2006 Lexus GS430 Scheduled Maintenance Guide / LEXUS 2006 GS430/GS300 FROM JAN. 2005 PROD. OWNER'S MANUAL (OM30649U)

STARTING AND DRIVING
436Vehicles with standard tires:
Stop your vehicle at a safe place as soon as possible and
check that the tire inflation pressure
is as specified on the tire
and loading information label. If the low tire pressure warning
light comes on even after tire inflation pressure adjustment, it
is probable that you have a flat tire. If the tire goes flat, change
to the spare tire. (See page 469.)
The spare tire is not equipped with the tire pressure sensor.
So, the low tire pressure warning light remains on even if the
spare tire is mounted.
The light goes off a few minutes after air is put into the deflated
tire.
CAUTION
If the low 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.
When the tyre pressure warning system warning light is
lit, one or more of your tyres is significantly
underinflated. You should stop and check your tyres
as soon as possible, and inflate them to the proper
pressure as indicated on the vehicle’s tyre information
placard. Driving on a significantly underinflated tire
causes the tyre to overheat and can lead to tyre failure.
Underinflation also reduces fuel efficiency and tyre
tread life, and may affect the vehicle’s handling and
stopping ability. Each tyre, including the spare, should
be checked monthly when cold and set to the
recommended inflation pressure as specified in the
vehicle placard and owner’s manual.

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437
NOTICE
Do not use liquid sealants for a flat tire as tire
pressure sensors will be damaged.
 When the tires must be repaired or replaced, have
them repaired or replaced by the nearest Lexus
dealer or authorized tire dealer. The tire pressure
sensors will be affected by the installation or removal
of tires.
 When the tires must be replaced, replace the
grommets for tire pressure sensors as well.
System malfunction
G31048
If the low tire pressure warning light blinks and the above
message appears on the multiinformation display, it
indicates a system malfunction. Contact your Lexus
dealer.
The system will be disabled in the conditions below:
Electric devices or facilities using similar radio wave
frequencies are nearby.
 If a radio set at similar frequencies is in use.
 Much snowflakes or ice gets on the vehicle, in particular,
around the wheels or wheel housings.
 Non− genuine Lexus wheels are used.
 Snow tires or tire chains are used.
 The sensor battery is expired.
 The tires not equipped with tire pressure sensor are used.

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438
Although the tires are equipped with tire pressure sensors,
the selector switch (see page 442) is set to other tire setting.
NOTICE
 The use of nongenuine wheels will cause the tire
pressure sensors to transmit the electronic code in
different manner, resulting in the failure of the
system.
 The use of tires other than originally installed with
genuine wheels may also cause the malfunction of
the system.
For vehicles sold in U.S.A.
This device complies with Part 15 of the FCC Rules.
Operation is subject to the following two conditions: (1)
This device may not cause harmful interference, and (2)
this device must accept any interference received,
including interference that may cause undesired
operation.
NOTICE:
This equipment has been tested and found to comply
with the limits for a Class B digital device, pursuant to
Part 15 of the FCC Rules. These limits are designed to
provide reasonable protection against harmful
interference in a residential installation. This equipment
generates, uses and can radiate radio frequency
energy and, if not installed and used in accordance with
the instructions, may cause harmful interference to
radio communications. However, there is no guarantee
that interference will not occur in a particular
installation. If this equipment does cause harmful
interference to radio or television reception, which can
be determined by turning the equipment off and on, the
user is encouraged to try to correct the interference by
one or more of the following measures:
 Reorient or relocate the receiving antenna.
 Increase the separation between the equipment and
receiver.

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439
Connect the equipment into an outlet on a circuit
different from that to which the receiver is connected.
 Consult the dealer or an experienced radio / TV
technician for help.
FCC WARNING:
Changes or modifications not expressly approved
by the party responsible for compliance could void
the user’s authority to operate the equipment.
For vehicles sold in Canada
Operation is subject to the following two conditions: (1)
this device may not cause interference, and (2) this
device must accept any interference, including
interference that may cause undesired operation of the
device.
Replacing tires and wheels
As you might have difficulty in locating a flat or deflated
tire, a tire pressure warning system should be installed on
the tires of this vehicle.
When replacing the wheels, be sure to install tire pressure
sensors on the wheels.
There are 3 ways to set up the tire pressure sensors:
a. Remove the sensor from the old wheel and install it to the
new wheel.
b. Keep the same wheel with tire pressure sensor and replace
the tire alone.
c. Use a new wheel and sensor.
You have to register an ID code for a new sensor. Up to 2
sets of codes can be registered. As one ID for the originally
installed sensor is registered at “MAIN” of the selector
switch, use the “2nd” position to register an ID for the new
sensor.
You do not need to re −register the ID code for any other
replacements. For the use of the originally installed tires,
put the selector switch at “MAIN” and for the use of tires set
purchased later, put the switch at “2nd”. For the sensor
selector switch, see page 442.

