ESP LEXUS NX300h 2021 Repair Manual

3977-2. Steps to take in an emergency
LEXUS NX300h Owners Manual_USA_M78578_en
7
When trouble arises
●Avoid abrupt maneuvering and brak-
ing. If the vehicle tires deteriorate, you
could lose control of the steering
wheel or the brakes.
■If a blowout or sudden air leakage
should occur
The tire pressure warning system may
not activate immediately.
■Maintenance of the tires
Each tire, including the spare (if pro-
vided), should be checked monthly when
cold and inflated to the inflation pressure
recommended by the vehicle manufac-
turer on the vehicle placard or tire infla-
tion pressure label (tire and load
information label). (I f your vehicle has
tires of a different size than the size indi-
cated on the vehicle placard or tire infla-
tion pressure label [tire and load
information label], yo u should determine
the proper tire infl ation pressure for
those tires.)
As an added safety feature, your vehicle
has been equipped with a tire pressure
monitoring system (TPMS-tire pressure
warning system) that illuminates a low
tire pressure telltale (tire pressure warn-
ing light) when one or more of your tires
is significantly under-inflated. Accord-
ingly, when the low tire pressure telltale
(tire pressure warnin g light) illuminates,
you should stop and check your tires as
soon as possible, and inflate them to the
proper pressure. Driving on a signifi-
cantly under-inflated tire causes the tire
to overheat and can lead to tire failure.
Under-inflation also reduces fuel effi-
ciency and tire tread life, and may affect
the vehicle’s handling and stopping abil-
ity.
Please note that the TPMS (tire pressure
warning system) is not a substitute for
proper tire maintenance, and it is the
driver’s responsibility to maintain correct
tire pressure, even if under-inflation has
not reached the level to trigger illumina-
tion of the TPMS low tire pressure telltale
(tire pressure warning light).
Your vehicle has also been equipped with
a TPMS (tire pressure warning system)
malfunction indicator to indicate when
the system is not operating properly. The
TPMS (tire pressure warning system)
malfunction indicator is combined with
the low tire pressure telltale (tire pres-
sure warning light) . When the system
detects a malfunction, the telltale will
flash for approximately one minute and
then remain continuously illuminated.
This sequence will continue upon subse-
quent vehicle start-ups as long as the
malfunction exists. When the malfunction
indicator is illuminated, the system may
not be able to detect or signal low tire
pressure as intended.
TPMS (tire pressure warning system)
malfunctions may occur for a variety of
reasons, including the installation of
replacement or alternate tires or wheels
on the vehicle that prevent the TPMS
(tire pressure warning system) from func-
tioning properly. Always check the
TPMS (tire pressure warning system)
malfunction telltale after replacing one
or more tires or wheels on your vehicle to
ensure that the replacement or alternate
tires and wheels allow the TPMS (tire
pressure warning system) to continue to
function properly.
NOTICE
■To ensure the tire pressure warning
system operates properly
Do not install tires with different specifi-
cations or makers, as the tire pressure
warning system may not operate prop-
erly.

