Circuit Description

IMMOBILIZER CONTROL SYSTEM / Circuit Description
The immobilizer control system is an anti-theft device which enables the starting to be possible only when the mechanical and wireless secret codes, memorized in the Engine Control Module, and the Body Control Module (BCM) are aligned simultaneously.

The transponder (built-in the ignition key) sends unique frequency secret code signals to the BCM through Antenna coils. The BCM compares the received code signals with memorized code. When the codes are aligned, the BCM sends signals to the ECM so that the starting is possible through fuel injection control.