New to BMW

[Boss_man]

Hello all. I purchased a 2004 545i for my daughter. Well I was ignorant to BMW's and now I'm paying for it literally lol. I have one MAJOR problem. The car had an aftermarket radio and it has been close to impossible finding a factory head unit. Of course there are a bunch online, but every dealer I have called refused to give me a part number. I do know the car originally came with the logic 7 system with the fiber optic connection, cd changer in glove box, and navigation. Does someone have this part #? Where can I find the pin out for the factory radio harness?

Also, I was removing the aftermarket radio and apparently the terminal of the battery was touching the post (I had disconnected). Anyways, the power cable the previous owner had hooked up made contact somewhere (I don't know) Oddly, it only blew the passenger seat fuse, not the radio fuse or any other. I replaced the fuse and checked every other fuse in the glove box and trunk, all are good, but now both power seats do not work, teh radio does have power and everything else in the car also works. I have removed both seats and checked all connections, cleaned them and reinstalled the seats but no love. Once again, all fuses are good. What else could it be?