tire LEXUS RX450H 2020 Owners Manual

7169-1. Specifications
RX350/RX350L_U
Glossary of tire terminology
Tire related termMeaning
Cold tire inflation pressure
Tire pressure when the vehicle has been parked for
three hours or more, or has no t been driven more than 1
mile or 1.5 km un der that condition
Maximum inflation pres-
sureThe maximum cold inflated pr essure to which a tire may
be inflated, shown on the sidewall of the tire
Recommended inflation
pressureCold tire inflation pressure recommended by a manu-
facturer
Accessory weight
The combined weight (in exce ss of those standard items
which may be replaced) of automatic 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 vehicle with standard equipment,
including the maximum capacity of fuel, oil and coolant,
and if so equipped, air co nditioning and additional
weight optional engine
Maximum loaded vehicle
weight
The sum of:
(a) Curb weight
(b) Accessory weight
(c) Vehicle capacity weight
(d) Production options weight
Normal occupant weight150 lb. (68 kg) times the numb er of occupants specified
in the second column of Table 1* that follows
Occupant distributionDistribution of occupants in a vehicle as specified in the
third column of Table 1
* below

7179-1. Specifications
9
Vehicle specifications
RX350/RX350L_U
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 re place, not previously con-
sidered in curb weight or accessory weight, including
heavy duty brakes, ride levelers, roof rack, heavy duty
battery, and special trim
RimA metal support for a tire or a tire and tube assembly
upon which the tire beads are seated
Rim diameter
(Wheel diameter)Nominal diameter of the bead seat
Rim size designationRim diameter and width
Rim type designationThe industry manufacturer’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 luggage load plus 150 lb. (68 kg)
times the vehicle’s desi gnated seating capacity
Vehicle maximum load on
the tireThe load on an individual tire that is determined by dis-
tributing to each axle its share of the maximum loaded
vehicle weight, and dividing by two
Vehicle normal load on the
tire
The load on an individual tire that is determined by dis-
tributing to each axle its sh are of curb weight, accessory
weight, and normal occupant weight (distributed in
accordance with Table 1
* below), and dividing by two
Weather sideThe surface area of the rim not covered by the inflated
tire
BeadThe part of the tire that is made of steel wires, wrapped
or reinforced by ply cords an d that is shaped to fit the
rim
Tire related termMeaning

7189-1. Specifications
RX350/RX350L_U
Bead separationA breakdown of the bond between components in the
bead
Bias ply tire
A pneumatic tire in which the ply cords that extend to
the beads are laid at altern ate angles substantially less
than 90 degrees to the centerline of the tread
CarcassThe tire structure, except tread and sidewall rubber
which, when inflated, bears the load
ChunkingThe breaking away of pieces of the tread or sidewall
CordThe strands forming th e plies in the tire
Cord separationThe parting of cords from adjacent rubber compounds
CrackingAny 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 tireA tire designed to operate at higher loads and at higher
inflation pressures than the corresponding standard tire
GrooveThe space between two adjacent tread ribs
InnerlinerThe layer(s) forming the insi de surface of a tubeless tire
that contains the inflating medium within the tire
Innerliner separationThe parting of the innerliner from cord material in the
carcass
Tire related termMeaning

7199-1. Specifications
9
Vehicle specifications
RX350/RX350L_U
Intended outboard sidewall
(a) The sidewall that contains 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 sidewall of an asymmetrical tire
that has a particular side that must always face out-
ward when mounted on a vehicle
Light truck (LT) tireA tire designated by its manufacturer as primarily
intended for use on lightweig ht trucks or multipurpose
passenger vehicles
Load ratingThe maximum load that a tire is rated to carry for a given
inflation pressure
Maximum load ratingThe load rating for a tire at the maximum permissible
inflation pressure for that tire
Maximum permissible infla-
tion pressureThe maximum cold inflation pr essure to which a tire may
be inflated
Measuring rimThe rim on which a tire is fitted for physical dimension
requirements
Open spliceAny parting at any junction of tread, sidewall, or inner-
liner that extends to cord material
Outer diameterThe overall diameter of an inflated new tire
Overall width
The linear distance between the exteriors of the side-
walls of an inflated tire, including elev ations due to label-
ing, decorations, or protective bands or ribs
Passenger car tireA tire intended for use on passenger cars, multipurpose
passenger vehicles, and trucks, that have a gross vehicle
weight rating (GVWR) of 10,000 lb. or less.
PlyA layer of rubber-coat ed parallel cords
Ply separationA parting of rubber compou nd between adjacent plies
Tire related termMeaning

7209-1. Specifications
RX350/RX350L_U
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 tireA pneumatic tire in which the ply cords that extend to
the beads are laid at substa ntially 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 widthThe linear distance between the exteriors of the side-
walls of an inflated tire, excluding elevations due to
labeling, decoration, or protective bands
SidewallThat portion of a tire between the tread and bead
Sidewall separationThe parting of the rubber compound from the cord
material in the sidewall
Snow tire
A tire that attains a traction index equal to or greater
than 110, compared to the ASTM E-1136 Standard Ref-
erence 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 rimThe rim on which a tire is fitted for testing, and may be
any rim listed as appropriate for use with that tire
TreadThat portion of a tire that comes into contact with the
road
Tread ribA tread section running circ umferentially around a tire
Tire related termMeaning

