Currently in my car I have a cable that gives me an 'AUX' in via the CD Changer port.

The port itself has a variety of pins and, after looking at some diagrams and a tip off on the stack page, it would be great if I could interface the Pi via that port. It opens up all kinds of possibilities; sound from the Pi via the cable I currently have in place, reading of the steering wheel controls, and writing track/folder data to the head unit's display.

For the last two I will need to be able to read/write to the CAN Bus, i believe.

On the Pi side of things i would look to fit the Pi in the glove box, giving a short cable run to the back of the head unit, and no need to modify the car in any way. If i can power the Pi from behind the head unit that would be awesome, otherwise I'd have to run a cable from the 12v lighter via an in-car USB charger.

Software I would aim to have the Pi have several modes; Bluetooth - where devices can connect to it as if it's a Bluetooth speaker, WiFi - where users can stream to it, and local - where it plays files from the Pi itself via a USB stick (automatic mounting preferable).

Until I can fathom the CAN Bus and get controls and the screen utilised I will take a look at using #pyLCS - Linux Control System to provide an interface for my device.

I can't wait to start having a play around with it!