I've just bought a new car (2015 Honda Fit) which has a decent size LCD panel in the dash (but I opted not to get the expensive navigation system) and which also has full bluetooth integration and, surprisingly, an HDMI port for the screen. HDMI is one of the "source" settings, and Bluetooth is a separate one.
I've paired my Nexus 5 to the car in order to take and make phone calls and get the other integration features such as music and podcast playback over the car's audio. I had this idea that if I were to run the Nexus 5 through the large screen using HDMI (via a Slimport adapter), I can have a much nicer Google Maps based navigation system that would give something close enough to the experience of the in-dash nav system minus the touchscreen -- which is fine, as I can set the route, put the phone in a cupholder, and not bother with it again.
Now, here's the fatal snag. While the phone is paired to bluetooth, it insists on sending 100% of its audio through Bluetooth and doesn't send it through HDMI. The car is either-or on the sources. If it's on HDMI, it only plays back HDMI. The screen displays exactly as I hoped -- but no audio at all (again, it's going to Bluetooth). Now, I can switch over to Bluetooth and hear the sound but not get the display. I could kill the pairing to get both through HDMI, but now I lose the ability to receive calls over bluetooth with the handy steering wheel call answering and all of the amenities associated with that.
I'm wondering if there is some kind of workaround -- Android configuration that I've somehow never noticed, or a third party app -- which will allow the Nexus 5 to remain paired and actively Bluetooth connected while still sending audio through the HDMI port (Slimport). I don't see that this would as likely be a car-side solution.
The Nexus 5 is rooted stock 4.3.3.
Thank you in advance for help toward a solution.