4167-2. Steps to take in an emergency
LEXUS NX300h Owners Manual_USA_M78578_en
Positive (+) battery terminal (second vehicle)
Negative (-) battery terminal (second vehicle)
Solid, stationary, unpainted metallic point away from the exclusive jump starting
terminal and any mo ving parts as shown in the illustration
6 Start the engine of the second vehi-
cle. Increase the engine speed
slightly and maintain at that level for
approximately 5 minutes to
recharge the 12-volt battery of your
vehicle.
7 Open and close any of the doors of
your vehicle with the power switch
off.
8 Maintain the engine speed of the
second vehicle and start the hybrid
system of your vehicle by turning
the power switch to ON mode.
9 Make sure the “READY” indicator
comes on. If the indicator light does
not come on, contact your Lexus
dealer.
10 Once the hybrid system has
started, remove the jumper cables
in the exact reverse order from
which they were connected.
11 Close the exclusive jump starting
terminal cover, and reinstall the fuse
box cover to its original position.
Once the hybrid system starts, have
the vehicle inspected at your Lexus
dealer as soon as possible.
■Starting the hybrid system when the 12-
volt battery is discharged
The hybrid system cannot be started by
push-starting.
■To prevent 12-volt battery discharge
●Turn off the headlights and the audio sys-
tem while the hybrid system is off.
●Turn off any unnecessary electrical com-
ponents when the vehicle is running at a
low speed for an extended period, such
as in heavy traffic.
■Charging the 12-volt battery
The electricity stored in the 12-volt battery
will discharge gradually even when the
vehicle is not in use, due to natural dis-
charge and the draining effects of certain
electrical appliances. If the vehicle is left for
a long time, the 12-volt battery may dis-
charge, and the hybrid system may be
unable to start. (The 12-volt battery
recharges automatically while the hybrid
system is operating.)
■When the 12-volt batte ry is removed or
discharged
●In some cases, it may not be possible to
unlock the doors using the smart access
system with push-button start when the
12-volt battery is discharged. Use the
wireless remote control or the mechani-
cal key to lock or unlock the doors.
●The hybrid system may not start on the
first attempt after the 12-volt battery has
recharged but will start normally after the
second attempt. This is not a malfunction.
●The power switch mode is memorized by
the vehicle. When the 12-volt battery is
reconnected, the system will return to the
mode it was in before the 12-volt battery
was discharged. Before disconnecting
the 12-volt battery, turn the power switch
off.
If you are unsure what mode the power
switch was in before the 12-volt battery
discharged, be especially careful when
reconnecting the 12-volt battery.
●Some systems may requ ire initialization.
B
C
D

4217-2. Steps to take in an emergency
LEXUS NX300h Owners Manual_USA_M78578_en
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When trouble arises
1Stop the hybrid system. Shift the
shift lever to P and set the parking
brake.
2 Remove the mud, snow or sand
from around the front wheels.
3 Place wood, stones or some other
material under the front wheels to
help provide traction.
4 Restart the hybrid system.
5 Shift the shift lever to D or R,
release the parking brake. Then,
while exercising caution, depress
the accelerator pedal.
■When it is difficult to free the vehicle
Press to turn off TRAC. ( P.273)
WARNING
●After the hybrid system has been
turned off, check that the “READY”
indicator is off. When the hybrid sys-
tem is operating, the gasoline engine
may automatically start, or the cooling
fan may suddenly operate even if the
gasoline engine stops. Do not touch or
approach rotating parts such as the
fan, which may lead to fingers or cloth-
ing (especially a tie, a scarf or a muf-
fler) getting caught, resulting in serious
injury.
●Do not loosen the coolant reservoir
cap while the hybrid system and radia-
tor are hot.
High temperature steam or coolant
could spray out.
NOTICE
■When adding engine/power control
unit coolant
Add coolant slowly after the hybrid sys-
tem has cooled down sufficiently. Adding
cool coolant to a hot hybrid system too
quickly can cause damage to the hybrid
system.
■To prevent damage to the cooling sys-
tem
Observe the following precautions:
●Avoid contaminating the coolant with
foreign matter (such as sand or dust
etc.).
●Do not use any coolant additive.
If the vehicle becomes stuck
Carry out the following proce-
dures if the tires spin or the vehicle
becomes stuck in mud, dirt or snow:
Recovering procedure

