Installed on models with xenon lamps.
It is used to adjust the angle of the headlights.
When headlight aiming adjustment is not required, set the switch to position 0.
The correction is used in cases where, depending on the number of passengers or the weight of luggage, the angle of the body and, accordingly, the headlights, changes, as well as on roads with large elevation changes.
(Data copied from web resource: NISSANBOOK.RU)