flat tire LEXUS NX300h 2018 Service Manual

3837-2. Steps to take in an emergency
LEXUS NX300h Owners Manu-
al_USA_OM78212U 7
When trouble arises 4 Lower the vehicle.
5 Firmly tighten each wheel nut two
or three times in the order shown in
the illustration.Tightening torque:
76 ft•lbf (103 N•m, 10.5 kgf•m)
6 Stow the flat tire, tire jack and all
tools. ■
The compact spare tire●
The compact spare tire is identified by the
label “TEMPORARY USE ONLY” on
the tire sidewall.
Use the compact spare tire temporarily,
and only in an emergency.
●
Make sure to check the tire inflation pres-
sure of the compact spare tire. ( → P.406)
■
After completing the tire change
The tire pressure warning system must be
reset. ( → P.341)
■
When using the compact spare tire
As the compact spare tire is not equipped
with a tire pressure warning valve and trans-
mitter, low inflation pressure of the spare
tire will not be indicated by the tire pressure warning system. Also, if you replace the
compact spare tire afte r the tire pressure
warning light comes on, the light remains
on. ■
When the compact spare tire is
equipped
The vehicle becomes lower when driving
with the compact spare tire compared to
when driving with standard tires. ■
If you have a flat front tire on a road cov-
ered with snow or ice
Install the compact spare tire on one of the
rear wheels of the vehicle. Perform the fol-
lowing steps and fit tire chains to the front
tires:
1 Replace a rear tire with the compact
spare tire.
2 Replace the flat front tire with the tire
removed from the rear of the vehicle.
3 Fit tire chains to the front tires.
WARNING■
When using the compact spare tire ●
Remember that the sp are tire provided
is specifically designed for use with
your vehicle. Do not use your spare
tire on another vehicle. ●
Do not use more than one spare tire
simultaneously.
●
Replace the spare tire with a standard
tire as soon as possible.
●
Avoid sudden acceleration, abrupt
steering, sudden br aking and shifting
operations that cause sudden engine
braking.

406 8-1. Specifications
LEXUS NX300h Owners Manu-
al_USA_OM78212U 
Type A

Type BTires and wheels Tire size 225/65R17 102H
Tire inflation pressure
(Recommended cold tire inflation
pressure) Driving under normal conditions 
Front
35 psi (240 kPa, 2.4 kgf/cm 2
or bar)
Rear
35 psi (240 kPa, 2.4 kgf/cm 2
or bar)
Driving at high speeds (above 100 mph [160 km/
h]) (in countries where such speeds are permitted
by law)
Add 1 psi (10 kPa, 0.1 kgf/cm 2
or bar) to the front
and rear tires. Never exceed the maximum cold tire
inflation pressure indica ted on the tire sidewall.
Wheel size 17 × 7 J
Wheel nut torque 76 ft•lbf (103 N•m, 10.5 kgf•m)
Tire size 225/60R18 100H
Tire inflation pressure
(Recommended cold tire inflation
pressure) Driving under normal conditions 
Front
32 psi (220 kPa, 2.2 kgf/cm 2
or bar)
Rear
32 psi (220 kPa, 2.2 kgf/cm 2
or bar)
Driving at high speeds (above 100 mph [160 km/
h]) (in countries where such speeds are permitted
by law)
Add 9 psi (60 kPa, 0.6 kgf/cm 2
or bar) to the front
and rear tires. Never exceed the maximum cold tire
inflation pressure indica ted on the tire sidewall.
Wheel size 18 × 7 1/2 J
Wheel nut torque 76 ft•lbf (103 N•m, 10.5 kgf•m)

4078-1. Specifications
LEXUS NX300h Owners Manu-
al_USA_OM78212U 8
Vehicle specifications 
Compact spare tire
A: Wedge base bulbs (clear)
B: Wedge base bulbs (amber) *
:If equippedTire size T165/80D17 104M
Spare tire inflation pressure
(Recommended cold tire inflation
pressure) 60 psi (420 kPa, 4.2 kgf/cm 2
or bar)
Wheel size 17 × 4 T
Wheel nut torque 76 ft•lbf (103 N•m, 10.5 kgf•m)
Light bulbs Light bulbs Bulb No. W Type
Exterior Front side marker lights (bulb
type) W5W 5 A
Front turn signal lights (bulb
type)* 585
(WY21W) 21 B
Interior Vanity lights ⎯ 8 A

