5297-3. Do-it-yourself maintenance
7
Maintenance and care
NX300h_OM_USA_OM78082U
WA R N I N G
■When replacing wheels
●Do not use wheels that are a different size from those recommended in the Owner’s
Manual, as this may result in a loss of handling control.
●Never use an inner tube in a leaking wheel which is designed for a tubeless tire. Doing
so may result in an accident, causing death or serious injury.
■Use of defective wheels prohibited
Do not use cracked or deformed wheels.
Doing so could cause the tire to leak air during driving, possibly causing an accident.
NOTICE
■Replacing tire pressure warning valves and transmitters
●Because tire repair or replacement may affect the tire pressure warning valves and
transmitters, make sure to have tires serviced by your Lexus dealer or other qualified
service shop. In addition, make sure to pu rchase your tire pressure warning valves
and transmitters at your Lexus dealer.
●Ensure that only genuine Lexus wheels are used on your vehicle.
Tire pressure warning valves and transmitte rs may not work properly with non-genu-
ine wheels.
5718-2. Steps to take in an emergency
8
When trouble arises
NX300h_OM_USA_OM78082U
WA R N I N G
■Maintenance of the tires
Each tire, including the spare (if provided), should be checked monthly when cold and
inflated to the inflation pressure recomm ended by the vehicle manufacturer on the
vehicle placard or tire inflation pressure la bel (tire and load information label). (If your
vehicle has tires of a different size than the size indicated on the vehicle placard or tire
inflation pressure label [tire and load in formation label], you should determine the
proper tire inflation pressure for those tires.)
As an added safety feature, your vehicle has been equipped with a tire pressure moni-
toring system (TPMS-tire pressure warning system) that illuminates a low tire pressure
telltale (tire pressure warning light) when on e or more of your tires is significantly
under-inflated. Accordingly, when the low ti re pressure telltale (tire pressure warning
light) illuminates, you should stop and check your tires as soon as possible, and inflate
them to the proper pressure. Driving on a significantly under-inflated tire causes the
tire to overheat and can lead to tire failure. Under-inflation also reduces fuel efficiency
and tire tread life, and ma y affect the vehicle’s handling and stopping ability.
Please note that the TPMS (tire pressure wa rning system) is not a substitute for proper
tire maintenance, and it is the driver’s resp onsibility to maintain correct tire pressure,
even if under-inflation has no t reached the level to trigger illumination of the TPMS low
tire pressure telltale (tire pressure warning light).
Your vehicle has also been equipped with a TPMS (tire pressure warning system) mal-
function indicator to indicate when the system is not operating properly. The TPMS
(tire pressure warning system) malfunction indi cator is combined with the low tire pres-
sure telltale (tire pressure warning light). When the system detects a malfunction, the
telltale will flash for approximately one minu te and then remain continuously illumi-
nated. This sequence will cont inue upon subsequent 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) malfun ctions 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 functioning properly. Always
check the TPMS (tire pressure warning syst em) 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 specificatio ns or makers, as the tire pressure warning
system may not operate properly.
6139-1. Specifications
9
Vehicle specifications
NX300h_OM_USA_OM78082U
Ty p e A
Ty p e B
Steering
Free playLess than 1.2 in. (30 mm)
Tires and wheels
Ti r e s i z e225/65R17 102H
Tire inflation pressure
(Recommended cold tire
inflation pressure)
Driving under normal conditions
Front
35 psi (240 kPa, 2.4 kgf/cm2 or bar)
Rear
35 psi (240 kPa, 2.4 kgf/cm2 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/cm2 or bar) to the front
and rear tires. Never exceed the maximum cold
tire inflation pressure in dicated on the tire side-
wall.
Wheel size17 7 J
Wheel nut torque76 ft•lbf (103 N•m, 10.5 kgf•m)
Ti r e s i z e225/60R18 100H
Tire inflation pressure
(Recommended cold tire
inflation pressure)
Driving under normal conditions
Front
32 psi (220 kPa, 2.2 kgf/cm2 or bar)
Rear
32 psi (220 kPa, 2.2 kgf/cm2 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/cm2 or bar) to the
front and rear tires. Never exceed the maximum
cold tire inflation pressure indicated on the tire
sidewall.
Wheel size18 7 1 /2 J
Wheel nut torque76 ft•lbf (103 N•m, 10.5 kgf•m)
6149-1. Specifications
NX300h_OM_USA_OM78082U
Compact spare tire
Ti r e s i z eT165/80D17 104M
Spare tire inflation pressure
(Recommended cold tire
inflation pressure)
60 psi (420 kPa, 4.2 kgf/cm2 or bar)
Wheel size17 4 T
Wheel nut torque76 f t•lbf (103 N•m, 10.5 kgf•m)
6229-1. Specifications
NX300h_OM_USA_OM78082U
■Typical tire size information
The illustration indicates typical tire size. Ti r e u s e
(P = Passenger car,
T = Temporary use)
Section width (millimeters)
Aspect ratio
(tire height to section width)
Tire construction code
(R = Radial, D = Diagonal)
Wheel diameter (inches)
Load index (2 digits or 3 digits)
Speed symbol (alphabet with one letter)
■Tire dimensionsSection width
Tire height
Wheel diameter
Tire size
1
2
3
4
5
6
7
1
2
3
6269-1. Specifications
NX300h_OM_USA_OM78082U
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 levelers, roof rack, heavy duty
12-volt 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 designated 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
We a t h e r s i d eThe 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 and that is shaped to fit the
rim
Tire related termMeaning
677Alphabetical index
NX300h_OM_USA_OM78082U
Warning buzzersApproach warning ............... 245, 259
Downshifting ......................................... 210
Intuitive parking assist ......................282
Light reminder .......................................221
Open door ............................................. 128
Seat belt reminder .............................567
Warning lights ABS .......................................................... 566
Brake hold operated indicator ............................................. 566
Brake Override System .................567
Brake system....................................... 565
Charging system............................... 565
Drive-Start Control...........................567
Electric power steering.................. 566
High coolant temperature............ 565
Low engine oil pressure ................ 565
Low fuel level .......................................567
Malfunction indicator lamp .......... 565
Master warning light.........................567
Parking brake indicator ................. 566
PCS warning light ............................ 566
Seat belt reminder light...................567
Slip indicator ........................................ 566
SRS ........................................................... 566
Tire pressure ........................................567 Warning messages...............................572
Washer
Checking .................................................. 511
Low washer fluid warning message.................. 511, 572
Preparing and checking before winter .................................... 326
Switch .......................................... 228, 234
Washing and waxing .......................... 484
Weights Cargo capacity........................ 182, 606
Load limits ..................................186, 606
Weights ................................................. 606
Wheels ..................................................... 528 Replacing wheels ..............................528
Size .............................................................613
Window glasses...................................... 166
Window lock switch.............................. 166
Windows Power windows....................................166
Rear window defogger .................. 435
Washer ....................................... 228, 234
Windshield wiper de-icer ................. 436
Windshield wipers Intermittent windshield wipers .... 228
Rain-sensing windshield wipers................................................... 230
Winter driving tips ................................326
Wireless charger.................................. 458
W