Originally Posted by Hans_ACS

Yes, the backpanel comes off. You need to take out 2 plugs on the underside, and then it just snaps off. These 2 pins are best replaced with new ones when you put the panel back afterwards. (cost only a few cents at the dealer).

Finally a tip : be carefull no to hurt your hand when pulling the wire through the seat.. there are some very sharp steel edges in there....