Powertrain Control Module (Engine Control Module/Transmission Control Module)
The IBU (IMMOBILIZER + BCM + TPMS), or the Immobilizer Control Unit. supplies power to the coil antenna, receives and analyses signals from the transponder, transmits signals to the engine ECM and stores VIN (Not the number on the bulkhead of vehicle but Vehicle Identification Number for Immobilizer) data comprised of an ID code and password.