Air Flow Control: Description

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

A/C auto amp. changes duty ratio of front blower motor control signal to control air flow continuously. When air flow is increased, duty ratio of front blower motor control signal gradually increases to prevent a sudden increase in air flow.
In addition to manual control, air flow control is composed of fan speed control at door motor operation.