CAN Bus Search Complete? Communication Next Steps.

Hello everyone,
My search for a CAN (Controller Area Network) solution is almost complete, so I'd like to share some of the knowledge I've gained.

At Seat, the CAN bus network is different from that used by VW or Audi.
Since these vehicles have the same basic structure, it doesn't necessarily mean they function the same way. This becomes particularly evident when you look at the CAN (Controller Area Network) structure.
In my 2003 ASV model, all the wiring is configured to allow for a star network.
However, the CAN transceiver is not present on the control unit in versions without ESP and without an automatic transmission. Consequently, no termination resistor can be measured.
My control unit has software version 3357.
So, the MSG operates solely via the K-line and the analog signal lines.
Therefore, the Seat, model year 2003, functions similarly to a Golf III from 1995.
For a Golf model year 2000 with an ASV engine, this will be different. It would be interesting to know the software version and a description of the engine control unit (ECU) in this case.

what is surprising now is:
The gateway has enabled CAN for the MSG, but it doesn't detect any errors in the (non-existent) communication.
My gateway is type 6 NO 909 901. What type of gateway is used in the Golf? Is the hardware and software different there as well?
The speedometer also supports the CAN bus protocol: type 1 MO 920 802 D.
Just like the ABS (type 1C0907 379 J).
MSG and ABS are recognized as CAN participants within the gateway.

Who here knows the communication channel?
Why are these messages being generated when the CAN bus has a 0% load?

How does the radio communicate with the instrument cluster to implement speed-dependent volume control?

And what about the ComfortCAN?
Does anyone know anything about Seat?
Ideally, someone could study books related to Seat .

Best regards, Jochen.

My gateway is of type 6 NO 909 901. Which gateway is found in the Golf? Is the hardware and software different here as well?

The 1J0 920 822, 3B0 920 845 A, 7M5 920 820 Q, 1M0 920 802 D, and 1J5 920 845A X all have the 6N0 909 901, just like 99% of all 920 series speedometers.