The Dension mimics (or replaces) the CD changer [not CD player] to get it to operate (mostly correctly). Need to make sure changer is set to active in the CDR23 first AND ensure the Dension control box is NOT in bypass mode so check the switch too (on Dension unit or remote cable).
FYI - even if you do get it activated to work for music, you will need the additional bluetooth module to make it work w/ the 'phone' portion of your phone... I put one in my 2006 997 C2S but it's been gone for a couple years so I forget all the nuances...
Good luck
