2010 Lexus HS250h tire pressure

246
2-5. Driving information
CAUTION
■Driving with snow tires
Observe the following precautions to reduce the risk of accidents. 
Failure to do so may result in a loss of vehicle control and cause death or serious
injury.
●Use tires of the size specified.
●Maintain the recommended level of air pressure.
●Do not drive in excess of 75 mph (120 km/h ), regardless of the type of snow tires
being used.
●Use snow tires on all, not just some wheels.
■Driving with tire chains
Observe the following precautions to reduce the risk of accidents. 
Failure to do so may result in the vehicle being unable to be driven safely, and may
cause death or serious injury.
●Do not drive in excess of the speed limit specified for the tire chains being used,
or 30 mph (50 km/h), whichever is lower.
●Avoid driving on bumpy road surfaces or over potholes.
●Avoid sudden turns and braking, as use of chains may adversely affect vehicle
handling.
●Slow down sufficiently before entering a curve to ensure that vehicle control is
maintained.
NOTICE
■Repairing or replacing snow tires
Request repairs or replacement of snow tire s from Lexus dealers or legitimate tire
retailers. 
This is because the removal and attachment of snow tires affects the operation of
the tire pressure warning valves and transmitters.
■Fitting tire chains
The tire pressure warning valves and transmitters may not function correctly when
tire chains are fitted.

Maintenance and care4
401
4-1. Maintenance and careCleaning and protecting 
the vehicle exterior............ 402
Cleaning and protecting 
the vehicle interior .............. 406
4-2. Maintenance Maintenance 
requirements ........................ 409
General maintenance ............ 411
Emission inspection and 
maintenance (I/M) 
programs................................. 415 4-3. Do-it-yourself maintenance
Do-it-yourself service 
precautions ............................ 416
Hood ........................................... 419
Positioning a floor jack ......... 420
Engine compartment ........... 422
12-volt battery ........................ 433
Tires............................................ 437
Tire inflation pressure........... 445
Wheels ...................................... 448
Air conditioning filter ........... 450
Electronic key battery.......... 453
Checking and replacing 
fuses ........................................ 455
Headlight aim 
(LED headlights) .................. 467
Light bulbs ................................ 469

414
4-2. Maintenance
Vehicle exterior
ItemsCheck points
Doors/trunk• Do the doors and trunk operate smoothly?
Engine hood• Does the engine hood lock system work properly?
Fluid leaks
• There should not be any signs of fluid leakage after the vehicle has
been parked.
Ti r e s
• Is the tire inflation pressure cor-
rect?
• The tires should not be damaged or excessively worn.
• Have the tires been rotated according to the maintenance
schedule?
• The wheel nuts should not be loose.
CAUTION
■If the hybrid system is operating
Turn the hybrid system off and ensure that there is adequate ventilation before per-
forming maintenance checks.

417
4-3. Do-it-yourself maintenance
4
Maintenance and care
ItemsPa r t s a n d t o o l s
Engine oil level (P. 4 2 4 )
• “Toyota Genuine Motor Oil” or
equivalent
•Rag or paper towel
• Funnel (used only for adding engine oil)
Fuses ( P. 4 5 5 )• Fuse with same amperage rating as
original
Headlight aim ( P. 4 6 7 )• Phillips-head screwdriver
Light bulbs( P. 4 6 9 )
• Bulb with same number and watt-
age rating as original
• Phillips-head screwdriver
•Flathead screwdriver
•Wrench
Radiator and condenser (P. 4 3 0 )
Tire inflation pressure ( P. 4 4 5 )• Tire pressure gauge
• Compressed air source
Wa s h e r f l u i d ( P. 4 3 2 )
• Water or washer fluid containing
antifreeze (for winter use)
• Funnel (used only for adding water or washer fluid)

437
4-3. Do-it-yourself maintenance
4
Maintenance and care
Tires
Replace or rotate tires in accordance with maintenance schedules and
treadwear.
■Checking tires
New tread
Treadwear indicator
Worn tread
The location of treadwear indi-
cators is shown by the “TWI” or
“ ”

marks, etc., molded on the
sidewall of each tire.
Check spare tire condition and
pr
essure if not rotated.
■ Tire rotation
Rotate the tires in the order
sho
wn.
To equalize tire wear and extend
tire life, Lexus recommends that
tire rotation is carried out at the
same interval as tire inspection.
P225/45R18 91W tires: 
Do not fail to initialize the tire
pr
essure warning system after
tire rotation.
■ Tire pressure warning system
Your vehicle is equipped with a ti r
e pressure warning system that
uses tire pressure warning valves and transmitters to detect low tire
inflation pressure before serious problems arise. ( P. 4 9 5 , 504 ,
505)
Front

438
4-3. Do-it-yourself maintenance
Installing tire pressure warning valves and transmitters
When replacing tires or wheels, tire pressure warning valves and trans-
mitters must also be installed.
When new tire pressure warning va lv
es and transmitters are installed,
new ID codes must be registered in the tire pressure warning computer
and the tire pressure warning system must be initialized. Have tire pres-
sure warning valve and transmitter ID codes r
egistered by your Lexus
dealer. ( P. 4 3 9 )
Initializing the tire pressure warning system
■The tire pressure warning system must be initialized in the following
circumstances:
● V
ehicles with P225/45R18 91W tires: When rotating front and rear
tires which have different tire inflation pressures
● When changing the tir
e size
When the tire pressure warning sys tem is initializ
ed, the current tire
inflation pressure is set as the benchmark pressure.

439
4-3. Do-it-yourself maintenance
4
Maintenance and care
■How to initialize the tire pressure warning system
Park the vehicle in a safe place and turn the “POWER” switch off.
Initialization cannot be performed while the vehicle is moving.
Adjust the tire inflation pressure to the specified cold tire inflation
pressure level. ( P. 555 )
Make sure to adjust the tire pressure to the specified cold tire inflation
pressure level. The tire pressure warning system will operate based on
this pressure level.
Turn the “POWER” switch to ON mode.
Press and hold the tire pressure warning reset switch until the tire
pressure warning light flashes slo
wly 3 times and the message
“TIRE PRESSURE RESET PROC EEDING” appears on the
multi-information display.
Wait for a few minutes with th e “P
OWER” switch in ON mode
and then turn the “POWER” switch off.
Registering ID codes
The tire pressure warning valve and transmitter is equipped with a unique
ID code. When replacing a tire pressure warning valve and transmitter, it
is necessary to register the ID code. Ha ve the ID code registered by your
Lexus dealer.

440
4-3. Do-it-yourself maintenance
■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, and 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.
■Replacing tires and wheels
If the ID code of the tire pressure warning valve and transmitter is not registered,
the tir
e pressure warning system will not work properly. After driving for about 20
minutes, the tire pressure warning light flas hes for 1 minute and stays on to indicate a
system malfunction.
■Tire life
Any tire over 6 years old must be checked by a
qualified technician even if it has sel-
dom or never been used or damage is not obvious.
■Routine tire inflation pressure checks
The tire pressure warning system does not replace routine tire inflation pressure
ch
ecks. Make sure to check tire inflation pressure as part of your routine of daily
vehicle checks.
■Low profile tires (vehicles with P225/45R18 91W tires)
Generally, low profile tires will wear more rapidly and tire grip performance will be
r
educed on snowy and/or icy roads when co mpared 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.