4378-1. Specifications
LEXUS NX300h Owners Manual_USA_M78578_en
8
Vehicle specifications
Chafer
This information has been prepared in
accordance with regulations issued by
the National Highway Traffic Safety
Administration of the U.S. Department
of Transportation.
It provides the purchasers and/or pro-
spective purchasers of Lexus vehicles
with information on uniform tire quality
grading.
Your Lexus dealer will help answer any
questions you may have as you read this
information.
■DOT quality grades
All passenger vehicle tires must con-
form to Federal Safety Requirements in
addition to these grades. Quality
grades can be found where applicable
on the tire sidewall between tread
shoulder and maximum section width.
For example: Treadwear 200 Traction AA
Temperature A
■Treadwear
The treadwear grade is a comparative
rating based on the wear rate of the tire
when tested under controlled condi-
tions on a specified government test
course.
For example, a tire graded 150 would wear
one and a half (1 - 1/2) times as well on the
government course as a tire graded 100.
The relative performa nce of tires depends
upon the actual conditions of their use,
however, and may depart significantly from
the norm due to variatio ns in driving habits,
service practices and differences in road characteristics and climate.
■Traction AA, A, B, C
The traction grades, from highest to
lowest, are AA, A, B and C, and they
represent the tire’s ability to stop on
wet pavement as measured under con-
trolled conditions on specified govern-
ment test surfaces of asphalt and
concrete.
A tire marked C may have poor traction
performance.
Warning: The traction grade assigned to
this tire is based on braking (straight
ahead) traction tests and does not include
cornering (turning) traction.
■Temperature A, B, C
The temperature grades are A (the
highest), B, and C, representing the
tire’s resistance to the generation of
heat and its ability to dissipate heat
when tested under controlled condi-
tions on a specified indoor laboratory
test wheel.
Sustained high temperature can cause the
material of the tire to degenerate and
reduce tire life, and excessive temperature
can lead to sudd en tire failure.
Grade C corresponds to a level of perfor-
mance which all passenger car tires must
meet under the Fede ral Motor Vehicle
Safety Standard No. 109.
Grades B and A represent higher levels of
performance on the laboratory test wheel
than the minimum required by law.
Warning: The temperature grades for this
tire are established for a tire that is prop-
erly inflated and not overloaded.
Excessive speed, unde rinflation, or exces-
sive loading, either separately or in combi-
Uniform Tire Quality Grading
K

4398-1. Specifications
LEXUS NX300h Owners Manual_USA_M78578_en
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Vehicle specifications
Rim type
designationThe industry manufac-
turer’s designation for a rim
by style or code
Rim widthNominal distance between
rim flanges
Vehicle
capacity
weight
(Total load
capacity)The rated cargo and lug-
gage load plus 150 lb. (68
kg) times the vehicle’s des-
ignated seating capacity
Vehicle max-
imum load
on the tire
The load on an individual
tire that is determined by
distributing to each axle its
share of the maximum
loaded vehicle weight, and
dividing by two
Vehicle nor-
mal load on
the tire
The load on an individual
tire that is determined by
distributing to each axle its
share of curb weight, acces-
sory weight, and normal
occupant weight (distrib-
uted in accordance with
Table 1
* below), and dividing
by two
Weather
sideThe surface area of the rim
not covered by the inflated
tire
Bead
The part of the tire that is
made of steel wires,
wrapped or reinforced by
ply cords and that is shaped
to fit the rim
Bead sepa-
rationA breakdown of the bond
between components in the
bead
Tire related termMeaning
Bias ply tire
A pneumatic tire in which
the ply cords that extend to
the beads are laid at alter-
nate angles substantially
less than 90 degrees to the
centerline of the tread
Carcass
The tire structure, except
tread and sidewall rubber
which, when inflated, bears
the load
Chunking
The breaking away of
pieces of the tread or side-
wall
CordThe strands forming the
plies in the tire
Cord sepa-
rationThe parting of cords from
adjacent rubber com-
pounds
Cracking
Any parting within the
tread, sidewall, or innerliner
of the tire extending to cord
material
CT
A pneumatic tire with an
inverted flange tire and rim
system in which the rim is
designed with rim flanges
pointed radially inward and
the tire is designed to fit on
the underside of the rim in a
manner that encloses the
rim flanges inside the air
cavity of the tire
Extra load
tire
A tire designed to operate
at higher loads and at
higher inflation pressures
than the corresponding
standard tire
Tire related termMeaning

