Thanks Crystalworks.
My head is overheating lol. I found this website and emailed the owner to see if he has any ideas
https://www.bmwgm5.com/FZV_Antenna_Amp.htm
His response:
The remote keyless only cares about N8.
Also as far as I remember, I didn't have the radio in the car when the remote key was working fine.
I'm really curious and determined to figure this one out now.