Control unit images: store, edit and prepare writing

Where: Diagnostics › More tests › Service functions › Advanced › channel “Control unit images”

Important: Emissions tables (particulate filter, EGR, AdBlue, catalytic converter, lambda sensors, diagnostic monitors), the immobilizer, the keys, the odometer and the crash data cannot be edited or signed. This rule cannot be turned off.

1. Choose the vehicle and the module (engine, gearbox, body…). You need the permission to write to control units, the vehicle programming accreditation and PIN, Face ID or one-time code verification.
2. Upload the first read or the car's original file. It is the original copy: it stays protected and is never edited or deleted. Enter the part number, hardware, software and chassis number if you want to be able to prepare writing later.
3. Import a table definition (CSV, TSV, XDF or A2L) and give the part number of the control unit it is for. Whatever the file does not say is not made up, and emissions tables come out locked.
4. Press "Edit tables" on the copy, choose the definition and the table, and change the values. No value can go outside the table's limits. You can see them as numbers or as a graph, and undo.
5. Press "Create edited copy". A new copy is saved with its change report; the original is not touched. The declared checksums are recalculated automatically.
6. Read the report: it says which tables change, before and after, and whether the copy can be prepared for writing. If something unexplained changes or a checksum does not match, it cannot be written.

• Compare: tick two copies of the same module and press "Compare the two selected".
• Download: every download is recorded in the history before the file is handed over.
• Delete: a copy can only be deleted if nothing depends on it. The original copy is never deleted.
• A file made with another tool is uploaded saying which copy it comes from and which definition checks it: if it touches emissions tables, protected areas or unexplained bytes, it stays unsigned.
• Safety modules (airbag, brakes, steering, hybrid): only with level B confirmed, and the report marks it.

Important: Preparing the writing package (Hub only) does not write anything to the car. The Hub then signs it, and writing it needs the approval of two people, the test channel and an enrolled device, just like any manufacturer image.

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