4418-1. Specifications
LEXUS NX300h Owners Manual_USA_M78578_en
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Vehicle specifications
*:Table 1  Occupant loading and distri-
bution for vehicle normal load for vari-
ous designated seating capacities
Pneumatic
tire
A mechanical device made
of rubber, chemicals, fabric
and steel or other materials,
that, when mounted on an
automotive wheel, provides
the traction and contains
the gas or fluid that sustains
the load
Radial ply
tire
A pneumatic tire in which
the ply cords that extend to
the beads are laid at sub-
stantially 90 degrees to the
centerline of the tread
Reinforced
tire
A tire designed to operate
at higher loads and at
higher inflation pressures
than the corresponding
standard tire
Section
width
The linear distance between
the exteriors of the sidewalls
of an inflated tire, excluding
elevations due to labeling,
decoration, or protective
bands
SidewallThat portion of a tire
between the tread and bead
Sidewall sep-
arationThe parting of the rubber
compound from the cord
material in the sidewall
Tire related termMeaning
Snow tire
A tire that attains a traction
index equal to or greater
than 110, compared to the
ASTM E-1136 Standard
Reference Test Tire, when
using the snow traction test
as described in ASTM F-
1805-00, Standard Test
Method for Single Wheel
Driving Traction in a
Straight Line on Snow-and
Ice-Covered Surfaces, and
which is marked with an
Alpine Symbol ( ) on at
least one sidewall
Test rim
The rim on which a tire is fit-
ted for testing, and may be
any rim listed as appropri-
ate for use with that tire
Tread
That portion of a tire that
comes into contact with the
road
Tread ribA tread section running cir-
cumferentially around a tire
Tread sepa-
rationPulling away of the tread
from the tire carcass
Treadwear
indicators
(TWI)
The projections within the
principal grooves designed
to give a visual indication of
the degrees of wear of the
tread
Wheel-hold-
ing fixtureThe fixture used to hold the
wheel and tire assembly
securely during testing
Tire related termMeaning

4579-1. For owners
LEXUS NX300h Owners Manual_USA_M78578_en
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For owners
■Soins à porter aux ceintures de
sécurité
Nettoyez avec un chiffon ou une
éponge humectée d’eau savonneuse
tiède. Par ailleurs, vérifiez régulière-
ment que les ceintures ne sont pas
effilochées, entaillées, ou ne paraissent
pas exagérément usées.
Entretien et soin
AVERTISSEMENT
Respectez les précautions suivantes afin
de réduire le risque de blessure en cas
de freinage brusque, d’embardée ou
d’accident.
À défaut, des blessures graves, voire
mortelles, pourraient s’ensuivre.
■Port de la ceinture de sécurité
●Ne pas passer la sangle diagonale
sous le bras.
●Faites toujours passer votre ceinture
de sécurité au plus bas sur vos
hanches et bien dans l’axe.
■État et usure des ceintures de sécu-
rité
Inspectez les ceinture s de sécurité péri-
odiquement. Contrôle z qu’elles ne sont
pas entaillées, effilochées, et que leurs
ancrages ne sont pas desserrés. Ne pas
utiliser une ceinture de sécurité
défectueuse avant qu’elle ne soit rem-
placée. Une ceinture de sécurité
défectueuse n’apporte aucune garantie
de protection de l’occupant contre des
blessures graves, voire mortelles.
■Lorsque vous utilisez la ceinture de
sécurité du siège central arrière
Ne pas utiliser la ceinture de sécurité du
siège central arrière avec une de ses
deux boucles déverrouillée. Si une seule
des boucles est verrouillée, tout freinage
brusque ou collision peut entraîner des
blessures graves, voire mortelles.

