2010 Lexus GS450h spare tire

5
When trouble arises
565
5-2. Steps to take in an emergency
GS_HV_U (OM30C81U)
October 13, 2015 12:41 pm
Installing the spare tire
Remove any dirt or foreign matter
from the wheel contact surface.
If foreign matter is on the wheel
contact surface, the wheel nuts
may loosen while the vehicle is in
motion, and the tire may come off
the vehicle.
Install the spare tire and loosely
tighten each wheel nut by hand to
approximately the same amount.
Tighten the wheel nuts until the
tapered portion comes into loose
contact with the disc wheel sheet.
Lower the vehicle.
STEP1
STEP2
Disc wheel 
sheet Tapered portion
STEP3

566
5-2. Steps to take in an emergency
GS_HV_U (OM30C81U)
October 13, 2015 12:41 pm
Firmly tighten each nut two or
three times in the order shown in
the illustration.
Tightening torque:
76 ft•lbf (103 N•m, 10.5 kgf•m)
Stow the flat tire, tire jack and all tools.
STEP4
■If you have a flat rear tire on a road covered with snow or ice
Install the compact spare tire on the front of the vehicle. Perform the following steps
and fit tire chains to the rear tires.
Replace a front tire with the compact spare tire.
Replace the flat rear tire with the tire removed from the front of the vehi-
cle.
Fit tire chains to the rear tires.
■After completing the tire change
The tire pressure warning system must be reset. (P. 4 76 )
STEP5
STEP1
STEP2
STEP3

568
5-2. Steps to take in an emergency
GS_HV_U (OM30C81U)
October 13, 2015 12:41 pm
CAUTION
■When using the compact spare tire
●Remember that your spare tire is specifically designed for use with your vehicle.
Do not use your spare tire on another vehicle.
●Do not use two spare tires simultaneously.
●Replace the spare tire with a standard tire as soon as possible.
●Avoid sudden acceleration, deceleration and braking, as well as sharp cornering.
■Speed limit when using the compact spare tire
Do not drive at speeds in excess of 50 mph (80 km/h) when a compact spare tire is
installed on the vehicle.
The compact spare tire is not designed for driving at high speeds. Failing to observe
this precaution may lead to an accident causing death or serious injury.
■When the compact spare tire is attached
The vehicle speed may not be correctly detected, and the following systems may
not operate correctly:
●ABS
●Brake assist
●Enhanced VSC
●TRAC
●EPS
●VGRS
●VDIM
●Cruise control (if equipped)
●Dynamic radar cruise control (if equipped)
●Navigation system (if equipped)
●Intuitive parking assist (if equipped)
●Rear view monitor system
●Active stabilizer suspension system (if equipped)
●AV S

5
When trouble arises
569
5-2. Steps to take in an emergency
GS_HV_U (OM30C81U)
October 13, 2015 12:41 pm
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 damaging the tire pressure warning valves and transmitters
Do not use liquid sealants on flat tires.

570
5-2. Steps to take in an emergency
GS_HV_U (OM30C81U)
October 13, 2015 12:41 pm
If you have a flat tire (Vehicles with run-flat tires)
■In some condition (such as at high temperatures)
You can not continue driving for up to 100 miles (160 km).
■Spare tire
A spare tire is not provided on the vehicle with run-flat tires.
■If you cannot distinguish between standard tires and run-flat tires
Consult your Lexus dealer.
■For detailed information on run-flat tires
See the tire warranty book.
Take your vehicle to the nearest Lexus dealer or authorized tire dealer as
soon as possible.
■Run-flat tires (A “RFT” or “DSST” mark is molded on the sidewall)
You can continue driving the
vehicle with run-flat tires even if
any tire goes flat.
The vehicle is able to run for a
maximum of 100 miles (160 km)
at a speed below 55 mph (90
km/h) after the tire pressure
warning light comes on. 
(P. 5 3 7 )

596
6-1. Specifications
GS_HV_U (OM30C81U)
February 1, 2010 11:10 am
Steering
Tires and wheels
Free playLess than 1.2 in. (30 mm)
Ti r e s i z e
245/40R18 93Y, 245/40RF18 93Y, 
P245/40R18 93V, P245/40RF18 93V,
245/40ZR18, T155/70D17 110M (spare)
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 per-
mitted by law)
Add 9 psi (60 kPa, 0.6 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.
Spare tire inflation pressure
(Recommended cold tire inflation
pressure)
60 psi (420 kPa, 4.2 kgf/cm2 or bar)
Wheel size18  8J, 17  4T (spare)
Wheel nut torque76 ft•lbf (103 N•m, 10.5 kgf•m)

602
6-1. Specifications
GS_HV_U (OM30C81U)
February 1, 2010 11:10 am
Tire size (P. 6 0 4 )
DOT and Tire Identification Number (TIN) (P. 603)
Location of treadwear indicators (P. 4 7 5 )
Run-flat tire (RFT) or standard tire (P. 570)
This vehicle can be equipped with either run-flat tires (RFT) or standard
tires. A “RFT” or “DSST” mark is molded on the sidewall of the run-flat tire.
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 filled in 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. 6 0 8 )
Maximum cold tire inflation pressure (P. 6 0 8 )
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. 480)
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 into its sidewall. This tire is designed for temporary emer-
gency use only.

636
Alphabetical index
GS_HV_U (OM30C81U)
February 1, 2010 11:29 am
Safety Connect ......................................433
Seat belts
Adjusting the seat belt........................ 75
Automatic locking retractor............ 78
Child restraint system 
installation ............................................128
Cleaning and maintaining 
the seat belts ..................................... 446
Emergency locking retractor ......... 78
How to wear your seat belt............. 75
How your child should wear 
the seat belt .......................................... 78
Pre-collision seat belts ........................ 77
Pregnant women, 
proper seat belt use......................... 78
Reminder light .....................................536
Seat belt extenders .............................. 79
Seat belt pretensioners ....................... 77
Seat heaters/ventilators...................... 414
Seating capacity ..................................... 413
Seats
Adjustment............................................... 65
Adjustment precautions .................... 66
Child seats/child restraint 
system installation ............................128
Cleaning................................................. 445
Driver’s seat position memory....... 67
Head restraint.......................................... 72
Properly sitting in the seat .............. 105
Seat heaters ............................................ 413
Service reminder indicators ............. 165Shift lever
If the shift lever cannot be 
shifted from “P” ................................573
Transmission.......................................... 154
Shift lock system.................................... 573
Shopping bag hooks ............................. 421
Side airbags ..............................................107
Side marker lights
Switch .......................................................... 171
Side mirror
Adjusting and folding ......................... 85
Mirror position memory .................... 67
Smart access system with 
push-button start
Antenna location ................................... 43
Entry function ............................................41
Starting the 
hybrid system.....................................150
Spare tire
Inflation pressure ............................... 596
Storage location .................................. 561
Spark plug ............................................... 593
Specifications .........................................588
Speedometer ............................................ 161
Steering wheel
Adjustment ...............................................82
Audio switches ....................................342
Steering wheel position 
memory .................................................. 67
Storage compartment ........................ 403
Storage feature ..................................... 398
Stuck
If your vehicle becomes stuck .... 584
Sun visors ................................................. 406S