Re: Triggering the diagnostic CAN bus (Volkswagen) | Posts 16+

ich hoffe das ich mein buch bis ende nächster woche habe.
'What's unfair about the whole situation is that I spent over 100 hours figuring out the basics of K-line and TP 1.6, and analyzing various data points from MotorCAN. I learned how the individual control units work and how to perform firmware updates on them. However, the use of seed & keys isn't documented or explained.'?'What's unfair about the whole situation is that I spent over 100 hours figuring out the basics of K-line and TP 1.6, and analyzing various data points from MotorCAN. I learned how the individual control units work and how to perform firmware updates on them. However, seed & key usage isn't described or explained.'

How the individual control units function and how to perform firmware updates on control units is described, but the use of 'seed & keys' is not mentioned or explained.

That would probably be too specific to the manufacturer for the book. However, chapter 5.1.2 does indeed cover seed and key exchange. The process of exchanging information is generally explained, but then it refers to the manufacturer (the lengths of the seed and key values, and the calculation algorithms used, are not part of KWP2000).

I now have the book as well. It's an interesting read, and the €40 was worth it, but I'm missing a chapter, which is kwp1281 (no, ISO 9141-2 is not kwp1281). Also, it would have been nice to have more VW-specific content and ready-made source code examples. But you can't have everything.

Did you receive my email, @frogger?

I now have the book as well; it's an interesting read, and the €40 was worth it. However, I am missing one chapter, which is kwp1281 (no, ISO 9141-2 is not kwp1281). Also, a little more VW-specific information and ready-made source code examples would have been nice but you can't have everything.

@frogger Did my email arrive?

kwp1281? Is that a very recent protocol or an older one? I think UDS will eventually replace KWP2000 in new vehicles.

P.S.: Email sent.

kwp1281 is the protocol used by most Golf 4 engine control units (ECUs) for diagnostics via K-line.

As far as I know, the latest Audi models already have UDS (Unified Diagnostic Services) integrated. There's also a beta version of VAGCOM that supports these features.