I looked im my manual and it says: "The radio system is disabled (switched-off) when Transport Mode is activated. This is necessary to reduce battery drain when vehicles are transported over long distances or stored for longer periods of time."

It looks like you need a Vag-com tool to activate the radio. "Channel 99 Adaptation 0

Input adaptation value XXXXX

Indicated on display (example only):

- Enter desired adaptation value (e.g.: 00001 or 00000)
- 00000 = disable Transport -Mode
- 00001 = enable Transport -Mode "

I hope this helps.