How do you play an ipod on a factory car stereo?

You can get an iTrip with smart scan. It works very good. You plug it into the 12v thing in your car and it works through radio stations.

I'm using an Eonon car Head unit which can connect to iPod itself with a IPOD Cable, very convenient to use. So you can also get a HU which with ipod support function. Eonon is quite good. http://www.eonon.com/2-Din-DVD-Player/E1091.html?utm_source=wiki.answers.com&utm_medium=answer&utm_campaign=answer