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It sounds like the dealer is giving you the run around and trying to rip you off. Have it towed to another dealer to get fixed, or get GM involved. Adding HID's and a sub will have no effect on the PCM, and I've never heard of a battery being "improperly installed" and frying anything. Maybe reversing the polarity, but kinda hard to do accidentally with a stock battery in the stock location, if that's what you still have.
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