ANTI THEFT PROTECTION SYSTEMS
IMMOBILISER
LECTURER NAME: MR. KHAIRUL AKMAL BIN NUSI
INTRODUCTION
• Vehicle insurance companies demanded in the 90’s an
effective technical protection against car theft to be developed
by the car manufactures. A primary requirement of the
insurance companies was that the anti-theft system should
activate itself automatically.Therefore, the car manufacturers
developed the self-activating immobilizer system as an
electronic anti-theft device. It prevents an engine start with an
ignition key unknown to the immobilizer system. This means
that the immobilizer function is only deactivated when the
ignition is switched on with a registered key and activated
automatically when the ignition is switched off.
THE IMMOBILISER SYTEM OPERATION
• This vehicle has a passive theft-deterrent system.
• The system does not have to be manually armed or
disarmed. The vehicle is automatically immobilized
when the key is removed from the ignition.
• The system is automatically disarmed when the
vehicle is started with the correct key. The key uses a
transponder that matches an immobilizer control unit
in the vehicle and automatically disarms the system.
Only an authorized key starts the vehicle. The vehicle
may not start if the key is damaged.
• The security light, located in the instrument panel
cluster, comes on if there is a problem with
arming or disarming the theft-deterrent system.
• When trying to start the vehicle, the security light
comes on briefly when the ignition is turned on.
• If the engine does not start and the security light
stays on, there is a problem with the system. Turn
the ignition off and try again.
• If the engine still does not start, and the key
appears to be undamaged or the light continues to
stay on, try another ignition key.
IMMOBILISER OPERATION DIAGRAM
TRANSPONDER
• a transponder is one of two types of devices.
In air navigation or radio frequency identification, a
transponder is a device that emits an identifying
signal in response to an interrogating received
signal.
• In a communications satellite, a transponder gathers
signals over a range of uplink frequencies and retransmits them on a different set of downlink
frequencies to receivers on Earth, often without
changing the content of the received signal or
signals.
TRANSPONDER DIAGRAM
ANTENNA COIL
• I see various UHF antennas for the 800 and 900
MHz bands, for both cellular and ham radio use,
that have coils of different lengths, some have
more loops, some have less, others have the coil
half way up the antenna, others have it close to
the base.
• What function does the coil serve and how do the
different coil characteristics affect the antenna's
performance?
ANTENNA DIAGRAM
FAULT LAMP
• Immobiliser / key recognition system defect warning light
• This indicates that either the chip within the key has
not been recognized by the key reader or there is a
fault with the key reader itself.
• Either way the vehicle will / may crank and fail to
start or even fail to crank depending on the system;
during the attempt to start the vehicle this symbol
may stay illumined or flash.
• If the key has been dropped and come apart it is
worth checking that the chip / transponder has been
refitted into the key or try a spare key.
FAULT LAMP DIAGRAM
DESCRIBE CODING THE KEYS
EXPLANATION CODING KEYS
• Insert the first previously programmed coded key into the
ignition.
• Turn the ignition from off to on. Keep the ignition on for at
least three seconds, but no more than 10 seconds.
• Turn the ignition off and remove the first coded key from
the ignition.
• After three seconds, but within ten seconds of turning off
the ignition, insert the second previously coded key into the
ignition.
• Turn the ignition from off to on. Keep the ignition on for at
least three seconds, but no more than 10 seconds.
• Turn the ignition off and remove the second
previously programmed coded key from the ignition.
• After three seconds, but within 20 seconds of turning
the ignition off and removing the previously coded
key, insert the new unprogrammed key into the
ignition.
• Turn the ignition from off to on. Keep the ignition on
for at least six seconds.
• Remove the newly programmed coded key from the
ignition.
TRANSMITING AND RECIEVER MODULE
• That provides a complete remote control switch
function in a module format, delivering reliable.
• Long range operation in situations where existing
wide band solutions cannot offer adequate range, or
where band congestion requires multiple channel
operation.
• With the inclusion of easy to use, single-function
controllers/actuators, the CXT and CXR modules are
highly suited to tasks that just call for a simple on/off
control function (such as flood light control, machine
override shutdown.
TRANSMITTING AND RECEIVER
MODULE (DIAGRAM)
IMMOBILISER ECU
• The engine immobilizer system is designed to prevent
the vehicle from being stolen.
• This system uses a transponder key ECU that stores
the key codes of authorized ignition keys.
• When the ECU detects that the unlock warning
switch is ON, the ECU provides current to the
transponder key coil and produces a faint electric
wave.
IMMOBILIZER ECU
IMMOBILIZER MASTER KEY
• Immobilizer reset and new Master Key registration
by starting the vehicle.
• All previously registered key codes have been erased
except the Master Key used during “Key Code Reset.
• Register any additional customer keys by using “Key
Registration.”
• Each key will start the engine if registered correctly.
IMMOBILIZER MASTER KEY(DIAGRAM)
CONCLUSION
• The anti theft protection System immobilizer
provides a true hands-free keyless operation
experience. The encrypted communication link
between Push-Start module and Keyless Entry
modules will ensure the vehicle can only be started
with a valid access key. This system is also designed
with dual-relay protection in mind for exceptional
safety consideration. By learning about immobilizer
we gain a lot of knowledge about a new technology in
modern vehicle.
THANK YOU