sensor Lexus GS430 2006 Scheduled Maintenance Guide / LEXUS 2006 GS430/GS300 FROM JAN. 2005 PROD. (OM30649U) Repair Manual

STARTING AND DRIVING
448
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.

IN CASE OF AN EMERGENCY
469
NOTICE
Do not use liquid sealants for a flat tire as tire
pressure sensors 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 replaced, have them
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.
IF YOU HAVE A FLAT TIRE
(Vehicles with standard tires)
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.
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.

IN CASE OF AN EMERGENCY
470
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.
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 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.

IN CASE OF AN EMERGENCY
471
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. The compact spare tire is not equipped with the tire
pressure sensor
. If tire inflation pressure becomes low,
the tire pressure warning system will not be activated.
Also, if you replace the compact spare tire after the low
tire pressure warning light comes on, the light remains
on.
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
554.)

CHASSIS
556
The effectiveness of snow tires is lost if the tread
wears down below 4 mm (0.16 in.).
If you have tire damage such as cuts, splits, cracks
deep enough to expose the fabric, or bulges
indicating internal damage, the tire should be
replaced.
If a tire often goes flat or cannot be properly repaired due
to the size or location of a cut or other damage, it should
be replaced. If you are not sure, consult with your Lexus
dealer.
If air loss occurs while driving, do not continue driving.
Driving even a short distance can damage a tire beyond
repair.
Any tires which are over 6 years old must be
checked by a qualified technician even if damage is
not obvious.
Tires deteriorate with age even if they have never or
seldom been used.
This applies also to the spare tire and tires stored for
future use.NOTICE
 When you purchase new tires, consult your
Lexus dealer. If you change from runflat tires
to standard tires, a spare tire should also be
equipped.
 When the tires must be repaired or replaced,
have them repaired or replaced by Lexus dealer
or authorized 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.

CHASSIS
559
Chain installation
Install the chains on the rear tires as tightly as possible.
Do not use tire chains on the front tires. Retighten chains
after driving 0.5 1.0 km (1/4 1/2 mile).
When installing chains on your tires, carefully follow the
instructions of the chain manufacturer.
CAUTION
Do not exceed 50 km/h (30 mph) or the chain
manufacturer’s recommended speed limit,
whichever is lower.
 Drive carefully avoiding bumps, holes, and sharp
turns, which may cause the vehicle to bounce.
 Avoid sharp turns or lockedwheel braking, as use of
chains may adversely affect vehicle handling.
 When driving with chains installed, be sure to drive
carefully. Slow down before entering curves to avoid
losing control of the vehicle. Otherwise an accident
may occur.
NOTICE
When the snow tires must be repaired or replaced,
have them repaired or replaced by Lexus dealer or
authorized tire dealer. The tire pressure sensor will
be affected by the installation or removal of snow
tires.
 When the snow tires must be replaced, replace the
grommets for tire pressure sensors as well.
 Do not attempt to use a tire chain on the compact
spare tire, as it may result in damage to the vehicle as
well as the tire.
If the chains are installed, the tire pressure warning
system may not operate properly. See “Tire pressure
warning system” on page 433.

CHASSIS
560
REPLACING WHEELS
As you might have difficulty in identifying a flat or deflated
tire, a tire pressure warning system is provided on this
vehicle.
When replacing the wheels, be sure to install tire pressure
sensors on the wheels.
There are 2 ways to set up the tire pressure sensors.
a. Remove the sensor from the old wheel and install it to the
new wheel.
b. 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
purchased later, put the switch at “2nd”. For the sensor
selector switch, see page 442.
CAUTION
 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 sensor to transmit the electronic code in
different manner, resulting in the failure of the
system.
When to replace your wheels
If you have wheel damage such as bending, cracks or
heavy corrosion, the wheel should be replaced.
If you fail to replace a damaged wheel, the tire may slip off the
wheel or cause loss of handling control.
Replacement with used wheels is not recommended as they
may have been subjected to rough treatment or high mileage
and could fail without warning. Also, bent wheels which have
been straightened may have hidden structural damage and
therefore should not be used. Never use an inner tube in a
leaking wheel which is designed for a tubeless tire.

