You never knew you need them till you have them.Pardon me but what is the foldable chromatic mirror?
Bad news for me thenSounds like the "low" version of the mirrors have more wires because they use traditional electrical switches for all the mirror-related controls. Whereas the "high" version of the mirrors (presumably, the power-folding, auto-dimming version) use the LIN-BUS to control all of the functions. This makes sense since the auto-dim function is driven by the interior rearview mirror, etc. I'm guessing this is much more than a simple coding difference. I'm willing to bet that the control module(s) that are involved have different wiring outputs, so you'd have to do a rewire at the mirrors and at the control module to which they're hooked, and then do the necessary coding to fully enable all of the functionality. Also, I'm 99% certain that the auto-dimming interior rearview mirror is required for the exterior mirror to auto-dim. This is just based on my prior experience fitting things after-the-fact on my previous BMW.
It is possible to do this (and easy, no extra wiring), you have to change driverside switch, you need to change 3 wire’s in the driverside switch plug and you need a bit off coding, this can be done with bimmercode and a wifi obd plug.