Audi MM 1.1 — service tool for Magneti Marelli MM4 (HC912) clusters
A compact Windows utility designed for workshops working with Audi Magneti Marelli MM4 instrument clusters based on the HC912 MCU. Load an EEPROM/MCU dump, view the Old km, enter the New km, and save a corrected file with checksums handled automatically. The tool also displays the Immo PIN extracted from the dump to speed up coding and adaptations.



Key features

• MM4 (HC912) support — targets Audi clusters that use the Magneti Marelli MM4 platform with HC912 MCU.
• Odometer service workflow — reads current odometer value and lets you set a calibrated new value.
• Auto checksum — integrity bytes are recalculated on save to prevent error messages on power-up.
• Immo PIN readout — shows the immobilizer PIN from the file for quick key/cluster procedures.
• Simple UI — Open → Set new mileage → Save. Lightweight and portable for bench work.

Typical use cases

• Cluster refurbishment or replacement after hardware repair
• Restoring correct mileage following memory corruption
• Preparing a used cluster for installation in the same vehicle

How to use (high-level)

• Read the cluster’s EEPROM/MCU with your programmer and save the dump.
• Open the file in Audi MM 1.1; verify the displayed Old km and note the Immo PIN if needed.
• Enter the New km value and press Set new mileage.
• Click Save to write a corrected file; program it back to the cluster and verify.

Compatibility
Tested on Windows 10 LTSC (2019). Also runs on Windows 7 / 8 / 10 / 11 (x86/x64).

Minimum system requirements

• OS: Windows 7 or newer (32/64-bit)
• CPU: Dual-core 2.0 GHz+
• RAM: 2 GB (4 GB recommended)
• Storage: under 50 MB free
• Extras: EEPROM/MCU programmer, stable bench power supply

Best practices

• Always back up the original dump and keep a verified copy.
• Use stable power during read/write; verify on the bench before installation.
• Tool focuses on Audi Magneti Marelli MM4 (HC912); other clusters are not guaranteed.

Legal notice
This software is intended for legitimate service tasks (module repair/replacement and restoration of accurate data). Misuse may be illegal in your region. Ensure all work complies with local laws and customer documentation.

Disclaimer
Information is compiled from the provided screenshot and public knowledge for educational/archival purposes. Any files, if referenced, are hosted by third parties; our forum does not host or distribute software and is not responsible for external content.