Hyundai Santa Fe: Immobilizer System / Description and operation
The immobilizer system will disable the vehicle unless the proper ignition key
is used, in addition to the currently available anti-theft systems such as car
alarms, the immobilizer system aims to drastically reduce the rate of auto theft.
1. |
Transponder (TP) – IMMO ECU Communication
TP Read Protocol
(1) |
IMMO_ECU after IGN on(or CPU Reset cancellation) is sent Challenge
to TP and confirmed Serial Number and Signature.
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(2) |
When response of input transponder is not correct, input is
retry.
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(3) |
When response of input transponder is correct, The data that
calculate Encryption operation in the EEPROM program compared
with received data from TP.
When Codes is same, input is finished.
If the codes are not same, input are continued until when codes
are same.
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(4) |
If IMMO_ECU EEPROM code is not programming, when correct transponder
is inputted (CRC Check OK), input is finished.
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(5) |
After IGN1 on(CPU Reset cancellation), IMMO_ECU is reading the
maximum 5times Transponder Code
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(6) |
In the IGN1 ON&EMS_state=Lock state, when received ANKNOWLEDGE,
TP is re-authenticated
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2. |
Transponder / IMMO ECU / EMS authentication
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PCM (Power Train Control Module)
1. |
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 Randorm 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 IMMOBILIZER unit (A)
The IMMOBILIZER carries out communication with the built-in transponder in the
ignition key. This wireless communication runs on RF (Radio frequency of 125
kHz). The IMMOBILIZER 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 IMMOBILIZER 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 IMMOBILIZER 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.
Transponder (Built-in keys)
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 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 IMMOBILIZER.
It is located directly in front of the steering handle lock.
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Diagnosis with diagnostic
tool
1.
In the body electrical system, failure can be quickly diagnosed by using
the vehicle diagnostic system (diagnostic tool)...
Other information:
Description
The photo sensor is located at the center of the defrost nozzles.
The photo sensor contains a photovoltaic (sensitive to sunlight) diode. The
solar radiation received by its light receiving portion, generates an electromotive
force in proportion to the amount of radiation received which is transferred
to the automatic temperature control module so that the solar radiation compensation
will be performed...
Removal and Installation
•
Be careful not to damage the parts located under the vehicle
(floor under cover, fuel filter, fuel tank and canister) when
raising the vehicle using the lift...