with the 

engine running 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 engine running in an 

area with snow build-up, or where it is 

snowing. If snowbanks build up around 

the vehicle while the engine is running, 

exhaust gases may collect and enter 

the vehicle.

■

Exhaust pipe

The exhaust system needs to be checked 

periodically. If there is a hole or crack 

caused by corrosion, damage to a joint 

or abnormal exhaust noise, be sure to 

have the vehicle inspected and repaired 

by your Lexus dealer.

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1-2.Theft deterrent system

The indicator light flashes after the 
engine switch has been turned off to 
indicate that the system is operating.
The indicator light stops flashing after 
the engine switch has been turned to 

ACCESSORY or IGNITION ON 
mode to indicate that the system has 
been canceled.

■

System maintenance

The vehicle has a maintenance-free type 

engine immobilizer system.

■

Conditions that may cause the system to 

malfunction

●

If the grip portion of the key is in contact 

with a metallic object

●

If the key is in close proximity to or touch-

ing a key registered to the security sys-

tem (key with a built-in transponder chip) 

of another vehicle

■

Certification for the engine immobilizer system



For vehicles sold in the U.S.A.

Engine immobilizer system

The vehicle’s keys have built-in tran-
sponder chips that prevent the 
engine from starting if a key has not 
been previously registered in the 
vehicle’s on-board computer.
Never leave the keys inside the 
vehicle when you leave the vehicle.
This system is designed to help pre-
vent vehicle theft but does not guar-
antee absolute security against all 
vehicle thefts.

Operating the system

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For safety and security



For vehicles sold in Canada

WARNING

■

Certifications for the engine immobi-

lizer system

Changes or modifications not expressly 

approved by the party responsible for 

compliance could void the user’s author-

ity to operate the equipment.

NOTICE

■

To ensure the system operates cor-

rectly

Do not modify or remove the system. If 

modified or removed, the proper opera-

tion of the system cannot be guaranteed.