Just re-read your first reply on this thread and wondering if you have a new canbus gateway or just the canbus adapter that comes with the unit?? This is a newer unit (production starting circa 2011) so a lot of the functions are programmed to work with the newer mk6 canbus gateway. The adapter that it comes with will integrate some of the features from the mk5 golf (mfsw, mute etc) but some wont be supported by our bus.
I'm in the process of ordering a newer gateway which should give me all of the functionality available. Will update once it's all done