I have this after market head uint...AVIC-F900BT - In-Dash Navigation AV Receiver with DVD Playback and Built-In Bluetooth | Pioneer Electronics USA
I can make calls via bluetooth but I cannot play my music from my Lumina 920. When I play music it comes out of the phone's speaker. Anyway to get this to work to have music play via bluetooth?
As long as it supports BT audio, then yes, it should work. Chances are after pairing the phone you need to change the audio source on the stereo to "Aux" or BT" channel. It likely doesn't happen automatically when you pair the phone.
You may want to get a hold of Pioneer's support group or their forums to see how you can do it.