I must admit a few days ago I was willing to give up on my HZA WG59 nav unit. I could not get the SD card to play any of my music for some bizarre reason. I have successfully managed to connect my phone via Bluetooth as an external media. So now I can play my music from phone and control the volume and track selection from the steering wheel controller. Note this unit has an unusual Bluetooth connection. Once have paired your phone to the unit you must press an icon on the screen 'connect' to connect your phone. Most Bluetooth devices wold connect as soon as your Bluetooth is initialised. Not this unit, you must press connect on the unit if the 'BT' has been struck out. I tried connecting my phone via a aux lead, absolutely rubbish, stick with Bluetooth or CDs. In my next post I will experiment with the DVD player.