Specifications

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GENERAL OPERATION
INTRODUCTION
The Nissan Anti Theft System (NATS) was introduced initially around 1995 with
a basic immobiliser, which did not use key transponders. This system was
known as NATS 1. Subsequently NATS 2 was introduced which uses the trans-
ponder technology.
Further iterations of the NATS system have been introduced, up to the latest
system NATS 5. The earlier systems use a security timed access, similar to Ford
systems, which require a period of time before the keys can be programmed.
The latest system NATS 5 uses a pin code, as with GM and VAG systems. This
system was fitted on vehicles from 2001 MY onwards.
NATS IGNITION KEY
This uses standard transponder technology, and have both RED and BLUE chips
to identify non crypto and crypto type transponders. The BLUE chip types are fit-
ted on the latest NATS 5 system.
When programming keys, on NATS systems up to NATS 4, all keys stored in
memory will be deleted, however on NATS 5 additional keys can be added. Up to
5 keys can be programmed into NATS 5 systems, and 4 keys into NATS 2,3 & 4
systems.
NATS IMMOBILISER UNIT
The NATS immobiliser unit, is normally mounted next to the ignition switch or
behind the fascia area. The unit is sometimes also fitted with a dongle unit, and
is fitted on right hand drive European vehicles for extra security.
The NATS immobiliser controls signals to the Engine Control Module (ECM)
which inhibit starting.
On later systems there is also an input from the Audio system, which if discon-
nected inhibits the starting of the vehicle.
NATS SECURITY INDICATOR
The security LED is normally mounted in the dashboard area and indicates the
status of the system.
When a problem is detected, the LED will indicate the fault as listed in the fol-
lowing table when the IGN is ON or in accessory position.
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