Immobilizer System

Circuit Operation

Immobilizer control unit (ICU) permits engine starting, when the security code which compares the security code registered into the transponder (key) and the security code registered into ICU, and is similarly registered into ICU and engine control unit (ECM) is compared and it is judged that it is normal. When the code registered into the key is unusual, and when not recognizing a security code, ICU does not permit starting of engine.