My GT has a manual knob too. Unfortunately, ECU has no access to headlight levelers. And if it had, what would be the use case for this feature? Can't speak of the Mazda 6, but on both my Fords HID autolevel adjustment is done by the Ford diagnostics until. One car had very low levels and two minut...

Another one to add to the potential list.

Adjustment of headlight level for those models with HID's.