Description
Citroen Saxo KM Calibration 1.0 — service tool for NEC-780826-GC dashboards 
Compact Windows utility that communicates over a standard COM port to set a calibrated mileage value on Citroen Saxo instrument clusters based on the NEC-780826-GC MCU.
What it does
Typical use cases
Quick start
Compatibility
Tested on Windows 10 LTSC (2019). Also runs on Windows 7 / 8 / 10 / 11 (x86/x64).
Minimum system requirements
Best practices
Legal notice
This tool is for legitimate service tasks only (module repair/replacement and restoration of accurate data). Regulations may apply in your region — ensure full compliance and proper documentation.
Disclaimer
Details are based on the provided screenshot and public information 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.
Compact Windows utility that communicates over a standard COM port to set a calibrated mileage value on Citroen Saxo instrument clusters based on the NEC-780826-GC MCU.
What it does
- Direct write — enter a new KM value and press Write KM.
- Serial connection — simple Open COM port / Close COM port workflow.
- Focused target — designed for Saxo clusters with NEC-780826-GC electronics.
- Lightweight — portable EXE, ideal for quick bench jobs after cluster repair/replacement.
Typical use cases
- Restoring correct mileage after EEPROM/MCU corruption
- Preparing a replacement cluster for the same vehicle
- Workshop service after instrument panel refurbishment
Quick start
- Connect your interface and select the correct COM port in the drop-down list.
- Click Open COM port, enter the New KM value.
- Press Write KM and wait for confirmation.
- Click Close COM port and verify the value on the bench/vehicle.
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: <50 MB free
- Extras: Serial/USB-COM interface, stable 12 V bench power
Best practices
- Keep a verified backup of the original data when possible.
- Use a battery support/bench supply to avoid voltage dips during writing.
- Tool is intended for Saxo NEC-780826-GC clusters; other dashboards are not guaranteed.
Legal notice
This tool is for legitimate service tasks only (module repair/replacement and restoration of accurate data). Regulations may apply in your region — ensure full compliance and proper documentation.
Disclaimer
Details are based on the provided screenshot and public information 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.
