Hey man, I asked the same question a couple months ago.
I was told there is NO wiring whatsoever for rear speakers, and for your time, its not even worth it to add rear speakers.
But if you are going to want to add them anyways, upgrade the HU. Its not worth the time and pain of getting the wiring to work with the stock stereo. Get a new one and there will already be wires ready to solder into for ya.
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