4118-1. Specifications
LEXUS NX300h Owners Manu-
al_USA_OM78212U 8
Vehicle specifications A radial tire has “RADIAL” on the sidewall. A tire not marked “RADIAL” is a bias-ply tire.
TUBELESS or TUBE TYPEA tubeless tire does not have a tube and air is directly put into the tire. A tube type tire has a
tube inside the tire and the tube maintains the air pressure.
Load limit at maximum cold tire inflation pressure ( → P.336)
Maximum cold tire inflation pressure ( → P.406)This means the pressure to which a tire may be inflated.
Uniform tire quality gradingFor details, see “Uniform Tire Quality Grading” that follows.
Summer tires or all season tires ( → P.336)An all season tire has “M+S” on the sidewall. A tire not marked “M+S” is a summer tire.
“TEMPORARY USE ONLY”A compact spare tire is identified by the phrase “TEMPORARY USE ONLY” molded on its
sidewall. This tire is designed for temporary emergency use only.
Type A
DOT symbol *
Tire Identification Number (TIN)
Tire manufacturer’s identification
mark
Tire size code
Manufacturer’s optional tire type
code (3 or 4 letters)
Manufacturing week
Manufacturing year *
: The DOT symbol certifies that the tire
conforms to applicable Federal Motor
Vehicle Safety Standards. 
Type B
DOT symbol *
Tire Identification Number (TIN)
Tire manufacturer’s identification
mark
Manufacturer's code
Manufacturing week
Manufacturing year *
: The DOT symbol certifies that the tire F
G
H
I
J
K
Typical DOT and Tire Identifica-
tion Number (TIN)
A
B
C
D
E
F
G A
B
C
D
E
F

4138-1. Specifications
LEXUS NX300h Owners Manu-
al_USA_OM78212U 8
Vehicle specifications 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-
nation, can cause heat buildup and
possible tire failure.

414 8-1. Specifications
LEXUS NX300h Owners Manu-
al_USA_OM78212U Glossary of tire terminology Tire related
term Meaning
Cold tire
inflation
pressure Tire pressure when the vehi-
cle has been parked for
three hours or more, or has
not been driven more than 1
mile or 1.5 km under that
condition
Maximum
inflation
pressure The maximum cold inflated
pressure to which a tire may
be inflated, shown on the
sidewall of the tire
Recom-
mended
inflation
pressure Cold tire inflation pressure
recommended by a manu-
facturer
Accessory
weight The combined weight (in
excess of those standard
items which may be
replaced) of transmission,
power steering, power
brakes, power windows,
power seats, radio and
heater, to the extent that
these items are available as
factory-installed equipment
(whether installed or not)
Curb weight The weight of a motor vehi-
cle with standard equip-
ment, including the
maximum capacity of fuel,
oil and coolant, and if so
equipped, air conditioning
and additional weight
optional engine Maximum
loaded vehi-
cle weight The sum of:
(a) Curb weight
(b) Accessory weight
(c) Vehicle capacity weight
(d) Production options
weight
Normal
occupant
weight 150 lb. (68 kg) times the
number of occupants speci-
fied in the second column of
Table 1 *
that follows
Occupant
distribution Distribution of occupants in
a vehicle as specified in the
third column of Table 1 *

below
Production
options
weight The combined weight of
installed regular production
options weighing over 5 lb.
(2.3 kg) in excess of the
standard items which they
replace, not previously con-
sidered in curb weight or
accessory weight, including
heavy duty brakes, ride lev-
elers, roof rack, heavy duty
12-volt battery, and special
trim
Rim A metal support for a tire or
a tire and tube assembly
upon which the tire beads
are seated
Rim diame-
ter
(Wheel
diameter) Nominal diameter of the
bead seat
Rim size des-
ignation Rim diameter and widthTire related
term Meaning

