flat tire Lexus HS250h 2012 Service Manual

540
5-2. Steps to take in an emergency
HS250h_U_75050U
CAUTION
• Have the wheel nuts tightened with a torque wrench to 76 ft•lbf (103 N•m,10.5 kgf•m) as soon as possible after changing wheels.
• When installing a tire, only use wheel nuts that have been specifically designed for that wheel.
• If there are any cracks or deformations in the bolt screws, nut threads or bolt holes of the wheel, have the vehicle inspected by your Lexus dealer.
NOTICE
■Do not drive the vehicle with a flat tire
Do not continue driving with a flat tire.
Driving even a short distance with a flat tire can damage the tire and the wheel
beyond repair.
■Be careful when driving over bumps with the compact spare tire installed on the
vehicle.
The vehicle becomes lower when driving with the compact spare tire compared to
when driving with standard tires. Be careful when driving over uneven road sur-
faces.
■Driving with tire chains and the compact spare tire
Do not fit tire chains to the compact spare tire.
Tire chains may damage the vehicle body and adversely affect driving performance.
■When replacing the tires
When removing or fitting the wheels, tires or the tire pressure warning valve and
transmitter, contact your Lexus dealer as the tire pressure warning valve and trans-
mitter may be damaged if not handled correctly.
■To avoid damage to the tire pressu re warning valves and transmitters
When a tire is repaired with liquid sealants, the tire pressure warning valve and
transmitter may not operate properly. If a liquid sealant is used, contact your Lexus
dealer or other qualified service shop as soon as possible. Make sure to replace the
tire pressure warning valve and transmitter when replacing the tire. ( →P. 4 5 2 )

567
6-1. Specifications
6
Vehicle specifications
HS250h_U_75050U
Tires and wheels
Ty p e A
Ty p e B
Ti r e s i z eP215/55R17 93V, T145/70D17 106M (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)
Wheel size17 × 7J, 17 × 4T (spare)
Wheel nut torque76 ft•lbf (103 N•m, 10.5 kgf•m)
Ti r e s i z eP225/45R18 91W, T145/ 70D17 106M (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:
32 psi (220 kPa, 2.2 kgf/cm
2 or bar)
Spare:
60 psi (420 kPa, 4.2 kgf/cm
2 or bar)
Wheel size18 × 7 1 /2J, 17 × 4T (spare)
Wheel nut torque76 ft•lbf (103 N•m, 10.5 kgf•m)

573
6-1. Specifications
6
Vehicle specifications
HS250h_U_75050U
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 tire and the tube maintains the air pres-
sure.
Load limit at maximum cold tire inflation pressure ( →P. 455)
Maximum cold tire inflation pressure (→ P. 567)
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 tires or all season tires (→ P. 455)
An all season tire has “M+S” on the sidewall. A tire not marked “M+S” is a
summer tire.
“TEMPORARY USE ONLY” (→ P. 5 3 7 )
A compact spare tire is identified by the phrase “TEMPORARY USE
ONLY” molded on its sidewall. This tire is designed for temporary emer-
gency use only.

578
6-1. Specifications
HS250h_U_75050U
Warning: The temperature grades of a tire assume that it is properly inflated
and not overloaded.
Excessive speed, underinflation, or excessive loading, either separately or in
combination, can cause heat buildup and possible tire failure.
Glossary of tire terminology
Tire related termMeaning
Cold tire inflation pres-
sureTire pressure when the vehicle 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 pres-
sureThe maximum cold inflated pressure to which a tire
may be inflated, shown on the sidewall of the tire
Recommended inflation
pressureCold tire inflation pressure recommended by a man-
ufacturer
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 vehicle 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 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 number of occupants speci-
fied in the second column of Table 1
* that follows

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6-1. Specifications
6
Vehicle specifications
HS250h_U_75050U
Occupant distributionDistribution 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
considered 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 designated seating capacity
Vehicle maximum load on
the tireThe 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 normal load on
the tire
The load on an individual tire that is determined by
distributing to each axle its share of curb weight,
accessory weight, and normal occupant weight (dis-
tributed 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
Ti r e r e l a t e d t e r mMeaning

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6-1. Specifications
HS250h_U_75050U
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 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 alternate 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 the plies in the tire
Cord separationThe parting of cords from adjacent rubber com-
pounds
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 tire
A 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 inside 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

581
6-1. Specifications
6
Vehicle specifications
HS250h_U_75050U
Intended outboard side-
wall
(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 side-
wall of the tire, or
(b) The outward facing sidewall of an asymmetrical
tire that has a particular side that must always
face outward when mounted on a vehicle
Light truck (LT) tire
A tire designated by its manufacturer as primarily
intended for use on lightweight trucks or multipur-
pose 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
inflation pressureThe maximum cold inflation pressure 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
innerliner 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 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.
PlyA layer of rubber-coated parallel cords
Ti r e r e l a t e d t e r mMeaning

