Not an expert on this, but maybe someone with more knowledge will correct me or it is already helping you out a bit.
As far as I am aware there are two CAN busses on these models. One for the powertrain and one for the comfort / hvac stuff.
On the cluster:
Yellow: CAN comf high
Black: CAN comf low
Blue/White: CAN antrieb high
Gray/White: CAN antrieb low
ABS is on CAN antrieb
DME / ECU is on CAN antrieb
Tiptronic is on CAN antrieb
Radio is on CAN comf
Clima is on CAN comf
It looks like the CAN antrieb wire colors are also used for other functions in the engine wiring loom.
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