change wheel lexus LS400 1998 Electrical Components / LEXUS 1998 LS400 OWNER'S MANUAL (OM50498U)

COMFORT ADJUSTMENT
70
FRONT SEATS
Front seat precautions
CAUTION
The SRS side airbags are installed in the driver and front
passenger seats. Observe the following precautions.
Do not lean over the front door when the vehicle is in use.
The side airbag inflates with considerable speed and force;
you may be killed or severely injured.
Do not modify or replace the seats or the surface of the seats
with side airbags. Such changes may disable the system, or
cause the side airbags to inflate, resulting in death or
serious injury. Consult your Lexus dealer.
Do not use accessories for the seats which cover the parts
where the side airbags should inflate. Such accessories may
prevent the side airbags from activating correctly, causing
death or serious injury.
Seat adjustment precautions
Adjust the driver’s seat so that the foot pedals, steering wheel and
instrument panel controls are within easy reach of the driver.
CAUTION
Do not adjust the seat while the vehicle is moving as the seat
may unexpectedly move and cause the driver to lose control
of the vehicle.
Be careful not to hit the seat against a passenger, luggage or
the rear seat.
NOTICE
Do not operate the control switch in more than one dimension
at a time. It may cause electrical overload.

COMFORT ADJUSTMENT
95
16L179
Do not attach a cup holder or any other device on or around
the door. When the side airbag inflates, the cup holder or
any other device will be thrown with great force, or the side
airbag may not activate correctly, resulting in death or
serious injury. Likewise, the driver and front passenger
should not hold things in their arms or on their knees.
Do not use accessories for the seats which cover the parts
where the side airbags should inflate. Such accessories may
prevent the side airbags from activating correctly, causing
death or serious injury.
Do not modify or remove any wiring. Do not modify,
remove, strike or open any components, such as the
steering wheel column cover, front passenger airbag cover,
front seats, airbag sensor assembly or seat belt assemblies.
Doing any of these may cause sudden SRS operation or
disable the system, which could result in death or serious
injury.
Do not modify or replace the seats or surface of the front
seats with side airbags. Such changes may disable the
system or cause the side airbags to inflate, resulting in
death or serious injury. Consult your Lexus dealer.
Failure to follow these instructions can result in death or
serious injuries.

COMFORT ADJUSTMENT
96
NOTICE
Do not perform any of the following changes without consulting
your Lexus dealer. Such changes can interfere with proper
operation of the SRS in some cases.
Installation of electronic items such as a mobile twoway
radio, cassette tape player or compact disc player.
Modification of the suspension system.
Modification of the front end structure and side structure of
the passenger compartment.
Attachment of a grille guard (bull bar, kangaroo bar, etc.),
snow plow, winches or any other equipment to the front end.
Repairs made on or near the front fenders, front end
structure, console, steering column, steering wheel,
dashboard near the front passenger airbag, front seats or seat
belt assembly.
16L136-2
This SRS has an indicator to inform the driver of operating problems.
If either of the following conditions occurs, this indicates a
malfunction of the airbags and/or seat belt pretensioners. Even if the
seat belt pretensioners should fail, the seat belts will operate
conventionally. Contact your Lexus dealer as soon as possible to
service the vehicle.
The light does not come on as described above.
The light stays on or flashes.
The light comes on or starts flashing while driving.
If the light stays on, it indicates that the driver and front passenger
airbags fail. If the light flashes, the side airbags and/or seat belt
pretensioners fail.

