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The black ones are the standard nissan headunit plug (what the Metra kit hooks up to). I assume the brown and white are for a cd changer and for the navigation system audio, or maybe, if that's an 04 headunit, for that satellite radio thing they added (I don't know which is which). The circular one on the right is the antenna.
wow!!! i never knew that my Track's head unit have that many holes! my Celica's stock head unit only have one 'big' slot plus circular one for the antenna.