My E53 just came up with these symptoms and I fear the ABS module (already fixed once) is now a terminal case. INPA indicates the CANbus is down. ISTA can't ID the car.

QUESTION: Assuming that the ABS module is indeed to blame, if I unplug the ABS module, at least the CANbus should come back up? Or will the disconnection of the ABS module also interrupt the bus lines? I.e. is this a daisy chain system or can it live with one of the CAN interfaces unplugged?

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2003 4.4i black ext./black int./black headliner (kid's runabout)
2014 535d X-drive, M package, silver/black interior

Sold but not forgotten:
2009 E70 35d, black ext./black int./black headliner (sold 2021)
2006 4.8iS Le Mans blue/cream int./black headliner, SOLD in 2012 sadly...

Other hardware:
2015 Cayenne S (wife's new DD and definitely wroooommmmm)
2016 Tundra 1794 edition crew cab, luxo hauler
2005 Tundra crew cab, weekend hauler. Sold after 150k very happy miles.