A bad electrical portion of the switch can produce a remarkable variety of issues. Replace that portion and your problems will most likely go away. Locking the driver's door should not cause the horn to beep; your center console lid is unlatched or there's another open switch in the circuit. First things first: replace the electrical portion.
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2000 Boxster S, 6 speed, Sport Package, Litronics, LED tail lights, LNE IMS-B, OBC, Skybreaker wind deflector, Arctic Silver/Graphite Grey
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