Chosen Solution

My ipod is not outputting audio through the headphone jack, but when connected with a usb cable to the car stereo it works. Is this probably an issue with the logic board or headphone jack?

If you are getting audio through your USB connection and not the headphone jack, it is most likely the headphone jack that is the issue. iPod Classic (Thin) Headphone Jack & Hold Switch If you have the 160GB version, make sure you know if you have the “thick” or “thin” model: iPod Classic (Thick) Headphone Jack & Hold Switch

Thanks to be responsible for my ipod are of 30gb already probe with other audiophones and nothing then sera the jack of takes audio it to an Apple center and they said to me that it was the logic that I do not create