I'm not entirely sure what types of connections you've got on the back of your EQ/Amp, so it's hard to tell you how to wire it up.
If you're talking about the RCA cables (red, white), I'm fairly certain that there aren't any RCA outputs on the OEM headunit. (There aren't any on my OEM headunit from a 2001) You can buy adapters, however, that will do this, even from Metra (the company who manufactures the EQ/Amp you've got).
Metra Electronics - Products
If this isn't what you're asking or looking for, let us know.
Hope this helps.