Need Help installing Sony M730 Head Unit

Hey guys I just bought a Sony M730 Head unit for my 1994 Civic DX. I bought the Wire Harness today to hook it up. I dont need a dash kit cause it has a pre built cage for the civic model 92-95. Here is a picture of the back of my new unit.

http://groups.msn.com/Kingofcards/sh...oto&PhotoID=73

Can anyone help me out. The factory system only has 2 outlets. The outlet to hook up the wire harness and then another cord that went into the back of the factory. Where does that wire plug into on the sony?

Any help I would really appreciate.

Thanks