4158-1. Specifications
LEXUS NX300h Owners Manu-
al_USA_OM78212U 8
Vehicle specifications Rim type
designation The industry manufac-
turer’s designation for a rim
by style or code
Rim width Nominal 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
side The 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-
ration A breakdown of the bond
between components in the
beadTire related
term Meaning
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
Cord The strands forming the
plies in the tire
Cord sepa-
ration The 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 tireTire related
term Meaning

416 8-1. Specifications
LEXUS NX300h Owners Manu-
al_USA_OM78212U Groove The space between two
adjacent tread ribs
Innerliner The layer(s) forming the
inside surface of a tubeless
tire that contains the inflat-
ing medium within the tire
Innerliner
separation The parting of the innerliner
from cord material in the
carcass
Intended
outboard
sidewall (a) The sidewall that con-
tains a whitewall, bears
white lettering, or bears
manufacturer, brand, and/or
model name molding that is
higher or deeper than the
same molding on the other
sidewall of the tire, or
(b) The outward facing side-
wall of an asymmetrical tire
that has a particular side
that must always face out-
ward when mounted on a
vehicle
Light truck
(LT) tire A tire designated by its
manufacturer as primarily
intended for use on light-
weight trucks or multipur-
pose passenger vehicles
Load rating The maximum load that a
tire is rated to carry for a
given inflation pressure
Maximum
load rating The load rating for a tire at
the maximum permissible
inflation pressure for that
tireTire related
term Meaning
Maximum
permissible
inflation
pressure The maximum cold inflation
pressure to which a tire may
be inflated
Measuring
rim The rim on which a tire is fit-
ted for physical dimension
requirements
Open splice Any parting at any junction
of tread, sidewall, or inner-
liner that extends to cord
material
Outer diam-
eter The overall diameter of an
inflated new tire
Overall
width The linear distance between
the exteriors of the sidewalls
of an inflated tire, including
elevations due to labeling,
decorations, or protective
bands or ribs
Passenger
car tire A tire intended for use on
passenger cars, multipur-
pose passenger vehicles,
and trucks, that have a gross
vehicle weight rating
(GVWR) of 10,000 lb. or
less.
Ply A layer of rubber-coated
parallel cords
Ply separa-
tion A parting of rubber com-
pound between adjacent
pliesTire related
term Meaning

4178-1. Specifications
LEXUS NX300h Owners Manu-
al_USA_OM78212U 8
Vehicle specifications
*
:Table 1 ⎯ Occupant loading and distri-
bution for vehicle normal load for vari-
ous designated seating capacitiesPneumatic
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
Sidewall That portion of a tire
between the tread and bead
Sidewall sep-
aration The parting of the rubber
compound from the cord
material in the sidewallTire related
term Meaning
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 rib A tread section running cir-
cumferentially around a tire
Tread sepa-
ration Pulling 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 fixture The fixture used to hold the
wheel and tire assembly
securely during testingTire related
term Meaning

4298-3. Initialization
LEXUS NX300h Owners Manu-
al_USA_OM78212U 8
Vehicle specifications 8-3.Initialization
*
:If equippedItems to initialize The following items must be initialized for normal system operation after such
cases as the 12-volt battery being re connected, or maintenance being per-
formed on the vehicle.
List of the items to initialize Item When to initialize Reference
Message indicating maintenance is
required (U.S.A. only) • After the maintenance is per-
formed P.319
Tire pressure warning system • When rotating the tires on vehi-
cles with differing front and rear
tire inflation pressures
• When changing the tire inflation
pressure by changing traveling
speed or load weight, etc.
•When changing the tire size P.341
Oil maintenance • After the maintenance is per-
formed P.329
Lexus parking assist monitor *
• After reconnecting or changing
the 12-volt battery
• After changing a fuse Refer to the
“NAVIGA-
TION AND
MULTIME-
DIA SYS-
TEM
OWNER’S
MANUAL”.Panoramic view monitor *
Power back door *
P.116
Power window
• When functioning abnormally P.144
Moon roof *
P.147