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6-1. Specifications
HS250h_U_75050U
Ply separationA parting of rubber compound between adjacent
plies
Pneumatic tire
A mechanical device made of rubber, chemicals, fab-
ric 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 substantially 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 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
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
Te s t r i mThe rim on which a tire is fitted for testing, and may be
any rim listed as appropriate for use with that tire
Tr e a dThat portion of a tire that comes into contact with the
road
Tire related termMeaning

616
Alphabetical index
HS250h_U_75050U
Cooling systemEngine overheating .......................... 552
Cruise control Cruise control ....................................... 212
Dynamic radar crui se control ....... 216
Cup holders ............................................. 381
Curtain shield airbags.......................... 109
Customizable features ...................... 584
Daytime running light system ........... 194
Defogger* Rear window.........................................274
Side mirrors ...........................................274
Dimensions............................................. 560
Dinghy towing ........................................ 262
Display
Dynamic radar cruise control.................................................... 216
Multi-information display................. 177
Trip information ................................... 180
Warning message............................... 512
Do-it-yourself maintenance .............. 431
Door courtesy lights Door courtesy lights......................... 374
Wattage................................................. 568
Doors
Door glasses ........................................... 90
Door lock.................................. 47, 58, 61
Rear door child protector ................ 62
Side doors .................................................. 61
Side mirrors ............................................. 87
Driver’s seat belt reminder light .... 505
Driver’s seat position memory ........... 72
Driving
Break-in tips ........................................... 143
Correct posture ................................... 107 Procedures............................................. 142
Winter driving tips ............................ 258
Driving position memory.......................72
Electric power steering...................... 238
Electronic key If the electronic key does not operate properly............................ 544
Emergency, in case of If the electronic key does not
operate properly............................ 544
If the engine will not start ................. 541
If the hybrid system will not start ......................................................... 541
If the 12-volt battery is discharged .........................................547
If the warning buzzer sounds...... 502
If the warning light turns on.......... 502
If the warning message is displayed .............................................. 512
If you have a flat tire ........................ 532
If you lose your keys ........................ 543
If you think something is wrong ....................................................501
If your electronic key does not operate properly ................... 544
If your vehicle becomes stuck .... 556
If your vehicle has to be stopped in an emergency ............................558
If your vehicle needs to be
towed ................................................... 495
If your vehicle overheats................ 552
Emergency flasher Switch ...................................................... 494
Engine Accessory mode ................................. 153
D
E

621
Alphabetical index
HS250h_U_75050U
Seat heaters............................................ 389
Seat position memory ............................ 72
Seat ventilator........................................ 389
Seating capacity ....................................257
SeatsAdjustment .....................................68, 72
Adjustment precautions .................................... 71, 74
Child seats/child restraint system installation ............................130
Cleaning ................................................ 420
Driver’s seat position memory .................................................. 72
Head restraint .........................................75
Properly sitting in the seat............... 107
Seat heaters..........................................389
Seat position memory ......................... 72
Ventilated seats ..................................389
Service reminder indicators ............. 173
Shift lever Transmission ..........................................160
Side airbags ..............................................109
Side marker lights Replacing light bulbs .........................481
Switch ..........................................................191
Wattage .................................................568
Side mirrors Adjusting and folding ......................... 87
Mirror position memory .................... 72
Side turn signal lights
Replacing light bulbs ......................... 491
Wattage .................................................568
Smart access system with push-button start
Antenna location ...................................49 Entry functions........................................ 47
Starting the engine ............................. 152
Starting the hybrid system .............. 152
Smart entry & start system
Antenna location ................................... 49
Entry function .......................................... 47
Starting the engine ............................. 152
SOS button ............................................ 408
Spare tire Inflation pressure................................567
Storage location .................................532
Spark plug................................................565
Specifications .........................................560
Speedometer .......................................... 169
Steering wheel Adjustment ...............................................83
Audio switches.................................... 322
Manual adjustment...............................83
Power adjustment.................................83
Steering wheel position
memory .................................................. 72
Stop light
Replacing light bulbs ......................... 491
Wattage................................................. 568
Storage feature...................................... 377
Stuck If the vehicle becomes stuck ....... 556
Sun visors ................................................ 385
Sunshade Rear...........................................................392
Roof.............................................................. 93
Switch
Driving mode selector switch......................................................162
Engine switch ........................................ 152
*: For vehicles with a navigation system, refer to “Navigation System Owner’s Manual”.