tire pressure LEXUS LS430 2006 User Guide

280
4-3. Do-it-yourself maintenance
■When to replace your vehicle’s tires
If either of the following occurs, the tire should be replaced:
• Tire damage such as cuts, splits, cracks deep enough to expose the
fabric, or bulges indicating internal damage
• If a tire often goes flat or cannot be pr
operly repaired due to the size
or location of a cut or other damage
If you are not sure, see your Lexus dealer.
■Tire life
Any tire over 6 years old must be checked by a qualified technician even if it has
ne

ver or seldom 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.
■Tire selection
When replacing a tire, use a tire of the sa me siz
e and construction, and the same or
greater maximum load as the originally installed tires.
Check that the maximum load of the replaced t
ire 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 a
t maximum cold tire inflation
pressure mentioned on the sidewall of the tire. 
As for the Gross Axle Weight Ratings (GAWR), see the Certification Label. 
(  P.283 )

282
4-3. Do-it-yourself maintenance
+
CAUTION
■When inspecting or replacing tires
Observe the following instructions, as failure to do so may cause dangerous han-
dling characteristics resulting in loss of contr
ol and could cause death or serious
injury.
• Do not mix radial, bias belted, or bias-ply tir
es on your vehicle, or use tires other
than the manufacturer’s recommended size.
• Do not mix summer and all season tires on your vehicle.
• Do not use tires other than the manufact ur
er’s designated tires, and never mix
tires or wheels of different size to the originals.
NOTICE
■To prevent malfunction of the tire pressure warning system
Do not push the reset switch without adjusting the tire inflation pressure to the spec-
ified level. Otherwise, the low tire pressure warning may not function correctly.
(  P.334 )
■If tire pressure becomes low while driving
Do not continue driving, your ti r
es and/or wheels may be ruined.

283
4-3. Do-it-yourself maintenance
4
Maintenance and care
Tire inflation pressure
■Tire inflation pressure
The recommended cold tire inflation pressure and tire size is displayed on the
tire and loading information label.
Recommended cold tire inflation pressure
Ti r e s i z eInflation pressure psi (kPa, kgf/cm2 or bar)
P225/55R17 95HFront32 (220, 2.2)
Rear32 (220, 2.2)
245/45R18 96WFront33 (230, 2.3)
Rear33 (230, 2.3)
P245/45R18 96VFront33 (230, 2.3)
Rear33 (230, 2.3)

284
4-3. Do-it-yourself maintenance
For sustained high speeds above 100 mph (160 km/h), in countries where such
speeds are permitted by law, add the below pressure to the front tires and rear
tires, but never exceed the maximum cold tire inflation pressure molded on the
tire sidewall.
• P225/55R17 95H: 3 psi (20 kPa, 0.2 kgf/cm2 or bar)
• 245/45R18 96W: 6 psi (40 kPa, 0.4 kgf/cm2 or bar)
• P245/45R18 96V: 6 psi (40 kPa, 0.4 kgf/cm2 or bar)
■ Inspection and adjustment procedure
Ti r e v a l v e
Tire pressure gauge
Remove the tire valve cap.
Press the tip of the tire pressure gauge to the tire valve.
Read the pressure using the graduations on the gauge.
If the tire inflation pressure is not within r
ecommended levels,
inflate the tire.
If you add too much air, press the center of the valve to lower.
After completing the tire inflation pressure measurement and
adjustment, apply soapy water to the v
alve and check for leakage.
Reinstall the tire valve cap.
1
2

285
4-3. Do-it-yourself maintenance
4
Maintenance and care
■Tire inflation pressure check interval
You should check the tire inflation pressur
e every two weeks, or at least once a
month. 
Do not forget the spare. The inflation pressure for the spare tire should be the same
as
that for the standard tire. ( P.364 )
■Effects of incorrect tire inflation pressure
Driving with incorrect tire inflation pressure may result in the following:
•Wasting fuel
• Reducing driving comfort and tire life
• Making your vehicle less safe to drive
If a tire needs frequent refilling, have it checked by your Lexus dealer.
■Instructions for checking tire inflation pressure
When checking tire inflation pressure, observing the following;
• Check only when the tires are cold. 
If your vehicle has been parked for at least 3 hours and has not been driven for
mor
e than 1 mile or 1.5 km since, you will get an accurate cold tire inflation pres -
sure reading.
• Always use a tire pressure gauge. 
The appearance of the tire can be misleadi n
g. In addition, tire inflation pressures
that are even just a few pounds off can degrade ride and handling.
• Do not bleed or reduce tire inflation pressure after driving. 
It is normal for the tire inflation pressure to be higher after driving.
• Never exceed the vehicle weight capacity. 
Passengers and luggage weight should be pla
ced so that the vehicle is bal-
anced.

