Driver auto-seat belt not moving

Drivers seat belt not moving / jammed and there are 2 things continually 'whirring'. I've only figured out one of them but they both have to do with the seat belt somehow. First one was fixed by removing a fuse but we then found out that same fuse is also the one that operates the starter and the ABS light comes on and the brakes stick... The second "whirring" is easily seen when you pop off the small oval access panel directly behind the driver's seat, a few inches above the floor in the plastic interior cover. I'm assuming this is the main motor you see when you look in there and a cap like black thing spins constantly!!! ...even with keys out of my ignition and everything off... if the door is open it will continue spinning!!! (so weird!). Looks like we might have to take entire interior plastic siding cover off to even really get in there! What a pain in the arse!