COMPONENT
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DESCRIPTION
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TRANSPONDER
(Built-in keys)
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When ignition is ON, the coil supplies energy to the
transponder, which in turn accumulates energy in the
condenser. Once the energy supplied from
the coil has stopped, using the stored energy in the condenser, the
transponder transmits the secret data. The transponder has an advanced encryption algorithm.
During the key teaching procedure, the transponder will be
programmed with vehicle specific data. The vehicle specific data are
written into the transponder memory. The write procedure is once
only ; therefore, the contents of the transpondercan never be
modified or changed.
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COIL
ANTENNA
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Supplies energy to the transponder. Receives signal from the transponder. Sends transponder signal to the BCM.
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BODY CONTROL
MODULE (BCM)
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The
BCM carries out communication with the built - in transponder in the
ignition key. This wireless communication runs on RF (Radio
Frequency). The RF signal from the transponder, received by the
antenna coil, is converted into messages for serial communication by
the BCM. And, the received messages from the ECM are converted into
an RF signal, which is transmitted to thetransponder by the
antenna. In case of "SMARTRA" type
immobilizer system the BCM does not carry out the validity check of
the transponder or the calculation of encryption algorithm. This
device is only an advanced interface, which converts the RF data
flow of the transponder into serial communication to the ECM andvice
versa.
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ENGINE
CONTROL MODULE (ECM)
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In
case of "SMARTRA" type immobilizer system the ECM carries out a
check of the ignition key using a special encryption algorithm,
which is programmed into the transponder as well as the ECM
simultaneously. Only if the results are equal can the engine be
started. The data of all transponders,which are valid for the
vehicle, are stored in the ECM.
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DATA LINK
CONNECTOR (DLC)
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By
connecting the voltmeter or Hi-scan, the control module diagnostic
code can be read.
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DIAGNOSTIC
TESTER
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Has
the function BCM, ECM, and key diagnosis and
change.
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