1994 740il issues...HELP!

I need help on 2 things....First my diver seat is only moving the right side of the seat, which means the left and stable and the seat is twisting. You van hear the battery moving but the entire seat is not moving like it should. What to do to fix this? Second, all of a sudden my radio went out. It is beeping as if to say the alarm is on. I got my battery checked, since I was told that a low battery could be the problem. But the battery and alternator are fine. What can be done to get the radio on and working again? Thx 4 help!