FRONT AUTOMATIC AIR CONDITIONING SYSTEM : Air Outlet Control

WARNING: This page is about a different car, the 2011 Infiniti QX56. However, it is still accessible from the selected car via links, so may be relevant.

While air outlet is in automatic control, A/C auto amp. selects the front mode door position depending on a target front air mix door angle and outlet air temperature calculated from sunload.
If ambient temperature is excessively low, D/F is selected to prevent windshield fogging when air outlet is set to FOOT.

Fig 1: Air Outlet Control Chart
Courtesy of NISSAN MOTOR CO., U.S.A.