NVIS (Nissan Vehicle Immobilizer System - NATS)

System Description

NATS (Nissan Anti-Theft System) has the following immobilizer functions:
- Since only NATS ignition keys, whose ID nos. have been registered into the ECM and IMMU of NVIS (NATS), allow the engine to run, operation of a stolen vehicle without a NVIS (NATS) registered key is prevented by NVIS (NATS). That is to say, NVIS (NATS) will immobilize the engine if someone tries to start it without the registered key of NVIS (NATS).
- All of the originally supplied ignition key IDs have been NVIS (NATS) registered.
If requested by the vehicle owner, a maximum of five key IDs can be registered into the NVIS (NATS) components. All other existing keys will need to be re-registered if any additional keys are added.
- The security indicator blinks when the ignition switch is in "OFF" or "ACC" position. Therefore, NVIS (NATS) warns outsiders that the vehicle is equipped with the system.
- When NVIS (NATS) detects trouble, the security indicator lamp will illuminate continuously while ignition key is in the "ON" position.
- NVIS (NATS) trouble diagnoses, system initialization and additional registration of other NVIS (NATS) ignition key IDs must be carried out using CONSULT-II hardware and CONSULT-II NATS software.
- When NVIS (NATS) initialization has been completed, the ID of the inserted ignition key is automatically NVIS (NATS) registered. Then, if necessary, additional registration of other NVIS (NATS) ignition key IDs can be carried out. Regarding the procedures of NVIS (NATS) initialization and NVIS (NATS) ignition key ID registration, refer to CONSULT-II IVIS/NVIS.
- When servicing a malfunction of the NATS (indicated by lighting up of Security Indicator Lamp when ignition key is "ON") or registering another NVIS (NATS) ignition key ID no., it is necessary to re-register all original key identifications. Therefore, be sure to receive ALL KEYS from vehicle owner.




System Composition
The immobilizer function of the NVIS (NATS) consists of the following:
- NVIS (NATS) ignition key.
- NVIS (NATS) immobilizer control unit (NATS IMMU) located around the ignition key cylinder.
- Engine control module (ECM).
- Security indicator lamp.