tires LEXUS RX450h 2015 Service Manual

5
When trouble arises
7935-2. Steps to take in an emergency
If the vehicle becomes stuck
■
When it is difficult to free the vehicleCarry out the following procedures if the tires spin or the vehicle becomes
stuck in mud, dirt or snow:
Stop the hybrid system. Set the parking brake and shift the shift
lever to P.
Remove the mud, snow or sand from around the front wheels.
Place wood, stones or some ot her material under the front
wheels to help provide traction.
Restart the hybrid system.
Shift the shift lever to the D or R position and release the park-
ing brake. Then, while exercising caution, depress the acceler-
ator pedal.STEP 1
STEP 2
STEP 3
STEP 4
STEP 5
Press the VSC off switch to turn off TRAC.

8076-1. Specifications
6
Vehicle specifications Tires and wheels
Type A
Type BTi r e s i z e P235/60R18 102V, T165/90D18 107M (spare)
Tire inflation pressure
(recommended cold tire
inflation pressure) Front: 33 psi (230 kPa, 2.3 kgf/cm 2
or bar)
Rear: 33 psi (230 kPa, 2.3 kgf/cm 2
or bar)
Spare: 60 psi (420 kPa, 4.2 kgf/cm 2
or bar)
Wheel size 18  7 1 /2J, 18  4T (spare)
Wheel nut torque 76 ft•lbf (103 N•m, 10.5 kgf•m)
Ti r e s i z e P235/60R18 102V
Tire inflation pressure
(recommended cold tire
inflation pressure) Front: 33 psi (230 kPa, 2.3 kgf/cm 2
or bar)
Rear: 33 psi (230 kPa, 2.3 kgf/cm 2
or bar)
Spare: 33 psi (230 kPa, 2.3 kgf/cm 2
or bar)
Wheel size 18  7 1 /2J
Wheel nut torque 76 ft•lbf (103 N•m, 10.5 kgf•m)

8086-1. Specifications
Ty p e C
Ty p e DTi r e s i z e P235/55R19 101V, T165/90D18 107M (spare)
Tire inflation pressure
(recommended cold tire
inflation pressure) Driving under normal conditions
Front: 33 psi (230 kPa, 2.3 kgf/cm 2
or bar)*
Rear: 33 psi (230 kPa, 2.3 kgf/cm 2
or bar)*
Spare: 60 psi (420 kPa, 4.2 kgf/cm 2
or bar)*: When driving at high speeds above 100 mph (160
km/h), in countries where such speeds are permitted by
law, add 3 psi (20 kPa, 0.2 kgf/cm 2
or bar) to the tires.
Never exceed the maximum cold tire inflation pressure
indicated on the tire sidewall.
Wheel size 19  7 1 /2J, 18  4T (spare)
Wheel nut torque 76 ft•lbf (103 N•m, 10.5 kgf•m)
Ti r e s i z e P235/55R19 101V
Tire inflation pressure
(recommended cold tire
inflation pressure) Driving under normal conditions
Front: 33 psi (230 kPa, 2.3 kgf/cm 2
or bar)
Rear: 33 psi (230 kPa, 2.3 kgf/cm 2
or bar)
Spare: 33 psi (230 kPa, 2.3 kgf/cm 2
or bar)
When driving at high speeds above 100 mph (160 km/h),
in countries where such speeds are permitted by law,
add 3 psi (20 kPa, 0.2 kgf/cm 2
or bar) to the front tires
and rear tires. Never exceed the maximum cold tire
inflation pressure indicated on the tire sidewall.
Wheel size 19  7 1 /2J
Wheel nut torque 76 ft•lbf (103 N•m, 10.5 kgf•m)

8146-1. Specifications
Tire size (  P. 815)
DOT and Tire Identification Number (TIN) (  P. 815)
Location of treadwear indicators (  P. 670)
Tire ply composition and materials Plies are layers of rubber-coated parallel cords. Cords are the strands
which form the plies in a tire.
Radial tires or bias-ply tires A radial tire has “RADIAL” on the sidewall. A tire not marked “RADIAL” is
a bias-ply tire.
TUBELESS or TUBE TYPE A tubeless tire does not have a tube and air is directly put into the tire. A
tube type tire has a tube inside the ti re and the tube maintains the air pres-
sure.
Load limit at maximum cold tire inflation pressure (  P. 6 74 )
Maximum cold tire inflation pressure (  P. 8 0 7 )This means the pressure to which a tire may be inflated.
Uniform tire quality grading For details, see “Uniform tire quality grading” that follows.
Summer tire or all season tire (  P. 6 74 )An all season tire has “M+S” on the sidewall. A tire not marked “M+S” is a
summer tire.
“TEMPORARY USE ONLY” (  P. 772)A compact spare tire is identified by the phrase “TEMPORARY USE
ONLY” molded on its sidewall. This ti re is designed for temporary emer-
gency use only.

