Don't computerize the simple mechanical parts of a car. Just DON'T. You're collective playlists aren't worth the inevitable police and attacker control and surveillance of our cars.
No, you and you, you can't outsmart them. You can't be God King of Koding and Do It Right. There is always a way, if you permit freaking Turning machines to control your vehicle, for someone to take control.
A machine, a successful, elegant device that occupies the lowest possible fail state, is one that has as few moving parts as possible. Any turing box, by which I mean a programmable computer, that connects in is a complete failure of design if it is not utterly necessary. Brakes, steering, locks. and acceleration have been mechanical systems for over a century and a half. No need to interface hundreds of computers, sensors, and telematic holes into something that already WORKS.