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if the rear fog light is done properly, with individual leads to each fog light and the correct programming of the LCM, then if your regular brake or tail light is out, the LCM should (I say should, as I have not tested it myself, but i saw it in operation on somebody's car) activate the fog light to substitute the burned tail/brake light...
other than that - the cavity that your are pointing to is vacant in the US E53s, no light bulb in there
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