7219-1. Specifications
9
Vehicle specifications
RX350/RX350L_U
*:Table 1  Occupant loading and distribution for vehicle normal load for various des-
ignated seating capacities
Tread separationPulling 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-holding fixtureThe fixture used to hold the wheel and tire assembly
securely during testing
Tire related termMeaning
Designated seating capac-
ity, Number of occupantsVehicle normal load, Num- ber of occupantsOccupant distribution in a normally loaded vehicle
2 through 422 in front
5 through 1032 in front, 1 in second seat
11 through 1552 in front, 1 in second seat, 1 in third seat, 1 in fourth seat
16 through 2072 in front, 2 in second seat, 2 in third seat, 1 in fourth
seat

735
RX350/RX350L_U
9
Vehicle specifications
9-3. Initialization
*:If equipped
Items to initialize
The following items must be initialized for normal system operation after such
cases as the battery being reconnected, or maintenance being performed on
the vehicle.
ItemWhen to initializeReference
Message indicating mainte-
nance is required (U.S.A. only)• After the maintenance is per- formedP. 585
Tire pressure warning system
• When changing the tire inflationpressure by changing traveling
speed
• When changing the tire size
• When rotating the tires
P. 606
Oil maintenance• After the maintenance is per- formedP. 597
Intelligent Clearance Sonar
(ICS)
*
• After reconnecting or changingthe batteryP. 347
Power back door• After reconnecting or changingthe batteryP. 138

746
RX350/RX350L_U
AVERTISSEMENT
■Précautions relatives aux coussins gonflables SRS
●Ne suspendez aucun cintre ou objet dur aux crochets à vêtements. Tous ces objets
pourraient se transformer en projectiles et causer des blessures graves, voire mor-
telles en cas de déploiement des coussins gonflables rideaux SRS.
●Si un cache en vinyle est placé sur la zone où le coussin gonflable de genoux SRS se
déploie, assurez-vous de le retirer.
●N'utilisez aucun accessoire de siège reco uvrant les zones de déploiement des cous-
sins gonflables latéraux SRS et du coussin gonflable de coussin de siège SRS, car il
risque de gêner le déploiement des coussi ns gonflables SRS. De tels accessoires
peuvent empêcher les coussins gonflables la téraux et le coussin gonflable de coussin
de siège SRS de s'activer correctement, désactiver le système ou entraîner le
déploiement accidentel des coussins gonfla bles latéraux et du coussin gonflable de
coussin de siège SRS, occasionnant de s blessures graves, voire mortelles.
●Évitez de faire subir des chocs ou des pr essions excessives aux parties autour des
composants de coussins gonflables SRS ou aux portes avant.
En effet, cela pourrait entraîner un dysfonctionnement des coussins gonflables SRS.
●Ne touchez aucun composant immédiatement après le déploiement (gonflage) des
coussins gonflables SRS, car ils peuvent être chauds.
●Ne fixez rien et ne posez rien sur des empla-
cements tels que la plan che de bord, la garni-
ture du volant et la partie inférieure du
tableau de bord.
Ces éléments peuvent se transformer en pro-
jectiles lorsque les coussins gonflables
conducteur, passager avant et genoux SRS se
déploient.
●Ne fixez rien aux portes, à la vitre du pare-
brise, aux vitres latérales, aux montants avant
et arrière, au rail latéral de toit et à la poignée
de maintien.

755What to do if... (Troubleshooting)
RX350/RX350L_U
●Stop the vehicle in a safe place and replace the flat tire with the spare tire.
( P. 666)
●Try the procedure for when the vehicle becomes stuck in mud, dirt, or snow.
( P. 695)
When a problem has occurred
If you have a flat tire
The vehicle becomes stuck

762Alphabetical index
RX350/RX350L_U
Eco drive mode ..................................... 373
Eco Driving Indicator........................... 105
EDR (Event data recorder) ...................10
Electric Power Steering (EPS) ....... 378Warning light ...................................... 655
Electronic key ......................................... 120 Battery-saving function .....................147
If the electronic key does not operate properly............................ 684
Replacing the battery .......................623
Emergency flashers ............................. 644
Emergency, in case of If a warning buzzer sounds.......... 654
If a warning light turns on.............. 654
If a warning message is displayed.............................................. 661
If the battery is discharged ........... 687
If the electronic key does not operate properly............................ 684
If the engine will not start............... 682
If you have a flat tire ......................... 666
If you lose your keys .................. 121, 123
If you think something is wrong ...................................................652
If your vehicle becomes stuck .... 695
If your vehicle has to be stopped in an emergency .. 645
If your vehicle needs to be towed................................................... 646
If your vehicle overheats ................692 Engine
ACCESSORY mode ..................... 232
Compartment ..................................... 594
Engine switch ........................................ 231
Hood........................................................ 592
How to start the engine.................... 231
Identification number.......................700
If your vehicle has to be stopped in an emergency.......... 645
Ignition switch (engine switch) ..... 231
Overheating......................................... 692
Engine coolant Capacity................................................. 702
Checking .............................................. 598
Preparing and checking before winter ....................................384
Engine coolant temperature gauge ........................................................ 86
Engine immobilizer system .................. 74
Engine oil Capacity.................................................700
Checking ...............................................595
Preparing and checking before winter ....................................384
Engine oil maintenance data ............597
Engine switch ........................................... 231
Enhanced VSC ..................................... 378
EPS (Electronic Power Steering) ........ 378 Warning light .......................................655
Event data recorder (EDR)................... 10
E