Adding an line in/ auxilary port in 2001 Ford Escort with Pioneer mosfet 50wx4

[cable729]

The title pretty much says it all. I'm not sure if I have an aftermarket headunit, I'm not sure what that means. What I have tried:

I took out the head unit with the AC knobs and radio etc. And behind it I thought I'd be able to plug in an RCA to mini jack that I could use with my ipod, but it turns out that the rca plugs on the back are output, not input. So I'm not sure where to go from here. Any advice?

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[ShiningBuick 10+ year member]

Does it have an IP Bus input??