BS ALERT!!
Seriously, you ain't got the foggiest. RCA INS are, as you would expect, for putting a line level signal IN to the head unit. Such as an iPod signal.
We're talking OUT as we want signal out of the headunit. As someone already correctly stated, there are no line level outs (RCA or otherwise) on the stock head unit, but there are two sets of speaker level outs not used. They are for rear speakers and the S doesn't have any. You'll need some pins or a connector from another Honda car to connect these to the 'Speaker Level INS' of most consumer grade amps and play your doof-doof to your hearts content (although not your ears or neighbours).

