Do semis have a port for ipods and such?

I have an '09 Pro Star that doesn't have the obvious 3.5 mm jack for me to plug my xm radio into but it claims it has external audio feature but I have yet to figure out how it works and I'm usually pretty savvy with this stuff.

 

Some radios in trucks need a separate mini jack. If your radio has an "AUX" source setting, look around for the jack, it could be pretty much anywhere.

 

You will have to pull the radio to find it. There should be a red and white pair of phono connectors where you can plug in a headphone to phono adapter cable.