ELECTRICAL COMPONENTS
567
No.FUSEAMPERECIRCUIT
18 FR DOORRH20
Front right door control system
(Power door lock system,
Power rear view mirror control
system, Door courtesy light,
Outside rear view mirror heater,
Power window), Multiplex
communication system
19 RR DOOR RH20Rear right door control system
(Power door lock system, Door
courtesy light, Power window)
20 RR DOOR LH20Rear left door control system
(Power door lock system, Door
courtesy light, Power window)
21 FR DOORLH20
Front left door control system
(Power door lock system,
Power rear view mirror control
system, Door courtesy light,
Outside rear view mirror heater,
Power window)
22 RAD NO.310Audio system
23 HLP LVL7.5Adaptive front lighting system
(AFS), Automatic headlight
leveling control system
No.FUSEAMPERECIRCUIT
24 LHIG10
Charging system, Headlight
cleaners, Exhaust gas sensor,
Rear window defogger, Electric
cooling fans, Rear left door
control system, Front left door
control system, Emergency
flashers, Automatic
transmission, Seat belt
pretensioners, Intuitive parking
assist
25 FR WIP30Windshield wipers and washer
26 PANEL7.5
Steering switch illumination,
Audio system, Glove box light,
Automatic transmission selector
lever illumination, Console box
light, Adaptive variable
suspension switch illumination,
Cigarette lighter illumination, Air
conditioning system, Traction
control off switch illumination,
Driving pattern selector switch,
Seat heater or Heated and
ventilated seat switches,
Register ILL RH, Register ILL
LH, Register ILL CTR
27 FUEL
OPEN10Fuel filler door opener, Trunk lid
opener

ELECTRICAL COMPONENTS
568
No.FUSEAMPERECIRCUIT
28 ECUIG LH10
Vehicle stability control system,
Electronic control brake system,
Yaw rate and G sensor,
Steering sensor, Cruise control
system, Dynamic radar cruise
control system, Electronic
power steering system, Variable
gear ratio steering system,
Rear view monitor system,
Four−wheel drive system, Front
controller, Moon roof, Rain
sensor
29 FR S/HTR
LH15Seat heater, Heated and
ventilated seats
30 FR P/SEAT LH30Power seat system
31 A/C7.5Air conditioning system
32 TV7.5Audio system, Air conditioning
system, Rear view monitor
system
33 TRK OPN10Trunk lid opener
34 LHB10Theft deterrent system
35 S/ROOF25Moon roof
36 ECUB10
Variable gear ratio steering
system, Electronic power
steering system, Driver’s seat
switch module
37 ABS
MAIN310Electronic control brake system
No.FUSEAMPERECIRCUIT
38 TURNHAZ15Turn signal lights, Emergency
flashers
39 IG2 MAIN20“IG2”, “GAUGE” and “IGN”
40 RAD NO.230Audio system
41 D/C CUT20“DOME “ and “MPX− B”
42 RAD NO.130Audio system
43 MPXB10
Multiplex communication
system, Front controller, Door
control system (Power door
lock system, Door courtesy
lights, Power windows, Power
rear view mirror control system,
Outside rear view mirror
heaters), Power seat system,
Steering sensors, Electronic
control brake system, Power tilt
and telescopic steering system,
Gauges and meters,
Combination switch
44 DOME10
Foot lights, Vanity lights,
Gauges and meters, Steering
spot light, Steering switch
illumination, Rear personal
lights, Automatic transmission
selector lever spot light, Front
personal lights
45 ABS
MAIN210Electronic control brake system
46 ABS
MOTOR30Anti− lock brake system