I can't comment on the GM remotes, but the Toyota remotes that we produce require a flash program. They are a two way remote. It may make a difference.
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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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