I am getting a wierd buzz (almost like an improper grounding issue) when i use my iphone 4S with the aux port. Non issue with headphones, and non issue when i use the USB port for the car (or any other radio funtion). I have not tried the Y cable since i mostly use Pandora and I dont think this works with the cable (its a 2007 model w/nav).
Anyone have this issue? Is it fixable?