Hi Dave
Great article and video on this subject.
I am looking into this as an upgrade project to work with the iDrive function and have seen all the messages in this thred and am trying to get "Switch unit - 61 31 9 146 642 - No Seat Heating and No Stop/Start" part second hand as the £300 for a new one seems exhorbitant! I have found one on eBay for £150 that has the stop start function that my car does not have, is it possible to use that switch unit and blank the button?
Also as I am not that hands on with these things, if I source all the parts is there anyone in the Essex (+75miles) area that you could recommend to do the install?
Thanks John