I have the retrofit cable, but would rather not take off the airbag etc again, because it could possible scratch the newly painted parts 
So my extra question is: Do the buttons usually work straight away or do you have to get the software switched on at a specialist or dealer?
If they should work without software changes, then I will probably need to put in the cable.

So my extra question is: Do the buttons usually work straight away or do you have to get the software switched on at a specialist or dealer?
If they should work without software changes, then I will probably need to put in the cable.