I'm having the same issue: The CD-BTB200 and AVIC D3 are muting the voice dialing prompts from my Motorola RAZR V3m (Sprint) to nearly inaudible levels. If I turn the AVIC volume all the way up to maximum, I cann just about BARELY hear the voice prompts -- their so faint, I almost think they're coming from the bluetooth box behind my dash (directly) and not the speakers (haha).
The phone *is* hearing me and asking me things ("did you say 'Call Jim" or whatever), but the prompts are just not audible.
Once a call starts, the ringing and conversation volume is fine and everything works great.
The phone is otherwise working great with the AVIC (e.g., phone book totally transferred in one shot, no other issues, sound is great, etc.). Even for voice dialing here, it *IS* properly having its voice dial mode activated when I touch the "Voice" button on the AVIC's touchsceen.
Here's a post online where a guy says he has the same issue, and that he called Pioneer -- who told him this is a known issue, but that they really don't have any plans on fixing it or issuing a software fix:
http://www.fifthelectron.com/ItemB000MY72F0.aspx
So, I have to physically pick up my phone and look (while driving) to see if my cell phone properly guessed who I asked to call, or if it's asking me something else!!!