Hyundai Sonata: 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. |
(2) |
When response of input transponder is not correct, input is retry. |
(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. |
(4) |
If IMMO_ECU EEPROM code is not programming, when correct transponder is inputted (CRC Check OK), input is finished. |
(5) |
After IGN1 on(CPU Reset cancellation), IMMO_ECU is reading the maximum 5times Transponder Code |
(6) |
In the IGN1 ON&EMS_state=Lock state, when received ANKNOWLEDGE, TP is re-authenticated |
|
2. |
Transponder / IMMO ECU / EMS authentication |
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. |
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.
- |
The antenna coil supplies energy to the transponder. |
- |
The antenna coil receives signal from the transponder. |
- |
The antenna coil sends transponder signal to the IMMOBILIZER.
It is located directly in front of the steering handle lock. |
Teaching Procedures
1.
Key Teaching Procedure
Key teaching must be done after replacing a defective PCM(ECM) or when providing additional keys to the vehicle owner.
The procedure starts with a ...
Other information:
Hyundai Sonata LF 2014-2019 Owners Manual: Seat Belt Warning Light
Seat belt warning light (for driver's seat)
The driver's seat belt warning light and chime will come on according to the
following table when the ignition switch is in the ON position.
Seat belt warning light (for front passenger's seat)
The front passenger's seat belt warning light will activat ...
Hyundai Sonata LF 2014-2019 Service Manual: Timing Chain Repair procedures
Removal
1.
Turn the crankshaft pulley clockwise, and align its groove with the timing mark of the timing chain cover.
2.
Remove the timing chain cover.
(Refer to Timing System - "Timing Chain Cover")
3.
Align the timing marks of the CVVT sprockets with the upper
surface of the cylinde ...