How to Close Mercedes Trunk With Key: Coding Guide on W212

How to close Mercedes trunk with key is a common request among technicians and workshops working on the Mercedes W212. From the factory, the remote trunk-closing function is often disabled, requiring coding to activate it. In this guide, AutoExplain provides a clear and practical method to enable trunk closing via the key fob using Vediamo, ensuring the feature works reliably and safely on the W212 platform. This tutorial is designed to help you perform the coding correctly and avoid common mistakes during the process.

Benefits of Enabling the Trunk Closing Feature With the Key

Mercedes disables the trunk-closing function via the remote key on certain markets and trim levels for safety and regulatory reasons. In some regions, closing the trunk remotely is restricted to avoid accidental activation, especially when the user is not in direct view of the vehicle. Additionally, model configurations and equipment packages (with or without Power Trunk, Keyless-Go, etc.) affect which functions are enabled by default. Because of this, the feature remains present in the control unit but turned off at the software level—and technicians can re-enable it through Vediamo coding.

Activating the trunk-closing function on the Mercedes W212 using the remote key greatly improves convenience and practicality. It allows users to close the trunk from a distance—useful when carrying items, during bad weather, or when the vehicle is parked in tight spaces. This feature also enhances workflow efficiency for technicians or detailers who often access the trunk during service tasks. Once coded correctly, the function operates seamlessly without adding hardware, making it a clean and cost-effective upgrade through software coding alone.

Tools & Software Required when code closed truck with key on Mercedes W212

To successfully code the trunk-closing function on the Mercedes W212 using Vediamo, you will need the following tools and software:

Software

• Vediamo – Engineering software used for advanced coding on Mercedes-Benz vehicles. Required to activate hidden features such as trunk closing with the key.
• Xentry (optional but recommended) – Useful for initial diagnostics and confirming system health before coding.
• CFF/CBF Files for W212 – Correct database files to access and code the rear SAM or relevant control unit.

Hardware

• SDconnect C4 / C6 or Tabscan T6Xentry, Tabscan T6 Elite – The recommended Mercedes diagnostic interface for stable communication during coding. You can see more Tabscan Device at: Car Diagnostic Tool
• Stable Laptop – Windows-based PC with reliable USB/LAN connection.

How to Close Mercedes Trunk With Key [Step by Step Coding with Vediamo] 

Step 1: Connect Diagnostic Interface

Connect the SDconnect C4/C6 (or compatible device) to the vehicle and your PC running Vediamo.

Step 2: Load the Correct Project

Open Vediamo and choose the appropriate project for the Mercedes W212, then read the control modules.

Step 3: Select the PTCM Module

Choose PTCM (Power Trunk Control Module) and press OK to access its coding parameters.

Step 4: Perform Variant Coding

Go to the Variant Coding tab, adjust the coding values according to the required configuration, then click “Do Coding” to complete the process.

AutoExplain offers the Mercedes Master Diagnostic & Coding Guidebook, a comprehensive reference designed for technicians who want deeper control over Mercedes diagnostics and coding. Inside the guidebook, you’ll find:

• Practical coding and adaptation procedures for Mercedes platforms (W204, W212, W221, W166, etc.)
• Step-by-step troubleshooting for Xentry, DAS, Vediamo, and DTS Monaco
• Real case studies including CGW, EZS, PTCM, SAM, HU, LED upgrades, retrofits, and convenience coding
• Detailed explanations to help you avoid common risks when flashing or coding modules

This guidebook helps you work faster, reduce errors, and understand each control unit on a deeper technical level. See more at: Combo Mercedes Master Diagnostic & Coding Guidebook

If you need assistance choosing the right diagnostic tools or want more information about our guidebooks, feel free to contact AutoExplain via WhatsApp +1 (936) 289 6695 or live chat on our website.

Conclusion

Coding the close-trunk-with-key function on Mercedes W212 using Vediamo is a simple yet highly sensitive procedure. By following the correct steps—establishing a proper connection, loading the right project, and applying accurate Variant Coding in the PTCM—you can successfully unlock this convenience feature and ensure stable operation.

For technicians who regularly work with Mercedes vehicles, mastering coding procedures, understanding module structures, and handling variant adaptation safely is essential. This is exactly why AutoExplain has developed a dedicated set of technical guidebooks.