@PJ_Glasso:
I don’t see where I didn’t provide a solution. The link to the German blog page provides a full solution exactly as the thread-owner needs it:
- same vehicle (Fiat Ducato), both (thread-owner and the blog person) are from Europe (as Fiat Ducato sells under other brands outside Europe, e.g. RAM in the US),
- status of door locks,
- low-speed CAN,
- read-only CAN,
- IDs of all CAN messages,
- schematics,
- one possible (among 5-8 different) locations where to access the low-speed CAN signals in that vehicle type.
I even had some doubts initially to post that answer as the thread-owner and blogger both share the same first name and might have been the same person. However, the German page shows a lot deeper understanding of the problem and solves all issues including selection of the right PHY chip TJA1055T/3 of which he claims (in the comments) that after he had finished his project still has a few left over to share (something the thread-owner would clearly not).
Worth noting, that blog page also tells how to hack connecting to low-speed CAN with a high-speed PHY (thanks to the fault-tolerant design and getting along without a full ISO 11898-3 compliant PHY), if the application needs only read access to CAN (see thread-owners intent). And it shows how to pivot-select the right CAN messages, which the thread-owner doesn’t need anymore as the vehicle-specific ID coding is presented on that blog page as well.
About my “harsh” assumptions: I’m only impressed about 10 answers being posted with not providing any solution close to the thread-owners original intent and this being a deep tech-centric forum. The 11th answer at least details what low-speed CAN means and refers to some web pages with limiting details (missing are e.g. fault-tolarance schemes, voltage levels, termination per wire and node, etc.). In contrast, a simple web search for “fiat ducato low speed can” finds the cited blog page. I made up the search terms now as I knew the blog post already for a while.
Best regards,
Stephan