Electronic Repair Blog

Mercedes EZS (EIS – Electronic Ignition Switch)

4/9/2023

Mercedes-Benz is renowned for its innovative and advanced technologies, and the EZS (EIS – Electronic Ignition Switch) is no exception. This electronic component has replaced the traditional mechanical ignition switch, providing drivers with added security and convenience. In this article, we will delve into how the Mercedes EZS works, its versions and types, and the various key types that it supports.

What is Mercedes EZS?
The Mercedes EZS is a crucial electronic component that is part of the vehicle's immobilizer system. It provides access to the vehicle's electronic systems and starts the engine. The EZS is a critical part of the vehicle's security system, preventing unauthorized access to the vehicle.

How does Mercedes EZS work?
The Mercedes EZS communicates with the engine control unit (ECU) and the electronic key to start the engine. The EZS receives a signal from the electronic key, which is then verified by the ECU. Once the key is authenticated, the EZS sends a signal to the ECU to allow the engine to start.
The EZS also contains a microprocessor that stores essential information about the vehicle's immobilizer system, including the vehicle's VIN (Vehicle Identification Number), the electronic key's code, and codes for other electronic components.

Versions and types of Mercedes EZS:
Mercedes EZS comes in different versions and types, depending on the model and year of the vehicle. The most common types are the W202, W203, W209, and W210.

W202:
The W202 is the first version of the Mercedes EZS and is used in the C-Class models produced between 1993 and 2000. It has a single chip that stores the vehicle's immobilizer system information.

W203:
The W203 is used in the C-Class models produced between 2000 and 2007. It has two chips that store the vehicle's immobilizer system information.

W209:
The W209 is used in the CLK-Class models produced between 2002 and 2009. It has a similar design to the W203 but with additional features.

W210:
The W210 is used in the E-Class models produced between 1995 and 2002. It has a single chip that stores the vehicle's immobilizer system information.

Types of Mercedes EZS keys:
Mercedes EZS supports various types of keys, including mechanical keys, infrared keys, and smart keys.

Mechanical keys:
Mechanical keys are the traditional keys used in older Mercedes models. They require manual insertion into the EZS to start the engine.

Infrared keys:
Infrared keys are used in newer Mercedes models and communicate with the EZS wirelessly. They require the key to be in close proximity to the EZS for the engine to start.

Smart keys:
Smart keys are the latest type of Mercedes EZS keys and contain a microchip that communicates with the EZS wirelessly. They can be used to lock and unlock the vehicle, start the engine, and perform other functions remotely.

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