The rear speakers are wired just like the wiring diagram above, passenger side: one pink, one blue, driver side: one red, one green. I can't find any sign of other wires that would have hooked up to an amp. There isn't any sort of plug on the speaker wire, just the two wires come out of the harness and are twisted to the leads of the speakers. From what I read, it seemed like the speakers could work if the head unit had a signal for turning on an amp, which I think mine does, though I need to check.
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