2006 LEXUS LS430 lights

318
4-3. Do-it-yourself maintenance
CAUTION
■Discharge headlights
●Do not touch the high voltage socket while the headlights are turned on.
The sockets are usually ch ar
ged with 20,000 volts. Touching the socket may
cause severe injury due to electric shock
NOTICE
■To prevent damage or fire
●Make sure the bulb is fully seated and locked to prevent damage or fire.
●If your hands touch the glass portion of the bulb, wipe the bulb with alcohol
before use.
●Always have your Lexus dealer change the
discharged head lights. 
(Including light bulbs.)

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.

5
When trouble arises
329
5-2. Steps to take in an emergency
If the charging system warning light comes on, stop the vehicle immedi-
ately.
The following warnings indicate the pos
sibility of damage to the vehicle
that may lead to an ac cident. Immediately stop the vehicle in a safe place
and contact your Lexus dealer.
Warning lightsWarning light/Details
Discharge warning light
Indicates a malfunction in the vehicle’s charging
system.

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
331
5-2. Steps to take in an emergency
If the following warning lights come on, have the malfunction repaired
immediately.
After taking the specified steps to correct the suspected problem, check
that the warning light turns off.
Warning lightsWarning light/DetailsCorrection
procedures
Open door warning light 
(Warning buzzer)*1
Indicates that a door is not
fully closed.
Check that all doors
are closed.
Low fuel level warning light
Fuel level 
(Less than approximately 3
gal [12L, 2.6 Imp.gal.])Refuel the vehicle.
Driver’s seat belt reminder
light
(Warning buzzer)
Warns the driver to wear
his/her seat belt.
Wear the seat belt.

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
353
5-2. Steps to take in an emergency
If the engine will not start
If the engine will not start, even though correct starting procedures are being
followed (P.94), consider each of the following points. 
Contact your Lexus dealer if the problem cannot be repaired, or if repair pro -
cedures are unknown.
■ The engine will not start even wh en the starter motor operates nor-
mally
One of the following may be the cause of the problem.
• There may not be sufficient fuel in the vehicle’s tank. 
Add fuel to the vehicle.
• The engine may be flooded. 
Try to restart the engine once mor
e following correct starting
procedures (
P. 94 ). Hold the ignition switch in the START posi -
tion for a slightly longer period (u p to a maximum of 15 seconds).
■ The star
ter motor turns over slowly , the interior lights and headlights
are dim, or the horn does not sound or sounds at a low volume.
One of the following may be the cause of the problem.
• The battery may be discharged. (
P.356 )
• The battery terminal connectio ns may be loose or corr
oded.
■ The star
ter motor does not turn over, the interior lights and head-
lights do not turn on, or the horn does not sound.
One of the following may be the cause of the problem.
• One or both of the battery terminals may be disconnected.
• The battery may be discharged. (
P.356 )
• There may be a malfunction in the engine immobilizer system.  (
P.54)

5
When trouble arises
357
5-2. Steps to take in an emergency
■Avoiding a discharged battery
●Turn off the headlights and the audio system while the engine is turned off.
●Turn off any unnecessary electrical comp onents when the vehicle runs at a low
speed for an extended period, such as in heavy traffic, etc.
CAUTION
■Avoiding battery fires or explosions
Observe the following precautions to prevent accidentally igniting the flammable
ga

s that may be emitted from the battery.
• Make sure the jumper cable is connected to
the correct terminal and that it is
not unintentionally in contact with any part other than the intended terminal.
• Do not allow the booster cables to come into cont
act with the + and - terminals.
• Do not generate a flame near the battery b
y using a match, cigarette lighter, or
smoking.
■Battery precautions
The battery contains poisonous and corrosive electrolyte, while related parts con -
tain lead and lead compounds. 
Observe the following precautions when handling the battery.
• Do not lean over the battery
• When working with the battery, always we ar safety glas
ses and take care not to
allow any battery fluids (acid) to come into contact with skin, clothing or the
vehicle body.
• In the event that battery fluid comes into co
ntact with the skin or eyes, immedi-
ately wash the affected area with water and seek medical attention. Place a wet
sp
onge or cloth over the affected area until medical attention can be received.
• Always wash your hands after ha
ndling battery-related parts.
• Do not allow children near the battery.
Once the engine starts, have the vehicle checked at your Lexus dealer as
soon as possible.