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Easiest way to test, assuming you know what pins go where, is to grab a spare speaker (or yank one of yours) and jumper directly from the head unit pins to the speaker. That will bypass everything else in the system. No sound means something is miswired or dead on the head unit.

Don't be too sure the head unit isn't faulty. Years ago, when I first got out of the service, I used to be an electronic technician for a car audio place. There was a surprising number of new, out of the box units with dead amps or other circuitry. This is going back 30 years ago, but there wasn't much coming from China back then either with most units either from Japan or South Korea.
 
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