2006 Lexus GS430 warning

IN CASE OF AN EMERGENCY
475
CAUTION
If the tire pressure warning light comes on, take
your vehicle to the nearest Lexus dealer or
authorized tire dealer as soon as possible,
observing the following instructions:
Decelerate as soon as possible to the most
appropriate speed that conditions permit. Do
not drive for longer than 160 km (100 miles) or
over 90 km/h (55 mph).
 Avoid abrupt steering wheel maneuvering and
braking. If the vehicle tires deteriorate, you
could lose control of the steering wheel or the
brakes, causing death or serious injury.
 The warning system may not activate
immediately if bursts or sudden air leakage
should occur.
NOTICE
Do not use liquid sealants for a flat tire as tire
pressure warning valves and transmitters will
be damaged.
 Take due care not to go over a curb stone and
be careful of the holes in the road because
deflated tire pressure affects tire cushion
performance. The wheels, tires, body,
suspension and other components could be
damaged.
 Your ground clearance is reduced if the runflat
tire goes flat so avoid driving over obstacles
and drive slowly on rough, unpaved roads and
speed bumps. Also, do not attempt to go
through an automatic car wash as the vehicle
may get caught, resulting in damage.
 When the tires must be repaired and replaced,
have them repaired and replaced by your Lexus
dealer or an authorized tire dealer. The tire
pressure warning valves and transmitters will
be affected by the installation or removal of
tires.
 When the tires must be replaced, replace the
grommets for tire pressure warning valves and
transmitters as well.

IN CASE OF AN EMERGENCY
476
IF YOU HAVE A FLAT TIRE
(Vehicles with standard tires)
CAUTION
If the tire pressure warning light comes on,
observe the following instructions:
 Decelerate as soon as possible to the most
appropriate speed that conditions permit.
 Avoid abrupt steering wheel maneuvering and
braking. If the vehicle tires deteriorate, you
could lose control of the steering wheel or the
brakes, causing death or serious injury.
 The warning system may not activate
immediately if bursts or sudden air leakage
should occur.
1. Reduce your speed gradually, keeping a straight line.
Move cautiously off the road to a safe place − well away
from the traffic. Avoid stopping on the center divider of
a highway. Park on a level spot with firm ground.
2. Stop the engine and turn on your emergency flashers.
3. Firmly set the parking brake and put the transmission
in ”P”.
4. Have everyone get out of the vehicle on the side away
from traffic. 5. Read the following instructions thoroughly.
CAUTION
When jacking, be
sure to observe the following to
reduce the possibility of personal injury:
 Follow jacking instructions.
 Do not put any part of your body under a vehicle
supported by a jack. Otherwise, personal injury
may occur.
 Do not start or run the engine while your vehicle
is supported by the jack.
 Stop the vehicle on a level firm ground, firmly
set the parking brake and put the transmission
in ”P”. Block the wheel diagonally opposite to
the one being changed if necessary.
 Make sure to set the jack properly in the jack
point. Raising the vehicle with jack improperly
positioned will damage the vehicle or may allow
the vehicle to fall off the jack and cause
personal injury.
 Never get under the vehicle when the vehicle is
supported by the jack alone.

IN CASE OF AN EMERGENCY
477
Use the jack only for lifting your vehicle during
wheel changing.
 Do not raise the vehicle with someone in the
vehicle.
 When raising the vehicle, do not put an object
on or under the jack.
 Raise the vehicle only high enough to remove
and change the tire.
NOTICE
Do not use liquid sealants for a flat tire as tire
pressure sensors will be damaged.
 Do not continue driving with a deflated tire.
Driving even a short distance can damage a tire
beyond repair.
 When the tires must be repaired and replaced,
have them repaired and replaced by your Lexus
dealer or an authorized tire dealer. The tire
pressure warning valves and transmitters will
be affected by the installation or removal of
tires.
 When the tires must be replaced, replace the
grommets for tire pressure warning vales and
transmitters as well.
Compact spare tire
G40025
The compact spare tire is designed for temporary
emergency use only.
The compact spare tire is identified by the distinctive
wording “TEMPORARY USE ONLY” molded into the
side wall of the tire.
To keep the compact spare tire noticeable, do not hide
the wheel by a wheel cover or such.
The compact spare tire saves space in your luggage
compartment, and its lighter weight helps to improve fuel
economy and permits easier installation in case of a flat
tire.

