I would also make sure this option is set to "nicht aktiv" it is rear fog lights as parking light:

NSL_ALS_STANDLICHT :Foglights as parking light


I think the US Option is a good way to start, but again even if we get it coded correctly you are still theorizing that the trailer connector X609 does not receive voltage from the LCM, you would have to have AHM trailer module in place?

Obviously I would test these NCS values without the trailer module in place and see if changing a line or two in programming would change voltage at the X609 pins 10 and 12

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