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One beep means something isn't closed as others have suggested. IIRC correctly, one needs to tape over a wire if one fits an aftermarket radio. A search of the forums should provide more detail.
Two beeps means something has failed in the central locking system. Often one of the door lock micro-switches is the cause. But it could be many other things. For this situation, it's best to read the fault codes, clear them and then activate the various parts of the central locking system one by one. You might need a dealer or an independent to run the tests for you.
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