DICE Mediabridge install question-probably been asked, but I can't find it....

[h2oskiphil]

2004 X5, no NAV, no CD changer, no DSP (although I DO have factory subs, but no DSP controls anywhere....). Business radio/CD with MID control.

Got a Mediabridge w/Bluetooth for Christmas. Installed it, and it recognizes my iPod, links up via Bluetooth and sees my music off my phone, steering wheel controls all work, display on the MID shows song titles in USB and Bluetooth modes, but I have no audio. During the install, I plugged in to the 6 pin and 3 pin connectors in the driver's side rear compartment with no issue. Talked to DICE today, and they had me check for an audio signal at the 6 pin connector coming out of the DICE module (the one that plugs in to the factory harness), and I've got signal there, which means that the DICE module is getting audio from the iPod and phone and sending it back to the 6 pin connector in their harness. The factory 6 pin connector only has 3 wires coming out of it (which is weird-there should be at least 4), and I traced those wires back up to the dash-they plug into my Business CD player.

What am I missing here? Based on all the pictures I've seen of installs on this, I've got the right connector going back up to the dash, but is it supposed to plug into the CD player?