2006 Lexus GS430 wheel size

STEERING WHEEL AND MIRRORS
209
Automatic tilt away*
G17003
When the engine switch is off, the steering column moves
forward away from the driver and also tilts up for easy exit
and entry.
When you turn on the engine switch, the steering column
returns to the previously set position.
NOTE:
*This feature can be deactivated.
Ask your Lexus dealer for details.
OUTSIDE REAR VIEW MIRRORS
G17004
Adjust the mirror so that you can just see the side of your
vehicle in the mirror.
Be careful when judging the size or distance of any object seen
in the outside rear view mirror on the passenger’s side
because it is a convex mirror. Any object seen in a convex
mirror will look smaller and farther away than if seen in a normal
flat mirror.
When the inside rear view mirror darkens in ”AUTO” mode, the
outside rear view mirrors also darken to reduce the reflection
of the headlights of the following vehicle. For details, see
”Inside rear view mirror” on page 213.
When you push the rear window and outside rear view mirror
defogger switch, the heater panels in the outside rear view
mirrors will quickly clear the mirror surface. (See “Rear window
and outside rear view mirror defogger switch” on page 58.)

STARTING AND DRIVING
427
VEHICLE STABILITY CONTROLSYSTEM
The vehicle stability control system helps provide
comprehensive control of the systems such as antilock
brake system, traction control, engine control, etc. This
system automatically controls the brakes and engine to
help prevent the vehicle from skidding when cornering on
a slippery road surface or operating steering wheel
abruptly.
The vehicle stability control system is activated when the
vehicle speed is about more than 15 km/h (9 mph).
You may hear a sound in the engine compartment for a few
seconds just after the vehicle begins to move. This means that
the system is in the self− check mode, but does not indicate a
malfunction.
CAUTION
 Do not rely excessively on the vehicle stability
control system. Even if the vehicle stability control
system is operating, you must always drive carefully
and attentively to avoid serious injury. Reckless
driving will result in an accident. If the slip indicator
light blinks, sounding an alarm, special care should
be taken while driving.
 Only use tires of specified size. The size,
manufacturer, brand and tread pattern for all 4 tires
should be the same. If you use the tires other than
specified, or different type or size, the vehicle
stability control system may not function correctly.
When replacing the tires or wheels, contact your
Lexus dealer.
 In situations where the road surface is covered with
ice or snow, your vehicle should be fitted with snow
tires or tire chains.

STARTING AND DRIVING
432
Variable gear ratio steering system failure
warning
G31044
If there is any malfunction in the system, the above message
appears and the master warning light comes on.
If the warning message and light come on while driving, the
system is not working. Although conventional steering
operates when maneuvered, a larger degree of wheel
maneuvering (than at the time when the system is functioning
properly) is needed when driving at low speed. At this time, the
center position of the steering wheel could be changed.
Although it is no problem to continue driving, have your vehicle
repaired at your Lexus dealer.
VEHICLE DYNAMICS
INTEGRATED MANAGEMENT (GS430 only)
Vehicle Dynamics Integrated Management (VDIM) helps
manage control for vehicle stability control system,
antilock brake system, brake assist system, traction
control system, engine output control, hillstart assist
control system and also manages variable gear ratio
steering system and electric power steering system.
In order to control sudden steering wheel operation and
the sideslip on slippery road surfaces, this system
provides excellent vehicle stability by automatically
controlling the brake, engine output and front wheel
angle.
The state of the tires will affect the performance of the vehicle
dynamics integrated management system. Be sure to check
the following:
 Are tires of specified size installed?
 Are tires of identical type installed?
 Do the tires have stipulated tire pressure?
 Are the tires worn?
A problem with the tires or modified suspension systems will
have an adverse effect on the system and may cause a
malfunction, so be careful.

STARTING AND DRIVING
436
Install all 4 tires of specified size at appropriate
pressure: The antilock brake system detects vehicle
speeds using the speed sensors for respective wheels’
turning speeds. The use of tires other than specified
may fail to detect the accurate turning speed resulting
in a longer stopping distance.“ABS” warning light
G31080
 1 U.S.A. 2Canada
GS430—The light comes on when the engine switch is
selected in “IG −ON” mode. If the anti −lock brake system and
the brake assist system work properly, the light turns off in a
few seconds after the engine is started.
GS300—The light comes on for a few seconds when the
engine switch is selected in “IG −ON” mode. It indicates the
anti− lock brake system and the brake assist system work
properly.
If either system malfunctions, the light comes on again.
When the “ABS” warning light is on, the anti− lock brake system
and the brake assist system do not operate, but the brake
system still operates conventionally.

