2007 Lexus IS250 tire pressure

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4-2. Maintenance
4
Maintenance and care
Vehicle exterior
ItemsCheck points
Steering wheel
• Moves smoothly?
• Has correct free play?
• No strange noises?
ItemsCheck points
Door/trunk• Operate smoothly?
Engine hood• The lock system works properly?
Fluid leaks• Is there any leakage after parking?
Ti r e
• Inflation pressure is correct?
• Tire surfaces not worn or dam-
aged?
• Tires rotated according to the
maintenance schedule?
• Wheel nuts are not loose?
CAUTION
■If the engine is running
Turn the engine off and ensure that there is adequate ventilation before performing
maintenance checks.

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4-3. Do-it-yourself maintenance
CAUTION
The engine compartment contains many mechanisms and fluids that may move sud-
denly, become hot, or become electrically energized. To avoid death or serious injury,
observe the following precautions.
■When working on the engine compartment:
●Keep hands, clothing, and tools away from the moving fan and engine drive belt.
●Be careful not to touch the engine, radiator, exhaust manifold, etc. right after driv-
ing as they may be hot. Oil and other fluids may also be hot.
●Do not leave anything that may burn easily, such as paper or rags, in the engine
compartment.
●Do not smoke, cause sparks or expose an open flame to fuel or the battery. Fuel
and battery fumes are flammable.
●Be extremely cautious when working on the battery. It contains poisonous and
corrosive sulfuric acid.
ItemsParts and tools
Engine oil level (P. 2 7 2 )
• “Toyota Genuine Motor Oil” or
equivalent
• Rag or paper towel, funnel (used
only for adding engine oil)
Fuses (P. 3 0 4 )• Fuse with same amperage rating as
original
Tire inflation pressure (P. 2 9 3 )• Tire pressure gauge
• Compressed air source
Headlight aim (P. 3 1 8 )• Phillips-head screwdriver
Radiator and condenser (P. 2 7 8 )
Wa s h e r f l u i d (P. 2 8 2 )
• Water washer fluid containing anti-
freeze (for winter use)
•Funnel

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4-3. Do-it-yourself maintenance
4
Maintenance and care
Tires
Replace or rotate tires in accordance with maintenance schedules and
tread wear.
■Checking tires
New tread
Tread wear indicator
Worn tread
The location of tread wear indi-
cators is shown by the TWI or 
marks, etc., molded on the side-
wall of each tire.
Check spare tire condition and
pressure if not rotated.
■Tire rotation
2WD models with 16-inch tires and AWD models
Rotate the tires in the order
shown.
Lexus recommends tire rotation
in accordance with the mainte-
nance schedule to equalize tire
wear and extend tire life.
Do not fail to initialize the tire
inflation warning system after
tire rotation.
2WD models with 17-inch tires or 18-inch tires
Tires cannot be rotated.
Front

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4-3. Do-it-yourself maintenance
Directional tires
Tire direction marks
The tires listed below are direc-
tional. The tire sidewalls are
marked with arrows indicating the
rolling direction of the tire. If
mounted on the wrong side of the
vehicle, directional tires will per-
form poorly.
Installing tire inflation pressure sensors
When replacing tires or wheels, tire pressure sensors must also be
installed. Tire pressure sensors can be installed in any of the following
three ways:
■The tire pressure warning system
Your Lexus is equipped with a tire pressure warning system that uses
tire pressure sensors to detect low tire pressure before serious
problems arise. (P. 341, 345)
Before removing the tire from the wheel, remove the system’s tire
inflation pressure sensor. Be careful not to damage the sensor when
removing and installing the tires.
Tire size of turning directional tires
Front225/45R17 90W
225/40R18 88Y
Rear245/45R17 95W
255/40R18 95Y

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4-3. Do-it-yourself maintenance
4
Maintenance and care
●Sensors can be removed from the old wheels and installed on the new
wheels.
●When replacing only the tire, the sensor already installed on the wheel
does not need to be replaced.
●Replacing both a wheel and its sensor.
When new tire pressure sensors are installed, new sensor ID codes must be
registered in the ECU and tire inflation pressure sensor must be initialized.
(P. 285, 286)
Initializing the tire pressure warning system
■The tire pressure warning system must be initialized in the following
circumstances:
●When the standard tire pressure changes by replacing tires or
wheels
●When tires are rotated.
●When tire pressure sensors are replaced.
●When driving with the tires inflated to a higher than standard tire
pressure.
When the tire pressure warning system is initialized, the current tire
pressure is set as the pressure benchmark.
■How to initialize the tire pressure warning system
To initialize the system, use the satellite switch. (P. 222)
Park the vehicle in safe place and turn off the engine.
Adjust the tire pressure to the specified pressure (P. 389)
Start the engine.
Make sure to adjust the tire pressure to the specified level. The tire infla-
tion pressure warning system will operate based on this pressure level.
STEP1
STEP2
STEP3

