Question regarding the combination instrument and Immobox login

Hello everyone,

I have a very specific question. I recently bought a speedometer on **** at a low price, but unfortunately, like many others, I'm now facing the problem that there's no login code.

Okay, there are various programs or adapters available that can read the login code from a speedometer, or that can modify data from the immobilizer or change the mileage. Now, I'm facing a second problem: the new speedometer displays 123,889, while the vehicle's actual mileage is 92,948 kilometers.

I already have quite a bit of CAN equipment here, so I can also program things myself using an Arduino, Beaglebone, or BananaPI.

I'm just missing information on how these devices read the login codes or how they cause the instrument cluster to write the mileage.

Is the Flash/EEPROM being read and rewritten, or are direct CAN commands used for these operations?

By the way, it's a Touran model year 2011.

It would be great if someone could give me some information about how something like that even happens .

Best regards,
Daniel.

Since the mileage reading serves as a theft deterrent, it cannot be rewritten via the CAN bus. Normally, the engine control unit (ECU) learns the mileage and vehicle identification number (VIN) when it is installed, and in such cases, the higher value is always adopted.

So, you'll need to access the EEPROM or flash memory, and then, after installation, you'll need to have the instrument cluster programmed by a workshop.

Hello,

Thank you for the information, but are there any documents that explain how to instruct the speedometer to send its EEPROM data via CAN, or are there any VW CAN commands that would cause the control unit to send its EEPROM data? Or how exactly does that work?

Regards,
Daniel.

If you know of a tool that can do this, the easiest approach would likely be to listen to the associated communication and then replicate it.

Best regards, Rainer.