Immobilizer Control System: Description

Fig 1: Identifying Immobilizer Control Module

Courtesy of HYUNDAI MOTOR CO.

The immobilizer system is an anti-theft device which enables starting to be possible only when the mechanical and wireless secret codes are aligned simultaneously. The transponder built in the ignition key signals its unique frequency code and at this time the ICM compares it with the memorized code.

When the codes are aligned, the ICM sends signals to the ECM so that starting is possible.

1. ICM: Immobilizer Control Module
2. ECM: Engine Control Module