COMFORT ADJUSTMENT
114The beep sound means that the positions are recorded in the
computer ’s memory.
By repeating these two steps and pressing the remaining button, the
driving position for another driver can be recorded.
To set a new memorized position, select the desired position and
perform step 2. The previous memory will be erased and the new
position will be set.
To make only slight changes to an already memorized position, the
easiest way is to first activate the memorized position, then make the
desired changes and perform step 2 above.
Activating a memorized position
16L056
When you push button ”1” or ”2”, the driving position will be
automatically adjusted to the position recorded for that button.Conditions for memorized position activation
Ignition key ”ON” and shift lever in ”P” position.
All parts of the memorized positions can be activated.
However, if the brake pedal is being depressed, the seat position
will not change.
Key not in ignition switch and within 30 seconds of opening
driver’s door.
The memorized position can be activated, except for the tilt and
telescopic steering.
If any driving position memory switch is pushed while one of the
memorized driving position profiles is being activated, the operation
will stop.
To activate the system, push the desired button (”1” or ”2”) again.
The driving position memory control system cannot be operated
while the vehicle is moving.
If the vehicle’s battery is disconnected, the computer’s memory will
be erased and the memorized positions will have to be set again.
CAUTION
Do not start the vehicle while the adjustments are being
made.
Take care not to select the wrong button, or the seat could
strike the rear passenger or hit your body against the
steering wheel. If this happens, you can stop the movement
by pressing another driving position memory switch, or
depressing the brake pedal.

STARTING AND DRIVING
158driver’s door, a buzzer will remind you to remove the key.*
NOTE: *The volume or interval of beep sound can be changed.
Ask your Lexus dealer for details.
31L0031
”LOCK” Engine is off and the steering wheel is locked. The
ignition key can be removed only at this position.
To turn the key from ”ACC” to the ”LOCK” position, you must put
the transmission selector lever in the ”P” position.
Once you remove the key, the engine immobiliser system is
automatically set. See ”Engine immobiliser system” on page 10.
When starting the engine, the key may seem stuck at the ”LOCK”
position. To free it, first be sure the key is pushed all the way in, and
then rock the steering wheel slightly while turning the key gently.
If, in an emergency, you must turn the engine off while the vehicle
is moving, turn the key only to ”ACC”.
PARKING BRAKE
31L005
1
To set: Fully depress the parking brake pedal.
2
To release: Pull the parking brake release lever.
Before leaving your vehicle, firmly apply the parking brake.
CAUTION
Before driving, make sure the parking brake is fully released
and that the parking brake reminder light is off.

STARTING AND DRIVING
168In the power mode, the ”ECT PWR” light in the instrument cluster
is on and the transmission is shifted up at higher vehicle speeds and
shifted down more responsively than is the normal mode.
To return to the normal mode, push the driving pattern selector
switch lightly on the ”SNOW” side.
Snow mode: For slippery road surfaces such as in snow. In this
mode, the spinning of the rear wheels is controlled appropriately.
When you push the driving pattern selector switch on the ”SNOW”
side, the snow mode is turned on and the ”ECT SNOW” light in the
instrument cluster comes on.
To return to the normal mode, push the driving pattern selector
switch on the ”SNOW” side again.
When you turn the ignition switch off in the snow mode, the mode
automatically changes to the normal mode.
CRUISE CONTROL
The cruise control allows you to cruise the vehicle at a desired
speed over 40 km/h (25 mph) with your foot off the accelerator
pedal.
Your cruising speed can be maintained although a slight speed
change may occur when driving up or down a gradient, within the
limits of engine performance. On steeper hills, a great speed change
will occur so it is better to drive without the cruise control.
When the cruise control is on, the driving pattern of the automatic
transmission is fixed in the normal position, regardless of the
position of the selector switch.
CAUTION
To help maintain maximum control of your vehicle, do not
use the cruise control when driving in heavy or varying
traffic, or on slippery (rainy, icy or snowcovered) or
winding roads.
Avoid vehicle speed increases when driving downhill. If the
vehicle speed is too fast in relation to the cruise control set
speed, cancel the cruise control then downshift the
transmission to use engine braking to slow down.

IN CASE OF AN EMERGENCY
198Stop 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 continue driving with a deflated tire. Driving even a short
distance can damage a tire beyond repair.
40L003-1
1
Tool box 2
Jack 3
Spare tire 4
Jack handle
1. Get the tool, jack and spare tire.
To prepare yourself for an emergency, you should familiarize
yourself with the use of the jack and each tool, and their storage
locations.

