2005 LEXUS LS430 overheating

SWITCHES
70
CAUTION
Occupants must use caution when operating the seat
heater because they may experience minor burns even
at low temperatures. Use extra caution for;
Babies, small children, elderly persons, sick persons
or persons with physical disabilities
 Persons who have delicate skin
 Persons who are exhausted
 Persons who have taken alcohol or drugs which
induce sleep (sleeping drug, cold remedy, etc.).
To prevent the seat from overheating, do not use the
seat heater with a blanket, cushion, or other insulating
objects which cover the seat.
NOTICE
 Do not put unevenly weighted objects on the seat and
do not stick sharp objects (needles, nails, etc.) into
the seat.
 When cleaning the seats, do not use organic
substances (paint thinner, benzine, alcohol,
gasoline, etc.). They may damage the heater and seat
surface.
 To prevent the battery from being discharged, turn
the switches off when the engine is not running.

SWITCHES
73
CAUTION
Use caution when operating the climate control seat.
The occupants listed below may experience minor
burns even at low temperatures from warm air.
Babies, small children, elderly persons, sick persons
or persons with physical disabilities
 Persons who have delicate skin
 Persons who are exhausted
 Persons who have taken alcohol or drugs which
induce sleep (such as sleeping drugs or cold
remedies).
To prevent the seat from overheating, do not use the
climate control seat if a blanket, cushion, or other
insulating object covers the seat. Use also caution not
to overuse this feature, which may cool down the
occupants excessively.
NOTICE
 Do not put unevenly weighted objects on the seat .
Do not stick sharp objects (such as needles or nails)
into the seat.
 When cleaning the seats, do not use harsh cleaning
substances (such as paint thinner, benzine, alcohol
or gasoline). They may damage the climate control
seat and seat surface.
 Clean the seats using a towel wrung out of water.
Entering water in the seats may cause the
malfunction of the climate control seats.
 To prevent the battery from being discharged, turn
the switches off when the engine is not running.

GAUGES, METERS AND SERVICE REMINDER INDICATORS
105
w278
The master warning light comes on, a warning tone
sounds 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,
but turns back on after a while.
w277
If there is a problem somewhere in the precollision safety
system, the master warning light comes on, a warning
tone sounds, and the above message appears.
If the above message appears, the pre −collision safety system
may not operate. Contact your Lexus dealer as soon as
possible to service the vehicle.
COMPASS
(Vehicles without Navigation System)
13L149
When the ignition is turned on, the previously selected display
appears. If the compass is not displayed, push the “DISP2”
button several times for 1 to 2 seconds to display the compass.
However if you push the main switch of dynamic radar/laser
cruise control to use dynamic radar/laser cruise control, the
dynamic radar/laser cruise control display appears. To change
to the compass display, push the “DISP2” button for longer
than about 1 second.
The compass indicates the direction in which the vehicle
is heading. The illustration shown above indicates that the
vehicle is heading north.

STARTING AND DRIVING
377
Precollision safety failure warning
31L589
If there is a problem somewhere in the precollision safety
system, the master warning light comes on, a warning
tone sounds, and either of the following messages may
appear.
w278
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,
but turns back on after a while.
w277
If there is a problem somewhere in the precollision safety
system, the above message appears.
If the above message appears, the pre −collision safety system
may not operate. Contact your Lexus dealer as soon as
possible to service the vehicle.

DRIVING TIPS
383
CAUTION
Before driving off, make sure the parking brake is
fully released and that the parking brake reminder
light is off.
 Do not leave your vehicle unattended while the
engine is running.
 Do not rest your foot on the brake pedal while driving.
It can cause dangerous overheating, needless wear,
and poor fuel economy.
 To drive down a long or steep hill, reduce your speed
and downshift. Remember, if you ride the brakes
excessively, they may overheat and not work
properly. See page 311.
 Be careful when accelerating, upshifting,
downshifting or braking on a slippery surface. The
abrupt change in engine speed, such as sudden
acceleration or engine braking, could cause the
vehicle to skid or spin.
 Do not drive in excess of the speed limit. Even if the
legal speed limit permits it, do not drive over 140 km/h
(85 mph) unless your vehicle has highspeed
capability tires. Driving over 140 km/h (85 mph) may
result in tire failure, loss of control and possible
injury. Be sure to consult a tire dealer to determine
whether the tires on your vehicle are highspeed
capability tires or not before driving at such speeds.
 Do not continue normal driving when the brakes are
wet. If they are wet, your vehicle will require a longer
stopping distance, and it may pull to one side when
the brakes are applied. Also, the parking brake will
not hold the vehicle securely.