IN CASE OF AN EMERGENCY
478
The compact spare tire is not equipped with the tire
pressure warning valve and transmitter. If a tire goes
flat, the warning light will not turn off even though the flat
tire is replaced with the spare tire. Replace the spare tire
with the repaired tire and adjust the proper tire inflation
pressure. The tire pressure warning light will turn off
after a few minutes.
The compact spare tire can be used many times, if
necessary. It has tread life of up to 4800 km (3000 miles)
depending on road conditions and your driving habits.
When tread wear indicators appear on the tire, replace
the tire. (See “Checking and replacing tires” on page
563.)CAUTION
 The compact spare tire was designed especially
for your Lexus. Do not use it on any other
vehicle.
 Do not use more than one compact spare tire at
the same time.
 The pressure for the compact spare tire must be
420 kPa (4.3 kgf/cm
2, 4.2 bar, 60 psi).
 Do not exceed 80 km/h (50 mph) when driving
with the compact spare tire.
 Replace the compact spare tire with the
standard tire as soon as possible.
 Avoid sudden acceleration, sudden
deceleration and sharp turns with the compact
spare tire.

MAINTENANCE
502Battery
Your Lexus has a maintenance free battery. You do not have
to add distilled water. For longer life of the battery, however,
see page 581 for additional information.
Brake fluid level
Make sure the brake fluid level is correct. See page 547 for
additional information.
Engine oil level
Check the level on the dipstick with the engine turned off and
the vehicle parked on a level spot.
See page 530 for additional
information.
Exhaust system
If you notice any change in the sound of the exhaust or smell
exhaust fumes, have the cause located and corrected
immediately. (See “Engine exhaust caution” on page 347.)
Vehicle interior
Items listed below should be checked regularly, e.g. while
performing periodic services, cleaning the vehicle, etc.
Lights
Make sure the headlight, stop lights, tail lights, turn signal
lights, and other lights are working. Check headlight aim.
Service reminder indicators and warning buzzers
Check that all service reminder indicators and warning
buzzers function properly.
Steering wheel
Check that it ha s the specified free play. Be alert for changes
in steering condition, such as hard steering, excessive free
play or strange noise.
Seats
Check that all front seat controls such as seat adjusters,
seatback recliner, etc. operate smoothly. Check that the head
restraints move up and down smoothly and that the locks hold
securely in any latched position.
Seat belts
Check that the seat belt system such as buckles, retractors
and anchors operate properly and smoothly. Make sure the
belt webbing is not cut, frayed, worn or damaged.

CHASSIS
547
CHECKING BRAKE FLUID
G62010
GS430
G62011
GS300
To check the fluid level, simply look at the seethrough
reservoir. The level should be between the ”MAX” and
”MIN” lines on the tank. It is normal for the brake fluid level to go down slightly as the
brake pads wear or when the fluid level in the accumulator is
high.
If the level is low, take your vehicle to a Lexus dealer as
soon as possible. Do not drive your vehicle if the brake
system warning light (red) is on. Call a Lexus dealer for
assistance.
If the fluid level goes down soon after your vehicle is
serviced, it may indicate a serious mechanical problem.
Have your vehicle checked by your Lexus dealer.
CAUTION
Brake
fluid can harm your hands or eyes. If fluid gets on
your hands or in your eyes, flush the affected area with
clean water immediately. If you still feel uncomfortable
with your hands or eyes, go to the doctor.
NOTICE
If brake fluid is spilled on the vehicle, be sure to wipe it
off to prevent damage to parts or paint.

