Sorry to crash your Forum, as I currently don't own a GTI. Have owned 3 in the past, please ignore me if I have no right here, but I know that the contributors on this forum are very knowledgable.
Just sold my Touran and bought a Altea FR 57 plate and retro fitted a RNS315. The sets works perfectly, but not the steering wheel controls. I know that they run different protocols dap-ddm ( I think), but does anybody know of a fix? Or is this the trade off for the newer unit? Thanks in advance for your patience for a being a non VW owner asking questions.