ECM/PCM (Engine Control Module/Powertrain Control Module)
The BDC (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.
* EMS NO REQUEST
While the ignition switch is ON, the ECM/PCM receives information from the BDC (IMMOBILIZER + BCM + TPMS) and permits fuel injection by confirming that the CODE memorized in the ECM/PCM coincides with the one in the BDC (IMMOBILIZER + BCM + TPMS).
Once the ID code from a transponder is verified by the BDC (IMMOBILIZER + BCM + TPMS) and registered, an answer signal will be sent to the ECM/PCM. The BDC (IMMOBILIZER + BCM + TPMS) then sends a START or NO START signal to the ECM/PCM.
* IMMOBILIZER LOCK
The Immobilizer can lock itself (Lock Mode) when all conditions are met. In the Lock Mode, a driver cannot start the engine for 1 hour. Also, DTCs cannot be cleared by GDS.