Genuine OEM Mercedes-Benz Ignition Lock Module, part number A4479001703. This module is a key component of the vehicle's ignition system, responsible for authorizing and initiating the engine start sequence. It works in conjunction with the key or keyless entry system to ensure security and proper operation. The module contains electronic components that communicate with the vehicle's immobilizer and engine control unit. Genuine OEM ignition lock modules are precisely calibrated and programmed to ensure secure and reliable engine starting, preventing unauthorized use.