Help with Navigation Please!
 

Not sure if this is the correct category but I'll start here. I just installed a Pioneer BEH6600BT head in my Ranger. Installation went OK and I was able to pair my Iphone 5 successfully. I am able to make and receive calls through the BT, text and get texts, check emails etc.

When I ask to navigate, Siri takes the information and does the navigation, but as soon as this starts, the sound no longer comes out of the radio, only the Iphone.

If I plug the Iphone into the USB port, the navigation works properly and breaks into the music with the verbal turns, etc.

Any ideas would be appreciated!