It's the C-pillar, actually. A, B, C, from front to back. In the coupe you have the start with the door sill trim. Then the piece then kinda goes up towards the backseat. Then pull the upholstered piece towards you. Then you can loosen the piece up on the pillar. I may have the order a little wrong, but it'll be obvious when you get into it. You can't get that piece totally off, so you just have to carefully pull it back (flip the seat back down some and I think it'll be easier). You'll see the black box in there right where the wires go in. It's just attached with one little bolt (I don't rememeber what size socket - not big). Unclip the wires and it comes right off. Then of course do everything in reverse with the new one.
