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Biometric immobilizer is a controlled unit protecting a motor vehicle against unauthorized use or allows the access of a motor vehicle by the rightful owner.

US Patent No. 5,675, 490 entitled"Immobilizer For Preventing Unauthorized Starting Of A Motor Vehicle And Method For Operating The Same" discloses an immobilizer including a test unit, control devices connected through a data line to the test unit, and at least one ignition key having a transponder. When the ignition key is actuated, the test unit transmits a request signal through the data line to all of the control devices, which respond thereto by transmitting back identification codes which are compared with desired codes. The test unit prevents starting of the motor if less than a prescribed number of control devices reply with their identification code.

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