2005 LEXUS LS430 engine

KEYS AND DOORS
16
NOTICE
Do not let the key case become bent as the key plate
may fall out or become bent also.
 The flat key is designed for emergency use only, so
do not use it regularly instead of the other master
keys.
11L021-2
When using a key containing a transponder chip,
observe the following precautions:
When starting the engine, do not use the key with a
key ring resting on the key grip and do not press the
key ring against the key grip. Doing so may prevent
the engine from starting, or may cause the engine to
stop soon after it starts.
11R055
When starting the engine, do not use the key in
proximity with other transponder keys (including the
flat key and keys of other vehicles), and do not press
other key plates against the key grip. Doing so may
prevent the engine from starting, or may cause the
engine to stop soon after it starts. If this happens,
remove the key once and then insert it again after
removing other transponder keys (including the flat
key and keys of other vehicles) from the ring or while
gripping or covering them with your hand to start the
engine.

KEYS AND DOORS
17
11L358
Do not bend the key grip or flat key.
 Do not cover the key grip or flat key with any material
that cuts off electromagnetic waves.
 Do not knock the key or flat key hard against other
objects.
 Do not leave the key or flat key exposed to high
temperatures for a long period, such as on the
dashboard or hood under direct sunlight.
 Do not put the key or flat key in water or wash it in an
ultrasonic washer.
 Do not use the key or flat key with electromagnetic
materials.
ENGINE IMMOBILIZER SYSTEM
Deactivation using the smart key system
11L222a
The engine immobilizer system is a theft prevention
system. When you enter the vehicle carrying a smart key
and push the ignition switch, the electronic code in the
key is automatically checked to determine whether it
corresponds to the registered ID code for the vehicle. If
the key indicator light comes on after the ID code
verification, you can start the engine.
This system is automatically set when the ignition switch is
turned to the “LOCK” position. At this time, the security
indicator light flashes. When you push the ignition switch, the
security indicator light goes out and the system is cancelled
automatically, which enables the engine to start.
The engine immobilizer system cannot be cancelled if the
cancel switch of the smart key system is turned on. For details,
see “Deactivating the smart key system” on page 34.

KEYS AND DOORS
18For your Lexus dealer to make you a new key with built
−in
transponder chip, your dealer will need your key number and
master key. However, there is a limit to the number of
additional keys your Lexus dealer can make for you.
If you make your own duplicate key, you will not be able
to cancel the system or start the engine.
NOTICE
Do not modify, remove or disassemble the engine
immobilizer system. If any unauthorized changes or
modifications are made, proper operation of the system
cannot be guaranteed.
Deactivation using the key
11L223a
 1 Type A 2Type B
The engine immobilizer system is a theft prevention
system. When you insert the key in the ignition switch, the
transponder chip in the key’s head transmits an electronic
code to the vehicle. The engine will start only when the
electronic code in the chip corresponds to the registered
ID code for the vehicle.
The system is automatically set when the key is removed from
the ignition switch. At this time, the security indicator light
flashes. When you insert the key in the ignition switch, the
security indicator light goes out and the system is canceled
automatically, which enables the engine to start.
The transponder chip of the flat key is in its key case. You can
cancel the engine immobilizer system using the flat key. (For
details, see pages 12 and 15.)

KEYS AND DOORS
19
For your Lexus dealer to make you a new key with built
−in
transponder chip, your dealer will need your key number and
master key or the flat key. However, there is a limit to the
number of additional keys your Lexus dealer can make for you.
If you make your own duplicate key, you will not be able
to cancel the system or start the engine.
For vehicles sold in U.S.A.
FCC ID: MOZRI20BTY
MADE IN JAPAN
FCC ID: MOZRI15HTYMADE IN JAPAN
This device complies with Part 15 of the FCC Rules.
Operation is subject to the following two conditions:
(1) This device may not cause harmful interference,
and (2) this device must accept any interference re-
ceived, including interference that may cause unde-
sired operation.
CAUTION
Changes or modifications not expressly approved by
the party responsible for compliance could void the
user’s authority to operate the equipment.
For vehicles sold in Canada
This device complies with RSS− 210 of Industry
Canada.
Operation is subject to the following two conditions:
(1) This device may not cause interference, and (2)
this device must accept any interference, including
interference that may cause undesired operation of the
device.

