You know the Auxiliary "port" next to the parking brake on the 06 Scion XA? What cable do i need to buy to hook the car audio system through the "cable" to my ipod

 

you need an 1/8th inch mini to 1/8th inch mini plug (a 1/8th inch plug is the same as the plug on your headphones). Just go to radio shack and get a cable with the male plug on each end. One end plugs into the headphone jack on your ipod, the other end goes into the AUX port.