Roberto, wiring diag. off a 2011 24s shows; Drop location coming from ceiling along side of pantry, wiring schematic indicates purple: bath vanity power feed, black: vanity light power feed. White not shown, so like raspivey said probably ground.
I hope this is more specific of answering your question. My guess, and it is only a guess, is that the wiring didn't change much in model S from year to year, BUT its just a guess.
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