Rule of thumb is to get a SHORT and CATCHY slogan...
(see this
article...
Mine:
1) Entertainment at your fingertips.
2) Technology at your fingertips.
3) New generation of car entertainment.
4) Advanced vehicle interface.
5) Interact with your vehicle.
6) You, your ride, your computer.
7) Integrating technology in your car.
8) Making your ride a pleasent one.