I have iphone 5 with ios 7.1.1 - bluetooth with Holden VE Omega - phone calls ok but music has stopped streaming

I have iPhone 5 using ios 7.1.1. I have no problems connecting via Bluetooth to my 2011 Holden VE Commodore's system. No problem with phone calls. Until last Friday, I streamed music from iPhone to car system with no problem - now cannot stream. I have disconnected phone from car listing & same with iPhone, re-booted the iPhone, then re-connected to the car system but still no music!! Can anyone assist please?