Seats Beeping in SL320
I have noticed on my SL320 that when you operate the car and the seats are not in the proper position, it alarms you with a beep. I would start by moving the seat completely forward, and folding it up. Look for the switch notifying the system that the seat is in the down position. I think that when you removed the seat covers one of the elastic straps may have hit your switch and corrupted it. Good Luck.