8176-1. Specifications
6
Vehicle specifications Uniform Tire Quality Grading
This information has b een prepared in accorda nce with regulations
issued by the National Highway Traf fic Safety Administration of the U.S.
Department of Transportation.
It provides the purchasers and/or prospective purchasers of Lexus vehi-
cles with information on uniform tire quality grading. Your Lexus dealer will help answer an y questions you may have as you read
this information.
■ DOT quality grades
All passenger vehicle tires must co nform to Federal Safety Require-
ments 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 controll ed conditions on a specified gov-
ernment 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 performance of tires de pends upon the actual conditions of
their use, however, and may depart significantly from the norm due to varia-
tions in driving habits, service practices and differences in road characteris-
tics and climate.

8186-1. Specifications
■ 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 controlled condit ions on specif ied government 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) trac-
tion.
■ 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 conditions 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 sudden tire fail-
ure.
The grade C corresponds to a level of performance which all passenger car
tires must meet under the Federal Mo tor 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 properly inflated and not overloaded.
Excessive speed, underinflation, or excess ive loading, either separately or in
combination, can cause heat buildup and possible tire failure.

8376
Vehicle specifications 6-3. Initialization
Items to initialize Item When to initialize Reference
Power back door • After reconnecting or changing the
12-volt battery
• After changing a fuse P. 7 5
Maintenance data
(U.S.A. only) After the maintenance is performed P. 6 4 1
Tire pressure warning
system • When rotating the tires
• When changing tire pressure (such
as when changing traveling speed,
load weight, etc.)
• When changing the tire size P. 6 7 1The following items must be initialized for normal system operation in cases
such as after the 12-volt battery is reconnected, or maintenance is per-
formed on the vehicle.

868Alphabetical index
Parking assist sensors* .......................248
Parking brake .......................................... 195
Parking lights
Replacing light bulbs........................708
Switch ........................................................ 217
PCS
Function .................................................. 278
Pre-collision braking off
switch ................................................... 279
Warning light ....................................... 734
Personal lights
Switch ......................................................583
Phone*........................................... 429, 552
Power back door ..................................... 75
Power control unit coolant
Capacity ................................................ 804
Checking ...............................................659
Preparing and checking
before winter .................................... 302
Power easy access system................... 95
Power outlet............................................. 601
“POWER” switch.................................... 177
Power windows ........................................ 112
Pre-collision system
Function .................................................. 278
Pre-collision braking off
switch ................................................... 279
Warning light ....................................... 734 Radar cruise control............................ 236
Radiator ......................................................661
Radio* ............................................ 365, 477
Rear seat entert ainment system*
Rear seats
Folding down ......................................... 89
Seat adjustment..................................... 89
Rear turn signal lights
Replacing light bulbs ....................... 708
Wattage .................................................809
Rear view mirror
Compass ................................................622
Inside rear view mirror ..................... 107
Outside rear view mirrors ..............109
Rear view monitor
system* ...................................... 258, 266
Rear window defogger* ....................358
Rear window wiper.............................. 229
Remote Touch*
Replacing
Electronic key battery ..................... 687
Fuses ........................................................ 689
Light bulbs ............................................ 708
Tires...........................................................764
Wireless remote control
battery ................................................. 687
Reporting safety defects for
U.S. owners..........................................840
Reset the maintenance data ..............641
Roof luggage carrier........................... 296P R

871Alphabetical index
Tachometer .............................................. 197
Tail lights
Replacing light bulbs ....................... 708
Switch ........................................................ 217
Wattage ................................................ 809
Talk switch*.................................. 429, 553
Telephone* .................................. 429, 552
Telephone switch* .................... 429, 553
Theft deterrent system
Alarm ......................................................... 126
Immobilizer system ............................ 124
Theft prevention labels ........................ 129
Tire inflation pressure..........................679
Tire information
Glossary ..................................................819
Size ............................................................ 815
Tire identification number .............. 815
Uniform tire quality grading........... 817
Tires
Chains ..................................................... 302
Checking ............................................... 670
If you have a flat tire.......................... 764
Inflation pressure ............................... 679
Inflation pressure sensor.................. 671
Information..............................................813
Replacing............................................... 764
Rotating tires ........................................ 670
Size ........................................................... 807
Snow tires.............................................. 302
Spare tire ............................................... 764
Tire pressure warning
system...................................... 670, 736 Tools ........................................................... 764
Total load capacity ................................ 301
Towing
Dinghy towing ..................................... 324
Emergency towing............................ 725
Trailer towing ...................................... 306
TRAC...........................................................271
Traction control .......................................271
Trailer towing ............................. 306, 323
Trip information display......................206
Trip meter ..................................................197
Turn signal lights
Replacing light bulbs ....................... 708
Switch........................................................ 193
Wattage ................................................. 809T
*: For vehicles with a navigation system, refer to the “Navigation System Owner’s Manual”.