Why's my FIAT 500 aux not working?

If the aux port is not working on the FIAT 500 then You have a lack of power or the port has dirt in it. But what is an AUxAnd what does it do exactly. Well an aux-in (or auxiliary-in) socket in Your car is a 3.5mm jack into which You can plug anything that has a standard headphone connection. It sends sound to the multimedia system, enabling You to 'stream' music from a device through the car's speakers.Cars got auxiliary inputs, so users could plug in and listen to their own music from their preferred devices. HARMAN engineers were now involved in the planning phase of vehicle development, rather than simply being given small bores to affix speakers to.