Without Intelligent Key System

SYSTEM

NISSAN VEHICLE IMMOBILIZER SYSTEM-NATS : System Description


SYSTEM DESCRIPTION

NISSAN VEHICLE IMMOBILIZER SYSTEM-NATS [NVIS(NATS)] has the following immobilizer functions:
- NVIS(NATS) shows high anti-theft performance to prevent engine from starting by anyone other than the owner who has the registered ignition key.
- The ignition key has NVIS(NATS) ID and only ignition key which has the same ID as the ID registered in
BCM and ECM can start engine. This makes high anti-theft performance to prevent the vehicle from being stolen using a copied ignition key.
- Security indicator lamp always blinks when ignition switch is in any position other than ON. Therefore, NVIS(NATS) warns outsiders that the vehicle is equipped with the anti-theft system.
- If the system detects a malfunction, security indicator lamp illuminates when ignition switch is turned ON.
- If the owner requires, ignition key ID can be registered for up to 5 keys.
- During trouble diagnosis, when additional ignition key is needed, or when the following components are replaced, the ID registration is required.
- BCM
- Ignition key
- Possible symptom of NVIS(NATS) malfunction is "Engine cannot start". The engine also can not be started because of other than the NVIS(NATS) malfunction, so start the trouble diagnosis according to Without Intelligent Key System.
- If ECM other than Genuine NISSAN parts is installed, the engine cannot be started. For ECM replacement procedure, Service and Repair.

SECURITY INDICATOR LAMP

- Security indicator lamp is located on combination meter and warns that the vehicle is equipped with NATS.
- Security indicator lamp always blinks, when the ignition switch is in any position other than ON.
- Security indicator lamp turns OFF when the ignition switch is turned ON.

OPERATION WHEN IGNITION KEY IS INSERTED INTO IGNITION KEY CYLINDER

1.When ignition switch is turned ON, BCM activates NATS antenna amp. to start NVIS(NATS) ID verification with the ignition key (transponder is integrated).
2.BCM receives the NVIS(NATS) ID signal from ignition key via NATS antenna amp. and verifies it with the registered ID.
3.When the NATS ID verification result is OK, BCM performs the ID verification between BCM and ECM.
4.When the verification result is OK, BCM transmits the verification OK signal to ECM, and then ECM can start the engine.
5.When the ignition switch is turned to the START position, BCM transmits the starter request signal to
IPDM E/R.