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does the fade front to back work properly? My gut says either wiring harness or head unit issue. I'm guessing the head unit isn't one that requires an amp like 4V Hi Output model. Have you tried bypassing the amp and just running some wire from the head unit directly to the speakers as a test? In my Jetta I lost all sound out of the rear speakers, factory radio, and I kept thinking amp, some to find out something in the head unit died and wouldn't send a signal to the back speakers.
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