If he has a sound system a good mistake is with the rca wires...make sure red is connected to red on amp/cd player...and same with white/black whatever color.Thats sounds to me like the problem (if he has a system that is)
NVM post skimming and didnt see the FACTORY SPEAKERS part...so yea check you wire harness wires and make sure the power antenna is ran into the main power wire also.
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WhiteLiquid
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