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Theft Deterrent System

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I have a '99 RX300 with 195,000 miles. Over the past year, the theft deterrent alarm (horn and flashing lights) goes off for no apparent reason and continues until I stop it with my key. It has happened more in hot weather although not exclusively. The alarm was on when I left work today (no idea how long it had been on), and the temp today only reached 91F, not nearly as hot as it has been here. This is extremely annoying and I find myself going out to the parking lot several times during the day to check on it. It's been a great car and I love it. I'd hate to give it up, any help would be greatly appreciated.

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