I have tried to hook up my new stereo, a Pioneer P4000, in my 2007 Mustang. I got everything situated for testing, plugged in battery, mounted stereo. I turned on my car, plugged in my iPhone 4s. It starts playing my song and displays the song info, the iPhone wont let me access the menus saying accessory connected, and the volume is up. There is no music coming from my speakers, although a slight fuzz (they're working). I do not have the correct adapter for the antenna, so I cannot test the radio, but when I select radio, I get a lot of static, as I would assume. Is it something wrong with the "mute" cable? I heard that has caused some issues. I have also tried the AUX port but still no sound with a little bit of fuzz. I believe I have everything wired right. What the poo is wrong!??