If you don't have a external amplifier and more than one speaker stopped then the HU is deffinately to blame. If only one speaker stops working it could be the HU, wiring, or speaker. You may take the radio in and see if it is under warranty as well. The manufacturer of the HU has a seperate warranty than GM. Fujitsu HU's are warrantied for five to seven years depending on the product. I think that Delco carries a five year warranty.
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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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