System Block Diagram

Fig 1: System Block Diagram

Courtesy of HYUNDAI MOTOR CO.

When the key is inserted in the ignition and turned to the ON position, the immobilizer antenna unit sends power to the transponder in the ignition key. The transponder then sends a coded signal back through the immobilizer antenna unit to the ECM/PCM.

Fig 2: Immobilizer Control System Communication

Courtesy of HYUNDAI MOTOR CO.

• The immobilizer system can store up to four key codes.
• If it is necessary to rewrite the ECM/PCM to learn a new key, the dealer needs the customer's vehicle, all its master keys and the Hi-scan(pro) equipped with an immobilizer program card. Any key that is not learned during rewriting will no longer start the engine.
• If the customer has lost his key, and cannot start the engine, contact Hyundai-motor service station.
• If the proper key has been used, the ECM/PCM will energize the fuel supply system. The immobilizer indicator light in the gauge assembly will simultaneously come on for about two seconds, then go off, indicating that the immobilizer antenna unit has recognized the code sent by the transponder.
• If the wrong key has been used and the code was not received or recognized by the ECM/PCM the indicator light will come on for about two seconds, then it will continue blinking until the ignition switch is turned OFF.