DRIVING TIPS
391

Because of the added load of the trailer, your vehicle’s
engine may overheat on hot days (at temperatures over
30 C [85 F]) when going up a long or steep grade with a
trailer. If the engine coolant temperature gauge indicates
overheating, immediately turn off the air conditioning (if in
use), pull your vehicle off the road and stop in a safe spot.
See “If your vehicle overheats” on page 404.
 Always place wheel blocks under both the vehicle and trailer
wheels when parking. Apply the parking brake firmly. Put
the transmission in “P”. Avoid parking on a slope with a
trailer, but if it cannot be avoided, do so only after performing
the following:
1. Apply the brakes and keep them applied.
2. Have someone place wheel blocks under both the vehicle
and trailer wheels.
3. When the wheel blocks are in place, release your brakes
slowly until the blocks absorb the load.
4. Apply the parking brake firmly.
5. Shift into “P” and turn off the engine. When restarting out after parking on a slope:
1. With the transmission in “P” position, start the engine. Be
sure to keep the brake pedal depressed.
2. Shift into the “3” (third range), “2” (second range), “\
1” (first
range) or “R” position.
3. Release the
parking brake and brake pedal and slowly pull
or back away from the wheel blocks. Stop and apply your
brakes.
4. Have someone retrieve the blocks.
CAUTION
 Do not exceed 72 km/h (45 mph) or the posted towing
speed limit, whichever is lower. Because instability
(swaying) of a towing vehicletrailer combination
usually increases as the speed increases, exceeding
72 km/h (45 mph) may cause loss of control.
 Slow down and downshift before descending steep
or long downhill grades. Do not make sudden
downshifts.
 Avoid holding the brake pedal down too long or too
frequently. This could cause the brakes to overheat
and result in reduced braking efficiency.

DRIVING TIPS
392
HOW TO SAVE FUEL AND MAKEYOUR VEHICLE LAST LONGER
Improving fuel economy is easy − just take it easy. It will help
make your vehicle last longer, too. Here are some specific tips
on how to save money on both fuel and repairs:
 Keep your tires inflated at the correct pressure. Check
the pressure every two weeks, or at least once a month.
Underinflation causes tire wear and wastes fuel.
 Do not carry unneeded weight in your vehicle. Excess
weight puts a heavier load on the engine, causing greater
fuel consumption.
 Avoid lengthy warmup idling. Once the engine is
running smoothly, begin driving − but gently. Remember,
however, that on cold winter days this may take a little
longer.
 Always keep the automatic transmission selector lever
in the “D” position when engine braking is not required.
Driving with the overdrive off will reduce the fuel economy
(For details, see “Automatic transmission” on page 305.)
 Accelerate slowly and smoothly. Avoid jackrabbit starts.
 Avoid long engine idling. If you have a long wait and you
are not in traffic, it is better to turn off the engine and start
again later.
 Avoid engine overrevving. Use a gear position suitable
for the road on which you are traveling. 
Avoid continuous speeding up and slowing down.
Stop−and−go driving wastes fuel.
 Avoid unnecessary stopping and braking. Maintain a
steady pace. Try to time the traf fic signals so you only need
to stop as little as possible or take advantage of through
streets to avoid traffic lights. Keep a proper distance from
other vehicles to avoid sudden braking. This will also
reduce wear on your brakes.
 Avoid heavy traffic or traffic jams whenever possible.
 Do not rest your foot on the brake pedal. This causes
premature wear, overheating and poor fuel economy.
 Maintain a moderate speed on highways. The faster you
drive, the greater the fuel consumption. By reducing your
speed, you will cut down on fuel consumption.
 Keep the front wheels in proper alignment. Avoid hitting
the curb and slow down on rough roads. Improper
alignment not only causes faster tire wear but also puts an
extra load on the engine, which, in turn, wastes fuel.
 Keep the bottom of your vehicle free from mud, etc.
This not only lessens weight but also helps prevent
corrosion.

IN CASE OF AN EMERGENCY
404
IF YOU CANNOT INCREASEENGINE SPEED
If engine speed does not increase when the accelerator
pedal is depressed, there may be a problem somewhere
in the electronic throttle control system . Move the vehicle
to a safe place by means of creeping and call a Lexus
dealer for assistance:
1. Depress the brake pedal and shift to the “D” position.
2. Gradually release the brake pedal, and the vehicle starts to
move by creeping. After arriving at a safe place, stop the
vehicle and call a Lexus dealer for assistance.
CAUTION
 The above method of moving the vehicle is for
emergency. Use it only for moving minimum
distances to a safe place.
 Be especially careful to prevent erroneous pedal
operation.
IF YOUR VEHICLE OVERHEATS
If your engine coolant temperature gauge indicates
overheating, if you experience a loss of power, or if you
hear a loud knocking or pinging noise, the engine has
probably overheated.
When the engine overheats
Pull safely off the road, stop the vehicle and turn on your
emergency flashers. Put the transmission in “P” and apply the
parking brake.
A: If steam is coming from your engine:
Turn off the engine. Leave the hood closed until there is no sign
of steam or coolant. Your engine could have been seriously
damaged already. Call your Lexus dealer for assistance.
CAUTION
To help avoid personal injury, keep the hood closed until
there is no steam. Escaping steam or coolant is sign of
very high pressure.