Not to thread jack but.... My dad is having a related issue with his 92? M42 318i. He changed a fuse and all the doors locked and he can't them open. Keys are locked inside and he even managed to get a hook around the button for the lock nd pull it up but it still doesn't do anything. Sorry not thread jacking ur thread hear just didn't want to make a new thread lol
Sorry I can't help you cc
good luck though