I was reading out of curiosity retrofits, and there wasn't a clear answer. It's still obviously a BMW problem that the dealer you got it from should take up with bmw NA. Ultimately they would have to be reimbursed from BMW NA since they built the car. Someone in older 2014 posts (when touch first came out) Said some dealers quoted $700 for parts, but was not sure if coding was needed. From what I can see, the controller is one piece and around $350 (maybe more from BMW) The question is if your idrive hardware is all compatible, and they just put in the wrong knob and is missing a wire... or if you're missing a lot more hardware.
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