Hyundai Elantra MD/UD: Components Operations
PCM (Power Train Control Module)
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The PCM(ECM) (A) carries out a check of the ignition key using
a special encryption algorithm, which is programmed into the transponder
as well as the PCM(ECM) simultaneously. Only if the results are equal,
the engine can be started. The data of all transponders, which are valid
for the vehicle, are stored in the PCM(ECM).
ERN (Encrypted Random Number) value between EMS and encrypted
smartra unit is checked and the validity of coded key is decided by
EMS.
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ENCRYPTED SMARTRA unit (A)
The SMARTRA carries out communication with the built-in transponder in
the ignition key. This wireless communication runs on RF (Radio frequency of
125 kHz). The SMARTRA is mounted behind of the crash pad close to center cross
bar.
The RF signal from the transponder, received by the antenna coil, is converted
into messages for serial communication by the SMARTRA device. And, the received
messages from the PCM(ECM) are converted into an RF signal, which is transmitted
to the transponder by the antenna.
The SMARTRA 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 PCM(ECM) and vice versa.
[USA]
[CANADA]
TRANSPONDER (Built-in keys)
The transponder (A) 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 transponder can
never be modified or changed.
Antenna coil
The antenna coil (A) has the following functions.
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The antenna coil supplies energy to the transponder.
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The antenna coil receives signal from the transponder.
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The antenna coil sends transponder signal to the SMARTRA.
It is located directly in front of the steering handle lock.
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