286
4-3. Do-it-yourself maintenance
CAUTION
■When inspecting and adjusting tire pressure
Be sure to reinstall the tire valve caps. 
Without the valve caps, dirt or moisture c
ould get into the valve and cause air leak-
age, which could result in an accident. If the caps ha
ve been lost, have new ones put
on as soon as possible.
■Check tire pressure regularly
The tire pressure warning system will warn you when one or more of your tires are
si
gnificantly under-inflated. However, ther e are combinations which the system will
not detect (both tires on the same side or same axle). Thus it is important to check
the tire pressure of all tires regularly.
■Proper inflation is critical to safe tire performance
Keep your tires properly inflated. Otherwise, the following conditions may occur
and r

esult in an accident causi ng in death or serious injury.
•Excessive wear
• Uneven wear
• Poor handling
• Possibility of blowouts from an overheated tire
• Poor sealing of the tire bead
• Wheel deformation and/or tire separation
• A greater possibility of tire damage from road hazards

5
When trouble arises
335
5-2. Steps to take in an emergency
Have the vehicle inspected by your Lexus dealer immediately.
Failing to investigate the cause of the following warnings may lead to the
system operating abnormally and possibly cause an accident.
Have the vehicle inspected by your Lexus dealer immediately.
Warning message and
lightDetails
(flashes)
Brake wear warning
Indicates that your brake pads have worn down
enough to require replacement.
and
VSC and TRAC warning
Indicates a malfunction in the vehicle stability
control system or the traction control system.
These systems do not work while the warning
message is displayed, however, it is no problem
to continue normal driving.
Tire pressure warning system failure warning
Indicates a malfunction in the tire pressure
w
arning system. The system does not work
while the warning message is displayed, how -
ever, it is no problem to continue normal driving.
(flashes)
Steering lock cable failure warning
Indicates that the interlock cable for the steer -
ing lock is faulty.

338
5-2. Steps to take in an emergency
Warning message and lightDetailsCorrection procedures
(flashes)
Open moon roof warn-
ing
If the driver's door is
opened with the igni-
tion switch turned off
and the moon roof is
opened.
Close the moon roof
when you leave your
vehicle.
Parking brake warning
(Warning buzzer)*1
Indicates that the
parking brake is not
released.Release the parking
brake.
Low tire pressure
warning
Tire inflation pressure
is low.Adjust the tire inflation to
the specified pressure.
Low washer fluid warn -
ing
Washer fluid level is
low.Fill the washer fluid tank.
Air conditioning filter
warning
Indicates that the air
conditioning filter is
clogged enough to
require replacement.Change the air condi-
tioning filter.

342
5-2. Steps to take in an emergency
■Resetting the tire pressure warning data
After adjusting the tire inflation pressur
e, be sure to initialize the data. (P. 2 7 9 )
If the message remains on, the system may have malfunctioned. Have the vehicle
inspected b
y your Lexus dealer as soon as possible
■The tire pressure warning system may not function properly in the following con -
ditions
●Tires other than the sp ecified sizes are used, or if tires of different sizes or tread
pattern are mixed, or the degree of tread wear is very different among the
installed tires.
●A compact spare tire, snow tires, or tire chains are used.
●The tire inflation pressure is excessively higher than specified, or tire inflation
pressure suddenly drops due to buresting or other causes.
●Driving on slippery road surfaces such as rough or frozen roads.
●Driving under 19 mph (30 km/h) or above 62 mph (100 km/h), or less than 5
minutes drive.
●Initialization was not performed correctly after replacing or rotating tires or
wheels.
●The outside temperature is below 32 °F (0 °C) or above 104 °F(40 °C).
CAUTION
■When the low tire pressure warning message appears
Avoid abrupt maneuvering and braking. If th
e vehicle’s tires have deteriorated, you
could lose control of the vehicle, resulting in death or serious injury.

370
6-1. Specifications
Tires and wheels (Type A)
Tires and wheels (Type B)
Ti r e s i z eP225/55R17 95H
Tire inflation pressure
(Recommended cold 
tire inflation pressure)
Driving in normal conditions
32 psi (220 kPa, 2.2 kgf/cm2 or bar)
Driving in high speeds above 100 mph (160
km/
h) 
(in countries where such speeds are permitted
b

y 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
molded on the tire sidewall.
Wheel size17  7 1 /2 JJ
Wheel nut torque76 f t•lbf. (103 N•m, 10.5 kgf•m)
Ti r e s i z e245/45R18 96W
Tire inflation pressure
(Recommended cold 
tire inflation pressure)
Driving in normal conditions
33 psi (230 kPa, 2.3 kgf/cm2 or bar)
Driving in high speeds above 100 mph (160
km/
h) 
(in countries where such speeds are permitted
b
y law)
Add 6 psi (40 kPa, 0.4 kgf/cm
2 or bar) to
the front tires and rear tires. Never exceed
the maximum cold tire inflation pressure
molded on the tire sidewall.
Wheel size18  7 1 /2 JJ
Wheel nut torque76 f t•lbf. (103 N•m, 10.5 kgf•m)