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440
NOTICE
Have the tires, wheels or sensors replaced and ID
codes registered by Lexus dealer. If you need
sensors, purchase from Lexus dealer.
 The sensor nuts should always be tightened to a
torque of 4 N·m (0.4 kgf·m, 2.9 ft·lbf).
 The use of nongenuine wheels will cause the tire
pressure sensors to transmit the electronic code in
different manner, resulting in the failure of the
system.
Tire pressure warning system reset switch
G31004
The tire pressure warning system needs to be initialized
in the following conditions:
After replacing or rotating tires or wheels
 After replacing the tire pressure sensor
When initializing the system, the present tire condition is
stored as a standard.

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441
To initialize the system, perform the following:
1. Park
the vehicle at a safe place and apply the parking brake.
Stop the engine.
2. Adjust the pressure of all the installed tires to the specified
level. (See “Tires and wheels” on pages 534 and 537.)
3. Start the engine.
4. Push and hold the reset switch until the low tire pressure
warning light blinks three times, and the message
“PRESSURE INITIAL” appears on the multi− information
display.
Do not turn the engine off for about 20 minutes until
initialization is complete.
G31007
When initializing the system, make sure the low tire pressure
warning light blinks three times and the message “PRESSURE
INITIAL” appears on the multi− information display. If the
warning light does not blink three times and the message does
not appear on the multi−information display, initialization failed
and the tire pressure warning system will not function properly.
In this case, initialize the system again.
Do not push the reset switch without adjusting the tire inflation
pressure to the specified level. Otherwise, the low tire
pressure warning light may not come on even if the tire inflation
pressure is low, or it may come on when the tire inflation
pressure is actually normal.
If you push the reset switch while the vehicle is moving,
initialization is not performed.
If the low tire pressure warning light does not blink and the
message does not appear on the multi−information display
when you push and hold the reset switch, have the tire
pressure warning system checked at your Lexus dealer.

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442
NOTICE
Do not turn the engine switch off during initialization,
or the system may not function properly due to
incomplete initialization.
 Check which tires are being used before initialization
of the system, and also check the selector switch
position. (See the following “Selector switch”.)
Selector switch
G31005
 1 Main position 22nd position
The selector switch is located on the underside of the
glove box.
The ID code is given in the tire pressure sensor. To
activate th e tire pressure warning system, it is necessary
to register the ID code of the sensor on the selector switch
in the vehicle.
2 sets of ID codes can be registered. The code of the tires
originally in stalled on the vehicle is registered on the switch at
“MAIN”. Have a new tires set with new tire pressure sensors
registered at “2nd” by Lexus dealer.
ID codes should be registered by Lexus dealer. Once
registered, change the setting position each time you purchase
tires and wheels. Re −registration is not required.
When purchasing new tires, consult your Lexus dealer.

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CAUTION
When the tires whose ID code is registered at “MAIN”
are used, the system does not work properly with the
selector switch set at “2nd”. If the tires whose ID code
is registered at “2nd” are stored nearby, the system will
detect their tire inflation pressure (and vice versa).
Liquid sealants for flat tires
NOTICE
Do not use liquid sealants for flat tires as the tire
pressure sensors will be damaged.
PRECOLLISION SYSTEM
(Vehicles with dynamic radar cruise control)
When the precollision system detects what it perceives
to be an unavoidable collision, the front seat belts are
quickly drawn back by the retractors (precollision seat
belts) and more powerful braking is applied according to
the amount of pedal depression to help reduce injury to
the occupants and damage to the vehicle body. In
addition, the adaptive variable suspension works to help
regulate the vehicle not to pitch forward so much.
The pre−collision system will operate when the engine switch
is selected in “IG −ON” mode.