4609-1. For owners
LEXUS NX300h Owners Manual_USA_M78578_en
Contacteur de boucle de cein ture de sécurité conducteur
Contacteur de boucle de ceintu re de sécurité passager avant
Capteurs d’impact avant
Boîtier électronique de coussins gonflables
Votre véhicule est équipé de COUSSINS GONFLABLES INTELLIGENTS
(ADVANCED AIRBAGS) conçus selon les normes de sécurité américaines applicables
aux véhicules à moteur (FMVSS208). Le boît ier électronique de coussins gonflables
(ECU) utilise les informations reçues des capteu rs, etc. détaillés dans le schéma ci-dessus
de composition du système pour commander le déploiement des coussins gonflables. Ces
informations comprennent des in formations sur la gravité de la collision et les occupants.
Le déploiement rapide des coussins gonflables est obtenu au moyen d’une réaction
chimique dans les dispositifs pyrotechniques, qui produit un gaz inoffensif permettant
d’amortir le mouvement des occupants.
O
P
Q
R
AVERTISSEMENT
■Précautions avec les coussins gonfla-
bles SRS
Respectez les précautions suivantes
concernant les coussins gonflables SRS.
À défaut, des blessures graves, voire
mortelles, pourraient s’ensuivre.
●Le conducteur et tous les passagers à
bord du véhicule doivent porter leur
ceinture de sécurité correctement.
Les coussins gonflables SRS sont des
dispositifs de protection complémen-
taires aux ceintures de sécurité.

4639-1. For owners
LEXUS NX300h Owners Manual_USA_M78578_en
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For owners
AVERTISSEMENT
●Ne rien fixer ou disposer sur la
planche de bord, la garniture centrale
du moyeu de volant de direction et la
partie inférieure du tableau de bord.
Lors du déploiement des coussins
gonflables SRS conducteur, passager
avant et de genoux, tout objet risque
de se transformer en projectile.
●Ne rien fixer aux parties telles qu’une
porte, le pare-brise, une vitre latérale,
un montant avant ou arrière, un rail
latéral de toit et une poignée de main-
tien.
●Ne pas suspendre aux crochets à
vêtements un cintre nu ni aucun objet
dur ou tranchant. En cas de déploie-
ment des coussins gonflables SRS
rideau, tous ces objets pourraient se
transformer en projectiles et causer
des blessures graves, voire mortelles.
●Si une housse en vinyle recouvre la
partie où le coussins gonflable SRS de
genoux se déploie, veillez à l’enlever.
●N’utilisez pour les sièges aucun acces-
soire venant recouvrir les parties où se
déploient les coussins gonflables SRS
latéraux et le coussin gonflable SRS
d’assise de siège, car il risquerait de
gêner le déploiement des coussins
gonflables SRS. De tels accessoires
peuvent empêcher les coussins gon-
flables latéraux et d’ assise de siège de
s’activer correctement, neutraliser le
système ou provoquer le déploiement
accidentel des coussins gonflables
latéraux et d’assise de siège, provo-
quant ainsi des blessures graves, voire
mortelles.
●Évitez de faire subir des chocs ou des
pressions excessives aux parties ren-
fermant les composants des coussins
gonflables SRS.
En effet, cela pourrait entraîner un
mauvais fonctionnement des coussins
gonflables SRS.
●Ne touchez aucun composant du sys-
tème immédiatement après le
déclenchement (déploiement) des
coussins gonflables SRS, car ils sont
alors encore très chauds.
●Si vous avez des di fficultés à respirer
après le déploiement des coussins
gonflables SRS, ouvrez une porte ou
une vitre pour faire entrer de l’air frais,
ou bien descendez du véhicule si cela
ne présente pas de danger. Retirez
tout résidu dès que possible afin
d’éviter d’éventuelles irritations de la
peau.
●Si les partie s renfermant les coussins
gonflables SRS, telles que la garniture
du moyeu de volant et les garnitures
de montants avant et arrière, apparais-
sent abîmées ou craquelées, faites-les
remplacer par votr e concessionnaire
Lexus.