Automatic Air Flow Control

WARNING: This page is about a different car, the 2018 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.

A/C auto amp. decides target air flow depending on target air mix door opening angle.
A/C auto amp. changes duty ratio of blower motor control signal and controls the air flow continuously so that air flow matches the target air flow.
When air outlet is VENT or B/L, the minimum air flow is changed depending on sunload.

Courtesy of NISSAN NORTH AMERICA, INC.