Immobilizer Control Unit (ICU)

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.

Fig 1: Identifying Immobilizer Control Unit

Courtesy of ISUZU MOTOR CO.

Pin-outs 

Fig 2: Identifying Pin-Outs

Courtesy of ISUZU MOTOR CO.

Immobilizer Coil (Antenna) 

Immobilizer coil is install in order that ICU may check the security code memorized by the transponder (key).

Fig 3: Identifying Immobilizer Coil

Courtesy of ISUZU MOTOR CO.