Description and Operation

Description

The immobilizer system disables the vehicle if the correct ignition key is not used. In addition to existing anti-theft systems, such as the car alarm, the immobilizer system is designed to sharply reduce the number of vehicle thefts.

1. SMARTRA Type Encrypted Immobilizer
   • The SMARTRA system consists of a passive challenge-response (mutual authentication) transponder located in the ignition key, an antenna coil, a SMARTRA control unit, an indicator light, and the PCM (ECM).
   • SMARTRA communicates with the PCM (ECM) (engine control module) via a dedicated communication line. Since the engine control system is capable of controlling engine immobilization, this is the most suitable device to control SMARTRA.
   • When the key is inserted into the ignition switch and turned to the ON position, the antenna coil sends power to the transponder in the ignition key. The transponder then sends an encoded signal back through the SMARTRA unit to the PCM (ECM).
   • If the correct key was used, the PCM (ECM) will enable the fuel supply system. The immobilizer indicator in the instrument cluster will illuminate for more than five seconds at the same time, indicating that the SMARTRA unit has recognized the code sent by the transponder.
   • If an incorrect key is used and the code is not received or recognized by the PCM (ECM), the indicator will continue to flash for about five seconds until the ignition switch is turned off.
   • If it is necessary to rewrite the PCM (ECM) to learn a new key, the dealer needs the customer's vehicle, all of its keys, and a GDS equipped with the immobilizer program card. Any key that is not learned during the rewrite will no longer start the engine.
   • The immobilizer system can store up to eight key codes.
   • If the customer has lost a key and cannot start the engine, contact a Hyundai service center.

Components and Operation

PCM (Powertrain Control Module)

1. The PCM (ECM) (A) verifies the ignition key using a special encryption algorithm that is programmed into the transponder and the PCM (ECM) simultaneously. The engine can be started only if the results match. The data of all transponders valid for the vehicle are stored in the PCM (ECM). The ERN (encrypted random number) value is exchanged between the EMS and the SMARTRA device, and the validity of the encrypted key is determined by the EMS. [3.3 Gasoline]

   

SMARTRA ENCODED UNIT (A) SMARTRA communicates with the transponder built into the ignition key. This wireless communication operates at radio frequency (125 kHz RF). SMARTRA is mounted behind the crash pad garnish next to the center crossmember. The RF signal from the transponder, received by the antenna coil, is converted into serial communication messages by the SMARTRA unit. Messages received from the PCM (ECM) are converted into an RF signal, which is transmitted to the transponder by the antenna. SMARTRA does not perform transponder authentication or encryption algorithm calculation. This unit is only an advanced interface that converts the RF data stream from the transponder into serial communication with the PCM (ECM) and vice versa.

TRANSPONDER (built into key) The transponder (A) has an advanced encryption algorithm. During the key learning procedure, the transponder is programmed with vehicle-specific data. The vehicle-specific data is written to the transponder memory. The writing procedure is performed only once; therefore, the contents of the transponder can never be modified or changed.

Antenna Coil: The antenna coil (A) performs the following functions.

• The antenna coil supplies power to the transponder.
• The antenna coil receives the signal from the transponder.
• The antenna coil sends the transponder signal to SMARTRA. It is located directly in front of the steering column lock.