11L229c
KEYS AND DOORS
20
SMART KEY SYSTEM (Master keys only)
 1Locking and unlocking 2Unlocking the trunk lid 3Key indicator 4Starting the engine
By carrying a smart key, which is different from a conventional key that is inserted in the key\
holes or ignition switch, you
can lock and unlock the doors, unlock the trunk and start the engine.
For locking the doors, see “Locking the doors with the smart key system”\
on page 25. For unlocking the doors, see “Unlocking t he
door(s) with smart key system” on page 28. For unlocking the trunk lid, see \
“Unlocking the trunk lid with smart key system” on page
31. For starting the engine, see “Smart ignition system with steerin\
g lock” on page 298.
If the smart key battery is discharged, the smart key system cannot be use\
d. Use the mechanical key integrated into the smart key
by inserting it in the door keyhole to lock or unlock doors and into the\
trunk lid keyhole to unlock the trunk lid. To start t he engine,
insert the smart key. In order to activate the smart key system, the battery should be replaced. For details, see “Replacing the battery
(Type A)” on page 42.
You can deactivate the smart key system by using the cancel switch. In th\
is case, all the functions in the smart key system wi ll be
deactivated. For details, see “Deactivating the smart key system” on page 34.\

KEYS AND DOORS
21
INFORMATION
Be sure to take the smart key with you.
 In the following cases, the smart key system or
wireless remote control feature may not operate
properly. (If this happens, use a mechanical key to
lock or unlock the doors and trunk lid and a smart key
to start the engine.)
When facilities issuing strong electromagnetic
waves such as TV towers, electric power stations,
broadcasting stations are nearby.
When you are carrying a smart key together with a
mobile communications system such as a
twoway radio or cellular phone.
When the smart key is in contact with or covered
by a metallic object.
When another person is operating a wireless
remote control function on another vehicle near
your vehicle.
 If you do not drive your vehicle, store the smart key,
keeping it at least 5 m (15 ft.) away from the vehicle.
Alarms and warning messages
Your Lexus is equipped with alarms inside and outside, as
well as warning messages in the multiinformation
display, that remind you if there is a problem involving the
smart key system.
Cases which are expected to happen frequently are
shown in the illustrations and the other cases are
described in the table. If an alarm or warning message
comes on, check to see what the problem is referring to
the illustrations and table, and take the appropriate
measure.

KEYS AND DOORS
34
Deactivating the smart key system
11L341b
 1Smart key system is on.
2Smart key system is off.
The cancel switch for this system is located at the bottom
of the instrument panel on the driver side. When you push
the button, the smart key system will be deactivated.
Pushing the button again will reactivate the system.
When the smart key system is deactivated, use a mechanical
key or wireless remote control function key to lock and unlock
the doors or unlock the trunk lid. To start the engine, insert a
smart key into the ignition switch.
If you do not intend to drive your vehicle for a long time, push
the cancel switch to deactivate the smart key system.
INFORMATION
The smart key system will be deactivated in the
following cases:
 The key cancel switch is turned on.
 The smart key is inserted into the ignition switch.
 The battery of the smart key is discharged. (In this
case, the indicator on the smart key does not blink
even if you push a button on the key.)

KEYS AND DOORS
50
THEFT DETERRENT SYSTEM
17L013
To deter theft of the vehicle, this system is designed to
sound an alarm if any of the doors, trunk or hood is
forcibly unlocked or opened or the battery terminal is
disconnected and then reconnected while the vehicle is
locked.
The alarm blows the horn intermittently, flashes the headlights,
tail lights, turn signal lights and other exterior lights. When the
interior light switch is in the “DOOR” position, the interior lights
also turn on.
After the alarm is activated, when you unlock any door or the
trunk using an ignition key or wireless remote control or smart
key system, the tail lights turn on for about 2 seconds to inform
you that the system was activated.
17L021
 Security indicator light
Setting the system
In the case of the smart key system:
1. Turn the ignition switch to the “LOCK” position.
The engine immobilizer system causes to the indicator light to
flash.
2. Close and lock all the doors, trunk and hood using an
ignition key or wireless remote control or smart key
system.
If you lock them with wireless remote control or smart key
system, the turn signals flash once.*
NOTE:
* The turn signals can be set not to flash.
Ask your Lexus dealer for details.