The slip ring needs to be changed or they cannot plug in the 2 wire harness for the heater. There should be a fuse at position 29 and a green relay installed. No reprogram required. The dealer should be able to do this as we owners worked it out a long time ago!
Check out this article:
http://xoutpost.com/pdf/Heated%20wheel%20retrofit.pdf

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2021 X5 xDrive40i
2015 X5 xDrive35i MSport
(Traded) 2013 X5 xDrive35i