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First off, you need to figure out what parts were on your car originally. Have someone run your VIN and confirm what all components/functions were there. Some of the pieces may not need to be physically replaced if their missing, but you may need to code them out or something, just depends. But I'd start with finding out what all features were supposed to be then verify the related parts for each function is present(if the function isn't working) and figure out what's left.
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