Need info on memory seats and auto-dip pass. mirror in reverse

[TC535i]

My 540i has both of these, and neither work.

Memory seats... it has them, but they don't work. If I hit the "memory" button to "teach" it a position, it doesn't light up. Should it?

Reverse mirror... my car has the wrong mirror on the passenger side. It's an early E34 mirror, put on there by a previous owner. It's not even plugged in, since the connectors are different. I'm looking into buying replica M5 mirrors, with the motor/glass included. Here's my question... Is the reverse mirror dip function TOTALLY located outside the mirror assembly? Like, there's a brain somewhere that tells it to lower a certain amount, then allows it to return where it was once you're out of reverse? Or would the motor matter in this case? Will this function still work with the knockoff mirrors?

Any info you guys have on these would be great... along with figuring out why my radio displays on the dash and my OBC doesn't, and a couple other issues with the new car...

-Tim