The DAS System in DAS3: A Comprehensive Overview

The DAS system, or Driver Authorization System, is a vital component of modern Mercedes-Benz vehicles. It uses advanced technology to ensure that only authorized drivers can start the engine and access various features of the vehicle. In this article, we will provide a comprehensive overview of the DAS system in DAS3, also known as the W221 or W216, including its components, common failures, and fault codes.

DAS System Components
The DAS system in DAS3 consists of several critical components that work together to provide advanced security and convenience features. These components include:

• Electronic ignition switch (EZS): This component is the heart of the DAS system and contains essential information about the vehicle's immobilizer system.
• Electronic ignition lock (EIL): The EIL works in conjunction with the EZS to ensure that only authorized keys can start the engine.
• Steering lock module (ESL): The ESL locks the steering wheel in place when the vehicle is parked and unlocks it when the key is inserted into the EZS.
• Key fob: The key fob contains a unique code that is transmitted to the EZS when the driver presses the button to start the engine.
• SAM control unit: The SAM control unit is responsible for managing various electrical systems in the vehicle, including the DAS system.

Failures and Fault Codes
Like any electronic system, the DAS system in DAS3 can experience failures and faults. Some common failures include issues with the key fob, the EZS, the EIL, or the ESL. Fault codes can provide valuable information for diagnosing and repairing these failures. Here are some

​common fault codes and their meanings:

1. Fault code 9005: This code indicates a failure in the key fob or the key fob battery.
2. Fault code 9051: This code indicates a failure in the EZS or the EIL.
3. Fault code 9050: This code indicates a failure in the ESL.
4. Fault code 9074: This code indicates a failure in the SAM control unit.

Diagnosing and Repairing Failures
Diagnosing and repairing failures in the DAS system in DAS3 requires specialized knowledge and equipment. Mercedes-Benz dealerships and repair shops have the necessary tools and expertise to diagnose and repair these issues. Some common repair options include replacing the key fob battery, repairing or replacing the EZS, EIL, or ESL, or replacing the SAM control unit.

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