Without wanting to hack my OE Infinity Stereo (I assume non-NAV) I just picked up a $20 Bluetooth FM Transmitter ! It's also a close colour match to the Silver centre console, so almost looks a part of the car.
Plugs into the Cig socket and pairs with my iPhone immediately upon turning the ignition, then I have my music streaming out of the car speakers in an instant. Works great plus everything original and nothing disturbed, plus no extra leads poking out of the dash anywhere, like an extra limb.