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

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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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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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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.

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Precollision sensor
The millimeter wave radar sensor detects vehicles or
objects near or on the road your vehicle is traveling and
determines the possibility of a collision based on the
object position, vehicle speeds and the course you are
traveling.
The pre− collision sensor will operate when the vehicle speed
is about 5 km/h (3 mph) or over.
G31019
 1 Millimeter wave grille cover
2Millimeter wave radar sensor
The millimeter wave radar sensor is installed in the front grille
of the hood.
The millimeter wave radar sensor cannot detect plastic objects
such as pylons, and may not detect people, animals, bicycles,
motor cycles, trees, snowbanks, etc. as objects with which
your vehicle may collide.
CAUTION
To ensure that precollision system will function
properly while driving, observe the following. Failure to
follow these instructions could reduce the
effectiveness of the precollision system in case of
vehicle accident:
 Always keep the millimeter wave radar sensor and
grille cover clean. When cleaning, use a soft cloth
and be careful not to damage the sensor and grille
cover.
 Avoid strong impacts around the millimeter wave
radar sensor. An incorrect millimeter wave radar
sensor alignment will result in system malfunction.
A special device is required to adjust the millimeter
wave radar sensor alignment. Be sure to have the
sensor adjusted by your Lexus dealer.
 Do not disassemble the millimeter wave radar
sensor.
 Do not affix a sticker (including a transparent sticker)
or attach an accessory around the millimeter radar
sensor or the grille cover.
 Do not modify or paint the grille cover. When
replacing the grille cover, be sure to use a genuine
grille cover.

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Precollision seat belts (Front seat belts only)
When the precollision sensor detects an object or
vehicle with which your vehicle might collide and
determines that a collision may be unavoidable, the seat
belts are quickly drawn back by the retractors to enhance
the effects of the seat belt pretensioners. The
precollision seat belts also work as well when hard
braking.
The pre −collision seat belts will operate in the following
conditions:
 When the approaching speed in regard to the object or the
vehicle exceeds about 30 km/h (18 mph).
 When the front seat occupants wear the seat belts.
In the following conditions, the seat belts are quickly drawn
back by the retractors regardless of the possibility of the
collision:
 When the vehicle speed is about 14 km/h (9 mph) or over.
 When the vehicle is spinning or cannot take a turn properly.
Precollision brake assist system
When the precollision sensor detects an object or
vehicle with which your vehicle might collide, and
determines that a collision may be unavoidable,
depressing the brake pedal provides more powerful
braking according to the amount of pedal depression.
The pre −collision brake assist system will operate in the
following conditions:
 When the vehicle speed is about 30 km/h (18 mph) or over.
 When the brake pedal is depressed.
 When the approaching speed in regard to the object or the
vehicle exceeds about 30 km/h (18 mph).
If the brake pedal is kept depressed before the sensor’s
determination of unavoidable collision, the pre −collision brake
assist system will operate soon after the sensor’s
determination.

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Adaptive variable suspension control (GS430
only)
When the precollision sensor detects an object or
vehicle with which your vehicle may collide, and
determines that a collision may be unavoidable, the
adaptive variable suspension adjusts the damping effect
on the shock absorbers and regulates the vehicle not to
pitch forward so much.
The adaptive variable suspension will operate in the following
conditions:
When the vehicle speed is about 5 km/h (3 mph) or over.
 When the approaching speed in regard to the object or the
vehicle exceeds about 30 km/h (18 mph).
Precollision system failure warning
G31079
Precollision system warning light
The light warns that there is a problem somewhere in the
precollision system.
The light comes on when the engine switch is selected in
“IG−ON” mode. If the system works properly, the light goes off
after a few seconds.
If the light does not come on when the engine switch is selected
in “IG−ON” mode, have your vehicle checked by your Lexus
dealer.
If the system has a problem, the pre− collision system warning
light comes on or blinks. At this time, the master warning light
comes on, a warning tone sounds, and either of the following
messages appears on the multi−information display.
 PCS DISABLED NOW
 CHECK PCS

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G13030
The precollision system warning light blinks, and the
above message appears in the following conditions:
The millimeter wave radar sensor or the grille cover is
dirty.
Clean the grille or sensor with a soft cloth to remove the dirt.
 The precollision seat belts are activated repeatedly for
a short time.
The system turns of f temporarily for overheating protection.
The above conditions do not indicate a malfunction. If the
problem is removed, the warning lights and message go out
and the system returns to normal.
G13031
If the pre−collision system warning light remains on, and the above message appears, the pre −collision system may not
operate. Contact your Lexus dealer as soon as possible to
service the vehicle.
Precaution for precollision system
It should be noted that the pre −collision sensor may detect the
following as the objects with which your vehicle might collide,
and the pre −collision system may operate, even though there
is no possibility of collision.
 When traveling through a curve, there is an object on the
edge of the road.
 When traveling through a curve, another vehicle is passing
from the opposite direction.
 When traveling across a narrow iron bridge.
 When there is a metallic object on the road.
 When there is a steel plate on the road at a construction site.
 When there is a bump on the road.
 When waiting to turn to the left in an intersection, and
another vehicle is passing from the opposite direction.
 If your vehicle approaches another vehicle ahead very
quickly.

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CAUTION
Do not rely solely on the precollision system to
avoid accidents. Your safe and attentive driving
practices are still the best way to avoid accidents and
you are always responsible for the operation of the
vehicle and the safety of your passengers. When
driving, always pay attention to the surrounding
conditions and the course you are driving.
 The precollision sensor’s collision detection
performance is limited. The sensor is able to detect
a forward object within 10 degrees on either left or
right side. If it is out of the range, or if there is no or
weak millimeter wave reflection, the sensor could not
detect the object and the system does not work
properly.
 Even if the precollision system is operative in an
unavoidable collision, unless the seat belts are worn
and the brake pedal is depressed, the precollision
seat belts and precollision brake assist system will
not work.
NOTICE
Even if there is no object with which your vehicle may
collide, the precollision system may be activated as
follows:
 The precollision seat belts work to quickly draw
back the front seat belts by the retractors
(precollision seat belts).
 The precollision brake assist system works to apply
more powerful braking than normal braking.

SECTION 3 – 2
449
STARTING AND DRIVING
Driving tips
Break−in period450
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Operation in foreign countries 450
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Tips for driving in various conditions 450
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Winter driving tips 452
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Dinghy towing 453
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Trailer towing 454
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How to save fuel and make your vehicle
last longer 454
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Vehicle load limits 456
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Cargo and luggage 457
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