More than likely your immobilizer got wet and got fried. You need to see how water got to it. FYI I sell the kit you'll need for $350(immobilizer, dme, key, and locks). Unfortunately I don't have one for a 2003/04 but eBay is your friend. Go grab your box back and buy one off of eBay for a lot less than the dealer is charging you.
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Woody
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