Originally Posted by JMRouse
Your car uses a built in dock and not a USB port to interface with your iPod/IPhone?
EDIT: OK, I am confused on this and know it's come up several times before in this thread, without a formal answer. The dock adapter is only needed for plugging your iPhone into docks. The adapter itself is what's causing the issue here. If your stereo interfaces with the i-product via USB, then you should still be fine right and have no issues here right? That's my understanding.
I believe so. If your car uses a USB connection, then you should be fine (leaving aside issues of software compatibility that may crop up with new iOS versions). If your car uses an analog connection (eg. Aux In), then you can either take the signal from the headphone jack, or wait for the 30-pin connector.
The systems in my cars use the 30-pin connector, but they use the analog signals on the 30-pin instead of the digital ones. Audio systems that use USB connections use the digital signals in the 30-pin connector. The Apple Store page for the 30-pin adapter now explicitly says that analog audio output will be supported. Only analog video output won't be.
I could use the headphone jack, but I'd have to go dig lots of wires out of the dashboard, and I'm too lazy to do that. It also won't recharge the phone in the car. Also, I'll be switching to Verizon from AT&T because there's no AT&T LTE here, but there is very good Verizon LTE, so that's another barrier to upgrade, again due mainly to laziness. Anyway, I'm now entertaining the idea of waiting til the 5S.