Do you have a external amp (or monsoon amp) on the speakers. If so, you need to check its harness. Either the turn on signal, 12 volt or ground has a bad connection. If you have the speakers running off the HU, then it most likely has a internal problem with the amp.
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 2003 Maroon Alero GLS Sedan. (Purchased new in 2003 with 18 miles, and sold in 2006)
2004 Toyota Corolla LE (Purchased new in 2003 with 87 original miles)
2007 Toyota Camry LE (12 original miles)
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