Immobilizer Control System: Description

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. SMARTRA type immobilizer
   • The SMARTRA system consists of a transponder located in the ignition key, a antenna coil, a SMARTRA unit, an indicator light and the ECM.
   • The SMARTRA communicates to the ECM (Engine Control Module) via a dedicated communications line. Since the vehicle engine management system is able to control engine mobilization, it is the most suitable unit to control the SMARTRA.
     Fig 1: Identifying Transponder Location

     Courtesy of KIA MOTORS AMERICA, INC.
   • When the key is inserted in the ignition and turned to the ON position, the antenna coil sends power to the transponder in the ignition key. The transponder then sends a coded signal back through the SMARTRA unit to the ECM.
   • If the proper key has been used, the ECM will energize the fuel supply system. The immobilizer indicator light in the cluster will simultaneously come on for more than five seconds, indicating that the SMARTRA 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 the indicator light will continue blinking for about five seconds until the ignition switch is turned OFF.
   • If it is necessary to rewrite the ECM to learn a new key, the dealer needs the customer's vehicle, all its 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.
   • The immobilizer system can store up to four key codes.
   • If the customer has lost his key, and cannot start the engine, contact KMC motor service station.
     Fig 2: Immobilizer Control System Communication Diagram

     Courtesy of KIA MOTORS AMERICA, INC.