Yes the Dension will allow you to code in the CD Changer. I've had my Dension for a couple of years, and recently removed my Nav and CD Changer from the frunk.

I still get CD Changer and Nav errors on startup, even though Nav is coded out. Dension works although doesn't display song info properly and won't remember the previous audio source. Frustrating. Running the latest Dension firmware.

Best place to install is behind the PCM.