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Hmm. It doesn't make sense that NONE of the speakers are working. Even if you hooked the positive and negative backwards, you would still hear something. I would check the head unit. Maybe use a meter and check for voltage coming out on the speaker wires (it will only be around 2.5-8 volts IIRC). Or if you have an extra speaker lying around you can hard wire it directly to the head unit. Then maybe check continuity of the factory wires.
Keep us posted
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