Can you go in more depth about this? How did you integrate it with the entertainment system, and what do specifically do you do with it?
- Some kind of CAN bus hack. They exist.
- He has a ford and hardware that can interact with openXC CAN2-2 see here: http://openxcplatform.com/vehicle-interface/hardware.html
- He's using bluetooth.
I believe Ford has some open stuff you can connect a laptop to.
Here’s an older video with some interesting details: https://m.youtube.com/watch?v=KX_0c9R4Fng
The C2 radio port gets you direct access to the vehicle's CAN-Bus system, which itself is generally segmented into a high frequency (safety critical systems: drivetrain, drive-by-wire steering if applicable, braking, etc) and a low frequency system (door locks, sound system, windows, etc.) If you reverse engineer your vehicle's CAN protocol (each manufacturer uses their own codes on a standard CAN transport protocol), you can issue commands to it directly from your Pi.