I don't know anything about your module, and you may know what I'm going to tell you already, but I'll throw out some general info that may help you figure it out.
All adapters of this sort work by emulating the OEM CD changer interface, thus if you did have the changer, you would have to abandon it. Even without the changer, you have two connector cables under the center storage cubby, a 6 wire audio going to the head unit and a 3 wire power. Most modules connect to these cables. With DSP systems, though the 6 wire is still in place, the CD changer connects directly to the amp via a coaxial digital cable. DSP modules connect to this coax or directly to the amp.
So you need to connect your module to the 3 wire power and to the coax/amp if you have DSP, otherwise to the 3 wire and the 6 wire for non-DSP. If one of these schemes doesn't work, you'll need to contact BSW.
If you're stuck on a particular issue or step, asking a specific question will probably get you a better response. General, non-specific questions are harder to answer. Good luck, the hardest part should be locating the cables and fishing them out.