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So I recently purchased my 2002 Lexus is3. The speakers had no bolume come out since I got the car. I recently bought and installed a boss headunit. I still have no volume. What can be the common issue. I don’t really want to spend on new speakers or to replace amp. Seen a bypass harness on this vehicle I want to try and install to see if it’s because the factory amp but don’t know if it’s worth it.
 

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you need to buy harness that can utilize the factory amp. I believe it's call metro something. Just changing the head unit won't trigger the amp to turn on. I would test if the amp still works before bypassing it.
 

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Odds are your factory amp is toast.
I would check all the free stuff first (fuses, connectors, wiring, etc.)
You can test the speakers with an ohm meter or 9v battery.
Metra is the common brand for the bypass harness.
 
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