I have found my mistake!
I'm glad it actually was something stupid ^^
I did test it with and without 48V connected in the past, but apparently I neglected to connect the two GNDs (power and signal GND) together.
I did now and the behaviour changed completely.
It now draws 250mA instead of 11, goes ...

I'm not sure if I can send it, but I can send you a PM, I guess.
I didn't see any obvious wakeup message in there, but I don't have have an eye for such things yet ^^"
I did try a few message IDs listed in there tho, that could have something to do with "ignition" etc, but not on all baud rates.

If ...

Alternatively, I'd be super grateful for a CAN dump of the CAN-L bus communication between the CPC and BSG. If somebody happens to have (access) to one of the following cars and could capture a dump, that'd be really great. (I can also provide some more detailed information once required)

grafik ...

Hi there, (I hope I'm posting this in the right topic)

I recently acquired a 48V belted starter generator (BSG) out of a mild hybrid Mercedes for cheap.
The main goal I have right now is driving it as a motor (ideally with recuperation).
I've already made some progress, but need help now, as I'm ...