Xentry StartKey Generator 2020: A Guide to Coding Your Mercedes-Benz

Coding your Mercedes-Benz allows you to customize various vehicle settings, similar to adjusting settings on a computer. This guide outlines the process, focusing on utilizing a Xentry StartKey Generator for access. While finding step-by-step instructions can be challenging, this comprehensive guide will equip you with the necessary knowledge.

Prerequisites for Mercedes-Benz Coding

Before diving into coding, gather the following essential tools and software:

• Mercedes-Benz Vehicle (2005-Present): This guide focuses on newer models compatible with Xentry diagnostics.
• J2534 Pass Thru Adapter: This device connects your laptop to the vehicle’s OBD-II port. Various options are available, ranging from budget-friendly to high-end professional tools. The Tactrix Openport 2.0 is a recommended choice for beginners. Ensure the adapter has Windows 10/11 x64 drivers and Pass Thru library software.
• Xentry Pass Thru: The official Mercedes-Benz diagnostic software for mechanics. While officially expensive, many independent mechanics and hobbyists obtain it through alternative channels. There are two versions: XDOS (for older vehicles) and Pass Thru (for newer vehicles using J2534 adapters). This guide focuses on Xentry Pass Thru.
• Vediamo (v4.2.2 or later) or DTS Monaco (v8.16 or later): Advanced diagnostic and programming software used by developers. DTS Monaco is the newer, more powerful option. Choose one of these software packages for variant coding.
• Seed Key Calculator (MBSeedKey): A free, open-source application used to generate start keys for accessing protected coding functions. Download the latest release and ensure you also obtain the required DLL files, typically found through online searches. Place the DLLs in the correct subfolder within the MBSeedKey installation directory (e.g., /lib/ or /dlls/).
• Laptop (Windows 10 or 11): A 64-bit Intel/AMD CPU, 8+ GB RAM, and a 100+ GB SSD are recommended for smooth operation.

J2534 Pass Thru Adapter Selection

Any J2534 adapter with compatible Windows drivers and Pass Thru software will work. DoIP (Diagnostics over IP) adapters, while powerful, are not required for basic coding.

Software Installation and Configuration

1. Install and Activate Xentry Pass Thru: Follow online guides for activation.
2. Install J2534 Adapter Drivers and Pass Thru Library: Use the software provided by the adapter manufacturer.
3. Install and Activate Vediamo or DTS Monaco: Again, consult online resources for activation instructions.
4. Install MBSeedKey: Place the necessary DLL files in the correct directory.
5. Configure Vediamo for J2534: Edit the slave.ini file (typically located in C:Program Files (x86)VediamoCaesardriver) under the [PartJ] section. Change the DeviceName value to match your J2534 adapter’s name, which can be found in the Windows registry or by observing the Xentry Pass Thru driver selection dialog. Run Vediamo and update “Part J” to apply the changes.

Vehicle Preparation and Control Unit Identification

1. Connect your laptop to the vehicle’s OBD-II port using the J2534 adapter.
2. Turn the car’s ignition to the “ON” position (without starting the engine). Do not press the brake pedal. This ensures communication with the vehicle’s ECUs.
3. Identify the Control Unit: Launch Xentry and navigate to Diagnosis. Search for “Motor electronics … for combustion engine …” to locate the Main Engine ECU. The “Control unit variant” will identify the specific ECU module (e.g., MED40). This name is crucial for later steps.

Variant Coding with Vediamo (Example: Disabling Start/Stop)

This example demonstrates disabling the Start/Stop ECO function.

1. Launch Vediamo and Load the CBF File: Open the “Ecoute” application and select the appropriate CBF file corresponding to your ECU from the Xentry directory (e.g., C:Program Files (x86)Mercedes-BenzXentryMB_PKWCaesarcbf). Choose the specific file for your ECU variant (e.g., MED40).
2. Configure ECU Communication: In Vediamo, right-click on your ECU and select “Properties.” Change the connection to the appropriate option ending with “HSCAN_UDS_500.”
3. Initiate Contact and Variant Coding: Click “Initiate ECU Contact.” Then, select “Code the variant of an ECU.” In the “Variant Coding” dialog, find “VCD_Implizite_Variantenkodierung.” Locate the “Betriebsstrategie Stopp Start” parameter and change its value to “Stopp Start Standard Logik, Last Mode” to disable Start/Stop.

Obtaining Access Level with Xentry StartKey Generator 2020

Variant coding often requires elevated access levels. This is where the Xentry StartKey Generator (MBSeedKey) becomes essential.

1. Request Seed Key: In Vediamo, go to “ECU” -> “Manual Command Input…” and send the request “27 0B” to the ECU. The ECU will respond with a seed key (e.g., “67 0B BF DF 6F 37”).
2. Generate Start Key: Open MBSeedKey. Select the correct DLL file corresponding to your ECU. Choose access level “0B.” Enter the seed key provided by the ECU and click “Generate Key.” This will produce the required start key.
3. Unlock Access Level: Return to Vediamo’s “Manual Command Input…” and send “27 0C” followed by the generated start key. A successful response of “67 0C” indicates access level granted.

Applying the Coding Changes

1. Retry the Variant Coding process. With the necessary access level, the coding should now be successful.
2. Save and Apply: Save the modified coding data. Perform a hard reset on the ECU by finding the “FN_HardReset” function in Vediamo and executing it. This ensures the changes are applied.

Conclusion

Coding your Mercedes-Benz can unlock a range of customization options. Using a Xentry Startkey Generator 2020, alongside the proper software and procedures, grants access to advanced coding functions. Remember to proceed with caution and thoroughly research any coding changes before implementing them. Incorrect coding can potentially lead to vehicle malfunctions. This guide provides a foundation for understanding the process, but always prioritize safety and responsible coding practices.