[trez63]

That USB connection is likely not using the correct profile. I believe on the dot it's simply for power and charging and you're trying to use it for USB media storage which the Dot doesn't do. The USB audio source on your car is meant for devices that store the audio files on a usb mounted storage. Most phones have a special profile for USB mounting that facilitates this but the Dot wouldn't. You might be able to do connect the dot to your car's Bluetooth audio.

 

[trez63]

Thanks for the reply... I've actually solved the problem since my original post and it is working fine now. I'm not actually trying to use the USB as an audio source, only a power source (the photo i posted may have made you think this but it just shows the last selected source).... I connected the dot to the internet via the car's wifi hotspot (which uses a mobile data sim)... I then connected the dot to the media center via bluetooth. The problem I was having was that the dot didn't then appear as a selectable source in media settings. When I turned the car off and back on again - BINGO - it appeared as a media source. Obviously this isn't perfect but if people follow the same steps exactly (remembering to pair bluetooth first then restart car) it should work fine!

Oh I see. What you also might consider is using a "charge only" usb cable. That is a must when charging phones.