ISTA/D
Vehicle Management --> Function Structure --> Body --> Lighting --> Adaptive Headlight Beam Throw Adjustment --> FTD Adaptive Headlights
That is a big section explaining a lot about how they work and the control structure. Should be something you can at least search on.
I don't know where in ISTA the testing is for the headlights. I do know I'd found it in INPA, by accident.
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