System Composition

WARNING: This page is about a different car, the 2005 Nissan Quest. However, it is still accessible from the selected car via links, so may be relevant.

The immobilizer function of the NVIS (NATS) consists of the following:

NATS ignition key
NATS antenna amp. located in the ignition key cylinder
Body control module (BCM)
Engine control module (ECM)
Security indicator
NOTE: The communication between ECM and BCM uses the CAN communication system.

Fig 1: Identifying Ignition Key Communication System
Courtesy of NISSAN MOTOR CO., U.S.A.