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4-3. Do-it-yourself maintenance
The tire pressure initialization
setting display
Continue to press the  or 
switch until the initialization setting
display appears.
It may take several minutes to com-
plete the setting. Wait for several
minutes before turning the engine
switch OFF if necessary.
Recording tire pressure settings
Press the ON/OFF button for
more than 3 seconds. At this time,
the tire inflation pressure warning
indicator flashes 3 times and the
message showing that the initial
setting is complete is displayed on
the multi-information display.
Registering and selecting tire inflation pressure sensor ID codes
The tire inflation pressure sensor is equipped with a unique ID code.
To select tire inflation pressure sensor ID codes, use the satellite switch.
(P. 222)
■Registering ID codes
Two separate sets of ID codes can be registered for each vehicle. This
allows 2 separate sets of settings to be conveniently recorded for all
season and winter tires.
MAIN: The MAIN ID code is used for the factory installed tire pres-
sure sensors.
2nd: The 2nd ID code is used for tire inflation pressure sensors associ-
ated with a secondary set of tires.
Make sure to have all tire inflation pressure warning system ID codes regis-
tered by your Lexus dealer. ID codes must be reset when tires or wheels are
replaced.
STEP4

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4-3. Do-it-yourself maintenance
4
Maintenance and care
■Selecting ID codes
When replacing tires, make sure to select the ID code set that matches
the new tire set. If the incorrect ID code is selected, the tire pressure
warning system will not operate properly.
Tire pressure ID code settings
display
Press  or  repeatedly until the
setting display appears.
Switching ID codes
Press the ON/OFF button to
switch between MAIN and 2nd ID
codes.
■When to replace your vehicle’s tires
Tires should be replaced if:
●You have tire damage such as cuts, splits, cracks deep enough to expose the
fabric or bulges indicating internal damage
●A tire goes flat repeatedly or cannot be properly repaired due to the size or
location of a cut or other damage
If you are not sure, consult with your Lexus dealer.
■Tire life
Any tire over 6 years old must be checked by a qualified technician even if they
have seldom or never been used or damage is not obvious.
■If the tread wears down below 0.16 in. (4 mm) on snow tires
The effectiveness of snow tires is lost.
■Low profile tires (models not equipped with 16-inch tires)
Generally, low profile tires will wear more rapidly and tire grip performance will be
reduced on snowy and/or icy roads when compared to standard tires. Be sure to
use snow tires or tire chains
* on snowy and/or icy roads and drive carefully at a
speed appropriate for road and weather conditions.
*: Tire chains cannot be mounted on 18-inch tires.

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4-3. Do-it-yourself maintenance
■Maximum load of tire
Check that the maximum load of the replaced tire is greater than 1 /2 of the Gross
Axle Weight Ratings (GAWR) of either the front axle or the rear axle, whichever is
greater.
As for the maximum load of the tire, see the load limit at maximum cold tire inflation
pressure mentioned on the sidewall of the tire, and as for the Gross Axle Weight
Ratings (GAWR), see the Certification Label. (
P. 2 9 3 , 3 9 8 ) .
■Tire types
1 Summer tires
Summer tires are high-speed performance tires best suited to highway driving
under dry conditions. Since summer tires do not have the same traction perfor-
mance as snow tires, summer tires are inadequate for driving on snow-covered
or icy roads. For driving on snow-covered roads or icy roads, the use of snow tires
is recommended. When installing snow tires, be sure to replace all four tires.
2 All season tires
All season tires are designed to provide better traction in snow and to be ade-
quate for driving in most winter conditions, as well as for use year round. All sea-
son tires, however, do not have adequate traction performance compared with
snow tires in heavy or loose snow. Also, all season tires fall short in acceleration
and handling performance compared with summer tires in highway driving.
3Snow tires
For driving on snow-covered roads or icy roads, we recommend using snow tires.
If you need snow tires, select tires of the same size, construction and load capac-
ity as the originally installed tires. Since your vehicle has radial tires as original
equipment, make sure your snow tires also have radial construction. Do not install
studded tires without first checking local regulations for possible restriction.
Snow tires should be installed on all wheels. (P. 161)
■Initializing the tire inflation pressure warning system
Initialize the tires with the tire inflation pressure adjusted to the specified level.