AUTOMATIC AIR CONDITIONING SYSTEM : ECO Mode Control: Description

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

When ECO mode is selected with the electric shift selector, VCM transmits the ECO mode request signal to the A/C auto amp..
When the A/C auto amp. receives the ECO mode request signal, it performs control that reduces the power consumption of the A/C system.

Fig 1: ECO Mode Control Circuit Diagram (Automatic Air Conditioning System)
Courtesy of NISSAN MOTOR CO., U.S.A.