STARTING AND DRIVING
446
Replacing tires and wheels
When replacing the tires and wheels, be sure to install tire
pressure warning valves and transmitters. ID codes on the tire
pressure warning valves and transmitters are registered on the
tire pressure warning ECU. When replacing a tire pressure
warning valve and transmitter, it is necessar y to register the ID
code of tire pressure warning valve and transmitter. Have the
ID code registered by your Lexus dealer.
If the ID code is not registered, the system will not work
properly. After about 1 hour, the tire pressure warning light
blinks to indicate a system malfunction.
NOTICE
When the tires or tire pressure warning valves and
transmitters must be replaced, have them replaced by
your Lexus dealer. The tire pressure warning valves
and transmitters will be affected by the installation or
removal of tires.
Tire pressure warning reset switch
G31004a
When initializing the system, the present tire inflation pressure
is stored as standard. The tire pressure warning system
determines decreased air pressure by comparing the present
and the standard tire inflation pressures. When you change
the set tire inflation pressure, it is necessary to initialize the tire
pressure warning system.
 When rotating the tires on vehicles differing with front and
rear tire inflation pressures.
 When changing the tire inflation pressure by changing
traveling speed or load weight, etc.
 When changing the tire size.

CHASSIS
542– STEERING
Free play
Less than 30 mm (1.2 in.)
– TIRES AND WHEELS
Front and rear:
Tire size
245/40R18 93Y or P245/40R18 93V
Tire inflation pressure
Recommended cold tire inflation pressure
Front 230 kPa (2.3 kgf/cm2 or bar, 33 psi)
Rear 230 kPa (2.3 kgf/cm2 or bar, 33 psi)
For sustained high speeds above 160 km/h (100 mph), in
countries where such speeds are permitted by law, add 60 kPa
(0.6 kgf/cm
2 or bar, 9 psi) to the front tires and rear tires, but
never exceed the maximum cold tire inflation pressure molded
on the tire sidewall.
Wheel size18 x 8 JJ
Wheel nut torque103 N·m (10.5 kgf·m, 76 ft·lbf.)

CHASSIS
543
Spare (Vehicles with standard tires only):Tire size
T155/70D17 110M
Tire inflation pressure420 kPa (4.3 kgf/cm2, 4.2 bar, 60 psi)
Wheel size17 x 4T
Wheel nut torque103 N·m (10.5 kgf·m, 76 ft·lbf.)
NOTE:
For complete information on tires (e.g. replacing tires or replacing wh\
eels), see “Checking tire inflation pressure”
through “Aluminum wheel precautions” on page 548 through 570.

CHASSIS
546
– TIRES AND WHEELS
Front and rear:Tire size
225/50R17 94W or P225/50R17 93V
Tire inflation pressure
Recommended cold tire inflation pressure
Front 230 kPa (2.3 kgf/cm2 or bar, 33 psi)
Rear 230 kPa (2.3 kgf/cm2 or bar, 33 psi)
For sustained high speeds above 160 km/h (100 mph), in
countries where such speeds are permitted by law, add 50 kPa
(0.5 kgf/cm
2 or bar, 7 psi) to the front tires and rear tires, but
never exceed the maximum cold tire inflation pressure molded
on the tire sidewall.
Wheel size17 x 7 1/2 JJ
Wheel nut torque103 N·m (10.5 kgf·m, 76 ft·lbf.)
Spare (Vehicles with standard tires only):
Tire size
T155/70D17 110M
Tire inflation pressure420 kPa (4.3 kgf/cm2, 4.2 bar, 60 psi)
Wheel size17 x 4T
Wheel nut torque103 N·m (10.5 kgf·m, 76 ft·lbf.)
NOTE:
For complete information on tires (e.g. replacing tires or replacing wh\
eels), see “Checking tire inflation pressure”
through “Aluminum wheel precautions” on page 548 through 570.