Audio Systems: Axxess Ipod input., new ipods, other vehicles

Question
I bought an Axxess aux input. But when I plugged it into my 2004 Jeep head unit. It does not appear to get any power. Do you know if there is a fuse or breaker in the head unit that may need replacement? Thanks, I really appreciate your help. If you have a better solution, please let me know.

Answer
clear or white boxes are having a lot of problems they are also universal for a lot of other vehicles besides your
the other problem is that they are not compatible with the new ipods and no there are no fuses

this is what we sue all the the time
http://www.oemautosound.com/pc-230-192-pie-pa11-chr-jeep-to-ipod-interface.aspx