Actualy I ran into a issue just like this with mine, if I'm at work and have the "media" volume down real low to watch youtube incognito while I'm actualy in the office, when I hop in the car I can run the "bluetooth" volume up but if I dont turn up the media volume before connecting or by navigating to it in settings it only plays at the lower level. I'm using an eclipse deck, I actualy cant use the hands-free-phone profile on it since GB but the media still works fine, so does the skip/fwd/pause funcionality.
Good Luck,
John