Precautions For Intelligent Key System
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.
The transponder [the chip for NVIS (NATS) ID verification] is integrated into the Intelligent Key. Therefore, ID verification cannot be performed using mechanical key only.
When Intelligent Key battery is discharged, the NVIS (NATS) ID verification can be performed by operating power switch after contacting Intelligent Key backside to power switch. If verification result is OK, the vehicle can be set to READY.