2006 LEXUS LS430 brake

324
5-1. Essential information
If you think something is wrong
If you notice any of the following symptoms, your vehicle probably needs
adjustment or repair. Contact your Lexus dealer as soon as possible.
■Visible symptoms
Look for any of the following symptoms.
• Fluid leaks under the vehicle
Water dripping from the air conditioning after use is normal
• Flat-looking tires or uneven tire wear
• Engine coolant temperature gauge needle continually points higher
than normal
■ A
udible symptoms
Listen for any of the following symptoms.
• Change in exhaust sound
• Excessive tire squeal when cornering
• Strange noises related to suspension system
• Pinging or other noises related to engine
■ P
roblems with operation
Check for any of the following symptoms.
• Engine missing, stumbling or running rough
• Appreciable loss of power
• Vehicle pulls to heavily one side when braking
• Vehicle pulls to heavily one sid e when driving on a le
vel road
• Loss of brake effectiveness, sp ongy feeling, pedal almost touches
floor

326
5-1. Essential information
Event data recorder
In a crash or a near car crash event
This device records some or all of the following information.
• Engine speed
• Whether the brake pedal was applied or not
• Vehicle speed
• To what extent the accelerator pedal was depressed
• Position of the transmission selector lever
• Whether the driver and front passenger wore the seat belts or not
• Driver's seat position
• SRS airbag deployment data
• SRS airbag system diagnostic data
Your vehicle has computers that monitor and control certain aspects of your
vehicle. These computers assist in dr iving and maintaining optimal vehicle
performance.

Besides storing data useful for troubles hooting,
there is a system to record
data in a crash or a near car crash event.

328
5-2. Steps to take in an emergency
If a warning light turns on...
If the brake system warning light comes on, stop the vehicle immediately.
The following warning indicates a possible problem in the brake system.
Continuing to drive the vehicle may be dangerous. 
Immediately stop the vehicl e in a safe place and contact y
our Lexus
dealer.
* Parking brake engaged warning buzzer:
A buzzer will sound if the vehicle is driv en at a speed of approximately 3 mph (5
km/h) or more.
Calmly perform the following actions if any of the warning lights turn on or
flash. If a light turns on or flashes, but then turns off, this does not necessarily
indicate a malfunction in the system.
Warning lightsWarning light/Details
(U.S.A)
(Canada)
Brake system warning light (Warning buzzer)*
• Low brake fluid
• Malfunction in the brake booster system This light also comes on when the parking brake
is not released. If the light turns off after the
parking brake is fully released the system is
operating normally.

330
5-2. Steps to take in an emergency
If the following warning lights come on, have the vehicle inspected
immediately.
Failing to investigate the cause of the following warnings may lead to a
system operating abnormally and possibly cause an accident. 
Have the vehicle inspected by your Lexus dealer immediately.
Warning lightsWarning light/Details
(U.S.A)
(Canada)
Malfunction indicator lamp
Indicates a malfunction in:
• The electronic en gine contr
ol system;
• The electronic throttle control system; or
• The electronic automatic tr
ansmission con-
trol system.
SRS warning light
Indicates a malfunction in:
• The SRS airbag system; or
• The seat belt pretension system.
Automatic headlight leveling system and adaptive
front lighting system
Indicates a malfunction in:
• The automatic head light leveling system; or
• The adaptive front lighting system, if the light
flashes.
(U.S.A)
(Canada)
ABS warning light
Indicates a malfunction in:
• The Anti-lock Braking System ABS; or
• The brake assist system.

5
When trouble arises
333
5-2. Steps to take in an emergency
■If the electronic engine control system warning light remains on while driving
First check the following:
• Check fuel level, if the fuel tank is empty, refuel immediately.
• Check the fuel tank cap is loose tighten it securely.
The light will go off after driving regularly for some time.
If the light does not go off even after several trips, contact your Lexus dealer as soon
a
s possible.
■Front passenger detection sensor an d passenger’s seat belt reminder
●If luggage is placed on the front passenger seat, the front passenger detection
sensor may cause the warning light to flash and a chime to sound, even if a pas -
senger is not sitting in the seat.
●If a cushion is placed on the seat, the sensor may not detect a passenger, and the
warning light may not operate properly.
CAUTION
■If both the ABS and brake system warning lights remain on
Stop your vehicle in a safe place immediately and contact your Lexus dealer. The
v

ehicle will become extremely unstable during braking, and the ABS system may
fail, which could cause an accident resulting in death or serious injury.

5
When trouble arises
335
5-2. Steps to take in an emergency
Have the vehicle inspected by your Lexus dealer immediately.
Failing to investigate the cause of the following warnings may lead to the
system operating abnormally and possibly cause an accident.
Have the vehicle inspected by your Lexus dealer immediately.
Warning message and
lightDetails
(flashes)
Brake wear warning
Indicates that your brake pads have worn down
enough to require replacement.
and
VSC and TRAC warning
Indicates a malfunction in the vehicle stability
control system or the traction control system.
These systems do not work while the warning
message is displayed, however, it is no problem
to continue normal driving.
Tire pressure warning system failure warning
Indicates a malfunction in the tire pressure
w
arning system. The system does not work
while the warning message is displayed, how -
ever, it is no problem to continue normal driving.
(flashes)
Steering lock cable failure warning
Indicates that the interlock cable for the steer -
ing lock is faulty.

338
5-2. Steps to take in an emergency
Warning message and lightDetailsCorrection procedures
(flashes)
Open moon roof warn-
ing
If the driver's door is
opened with the igni-
tion switch turned off
and the moon roof is
opened.
Close the moon roof
when you leave your
vehicle.
Parking brake warning
(Warning buzzer)*1
Indicates that the
parking brake is not
released.Release the parking
brake.
Low tire pressure
warning
Tire inflation pressure
is low.Adjust the tire inflation to
the specified pressure.
Low washer fluid warn -
ing
Washer fluid level is
low.Fill the washer fluid tank.
Air conditioning filter
warning
Indicates that the air
conditioning filter is
clogged enough to
require replacement.Change the air condi-
tioning filter.

5
When trouble arises
347
5-2. Steps to take in an emergency
If you have a flat tire
Remove the flat tire and replace it with the spare provided.
■Before jacking the vehicle
●Stop the vehicle on a hard, flat surface.
●Set the parking brake.
●Set the transmission selector lever in P.
●Stop the engine.
●Turn on the emergency flashers.
■ Location of spar
e tire jack and jacking position
Tire jack position Spare tire
Tire jack
Tool box Jack handle