MAINTENANCE
215 Tire rotation
Rotate the tires every 12000 km (7500 miles). See page 242 for
additional information.
Fluid leaks
Check underneath for leaking fuel, oil, water or other fluid after the
vehicle has been parked for a while. If you smell fuel fumes or notice
any leak, have the cause found and corrected immediately.
Doors and engine hood
Check that all doors, including trunk lid, operate smoothly and all
latches lock securely. Make sure the engine hood secondary latch
secures the hood when the primary latch is released.
Vehicle interior
Items listed below should be checked regularly, e.g. while
performing periodic services, cleaning the vehicle, etc.
Lights
Make sure the headlights, stop lights, tail lights, turn signal lights,
and other lights are working. Check headlight aim.
Service reminder indicators and warning buzzers
Check that all service reminder indicators and warning buzzers
function properly.Steering wheel
Check that it has the specified freeplay. Be alert for changes in
steering condition, such as hard steering, excessive freeplay or
strange noise.
Seats
Check that all front seat controls such as seat adjusters, seatback
recliner, etc. operate smoothly. Check that the head restraints move
up and down smoothly and that the locks hold securely in any latched
position.
Seat belts
Check that the seat belt system such as buckles, retractors and
anchors operate properly and smoothly. Make sure the belt webbing
is not cut, frayed, worn or damaged.
Accelerator pedal
Check the pedal for smooth operation and uneven pedal effort or
catching.
Brake pedal
Check the pedal for smooth operation and the proper clearance and
freeplay. Check the brake booster function.
Brakes
At a safe place, check that the brakes do not pull to one side when
applied.

CHASSIS
245
Tire selection
When replacing a tire, use only the same size and construction
as originally installed and with the same or greater load capacity.
Using any other size or type of tire may seriously affect handling,
ride, speedometer/odometer calibration, ground clearance, and
clearance between the body and tires or snow chains.
Do not mix radial, belted, or conventional tires on your vehicle.
Do not use tires or wheels other than the manufacturer’s
recommended size.
It can cause dangerous handling characteristics, resulting in loss of
control. If you need to change from conventional tires to radial tires
or vice versa, replace them as a set.
INSTALLING SNOW TIRES AND
CHAINS
When to use snow tires or chains
Snow tires or chains are recommended when driving on snow or
ice.
On wet or dry roads, conventional or radial tires provide better
traction than snow or studded tires.
Snow tire selection
If you need snow tires, select the same size, construction and load
capacity as the original tires on your Lexus.
Do not use tires other than stated above. Since your vehicle has
radial tires as original equipment, make sure your snow tires also
have radial construction. Do not install studded tires without first
checking local regulations for possible restrictions.
Snow tire installation
Snow tires should be installed on all wheels.
Installing snow tires on the rear wheels only can lead to an excessive
difference in road grip capability between the front and rear tires
which could cause loss of vehicle control.

CHASSIS
247
REPLACING WHEELS
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 damaged wheels, a tire may slip off a wheel or
they may 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.
Wheel selection
When replacing wheels, care should be taken to ensure that they
are equivalent to those removed in load capacity, diameter, rim
width, and offset.
Correct replacement wheels are available at your Lexus dealer.
A wheel of a different size or type may adversely affect handling,
wheel and bearing life, brake cooling, speedometer/odometer
calibration, stopping ability, headlight aim, bumper height, vehicle
ground clearance, and tire or snow chain clearance to the body and
chassis.
ALUMINUM WHEEL
PRECAUTIONS
After driving your vehicle the first 1600 km (1000 miles), check
that the wheel nuts are tight.
If you have rotated, repaired, or changed your tires, check that the
wheel nuts are still tight after driving 1600 km (1000 miles).
When using tire chains, be careful not to damage the aluminum
wheels.
Use only the Lexus wheel nuts and wrench designed for your
aluminum wheels.
When balancing your wheels, use only Lexus balance weights or
equivalent and a plastic or rubber hammer.
As with any wheel, periodically check your aluminum wheels for
damage. If damaged, replace immediately.
SUSPENSION AND CHASSIS
CAUTION
Do not modify the suspension/chassis with lift kits, spacers,
springs, etc. It can cause dangerous handling characteristics,
resulting in loss of control.