CHASSIS
557
Uniform tire quality grading
This information has been prepared in accordance
with regulations issued by the National Highway
Traffic Safety Administration of the U.S. Department
of Transportation. It provides the purchasers and/or
prospective purchasers of Lexus vehicles with
information on uniform tire quality grading.
Your Lexus dealer will help answer any questions
you may have as you read this information.
DOT quality grades All passenger vehicle tires
must conform to Federal Safety Requirements in
addition to these grades. Quality grades can be
found where applicable on the tire sidewall between
tread shoulder and maximum section width. For
example: Treadwear 200 Traction AA Temperature
A
Treadwear − The treadwear grade is a comparative
rating based on the wear rate of the tire when tested
under controlled conditions on a specified government
test course. For example, a tire graded 150 would wear
one and a half (1 − 1/2) times as well on the government
course as a tire graded 100. The relative performance
of tires depends upon the actual conditions of their use,
however, and may depart significantly from the norm
due to variations in driving habits, service practices and
differences in road characteristics and climate. Traction
AA, A, B, C − The traction grades, from highest
to lowest, are AA, A, B and C, and they represent the
tire’s ability to stop on wet pavement as measured under
controlled conditions on specified government test
surfaces of asphalt and concrete. A tire marked C may
have poor traction performance.
Warning: The traction grade assigned to this tire is
based on braking (straight ahead) traction tests and
does not include cornering (turning) traction.
Temperature A, B, C − The temperature grades are A
(the highest), B, and C, representing the tire’ s resistance
to the generation of heat and its ability to dissipate heat
when tested under controlled conditions on a specified
indoor laboratory test wheel. Sustained high
temperature can cause the material of the tire to
degenerate and reduce tire life, and excessive
temperature can lead to sudden tire failure. The grade
C corresponds to a level of performance which all
passenger car tires must meet under the Federal Motor
Vehicle Safety Standard No. 109. Grades B and A
represent higher levels of performance on the laboratory
test wheel than the minimum required by law.
Warning: The temperature grades for this tire are
established for a tire that 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.

CHASSIS
561
RUNFLAT TIRES
This vehicle can be equipped with either runflat
tires (RFT) or standard tires. You may continue
driving on the vehicle with runflat tires even if any
tire goes flat. It may be able to run for a maximum
of 160 km (100 miles) at a speed below 90 km/h (55
mph) after the tire pressure warning light comes on.
When you drive your vehicle after the tire pressure
warning light comes on, the tire must be replaced.
Do not use the repaired tire.
G63004
A “RFT” or “DSST” mark is molded on the sidewall of the
run−flat tire.
If you cannot distinguish between the standard tire and
run−flat tire, consult Lexus dealer.
If you have a flat tire, you have to take a different action
depending on whether the tires are standard tires or
run−flat tires.
Runflat tires characteristics:
The vehicle with run −flat tires helps you to continue
driving for up to 160 km (100 miles) at the moderate
speed and do not ever exceed 90 km/h (55 mph) even
with a flat tire. After such usage, the tire must be
replaced. If you are not sure, consult your Lexus dealer.
If you have a flat tire, decrease the speed and drive at
lower speed to reduce the extent to which the tire is
damaged.
However, in some conditions (such as at high
temperatures), you could not continue driving for up to
160 km (100 miles).
The use of non−genuine wheels may prohibit optimum
performance.
The run −flat tires equipped on this vehicle are ones
dedicated for GS430/300. Do not use them on another
model.
Do not mix run− flat tires with standard tires.
The tire warranty book covers the detailed information
on run− flat tires. For details, see the tire warranty book.
Tire pressure warning system
The tire pressure warning system is equipped to warn
you of the low tire inflation pressure. For details, see
“Tire pressure warning system” on page 440.