With Intelligent Key System

SYSTEM

NISSAN VEHICLE IMMOBILIZER SYSTEM-NATS : System Description


SYSTEM DESCRIPTION

- The NISSAN VEHICLE IMMOBILIZER SYSTEM-NATS [NVIS (NATS)] prevents the engine from being started by Intelligent Key whose ID is not registered to the vehicle (BCM). It has higher protection against auto theft involving the duplication of mechanical keys.
- The ignition key integrated in the Intelligent Key cannot start the engine. When the Intelligent Key battery is discharged, the NVIS (NATS) ID verification is performed between the transponder integrated into Intelligent
Key and BCM via NATS antenna amp. when the Intelligent Key backside is contacted to push-button ignition switch. If the verification results are OK, the engine start operation can be performed by the push-button ignition switch operation.
- The security indicator lamp on combination meter always blinks when the power supply position is any position other than ON which warns that the NVIS (NATS) is on board the model.
- Up to 4 Intelligent Keys can be registered (including the standard ignition key) upon request from the owner.
- Specified registration is required when replacing ECM, BCM or Intelligent Key.
- Possible symptom of NVIS (NATS) malfunction is "Engine cannot start". The engine can not be started because of other than NVIS (NATS) malfunction, so start the trouble diagnosis according to "Work
Flow".
- If ECM other than genuine part is installed, the engine cannot be started. For ECM replacement procedure, Work Procedure.

PRECAUTIONS FOR KEY REGISTRATION

- The ID registration is a procedure that erases the current NVIS (NATS) ID once, and then registers a new ID.
Therefore before starting the registration operation, collect all registered Intelligent Keys from the customer.
- When registering the Intelligent Key, perform only one procedure to simultaneously register both ID [NVIS
(NATS) ID and Intelligent Key ID].

SECURITY INDICATOR LAMP

- Warns that the vehicle is equipped with NVIS (NATS).
- Security indicator lamp always blinks when the power supply position is any position other than ON.
NOTE:
Because security indicator lamp is highly efficient, the battery is barely affected.

ENGINE START OPERATION WHEN INTELLIGENT KEY IS CONTACTED TO PUSH-BUTTON IGNITION SWITCH

1.When brake pedal is depressed, while selector lever is in the P position (CVT models), BCM activates
NATS antenna amp. that is located behind push-button ignition switch.
2.When Intelligent Key (transponder built-in) backside is contacted to push-button ignition switch, BCM
starts NVIS (NATS) ID verification between BCM and Intelligent Key (transponder built-in) via NATS
antenna amp.
3.When the NVIS (NATS) ID verification result is OK, buzzer in combination meter sounds and BCM transmits the result to ECM.
4.When push-button ignition switch is pressed, BCM turns ACC relay ON and transmits ignition power supply ON signal to IPDM E/R.
5.IPDM E/R turns the starter control relay ON for engine starting in advance.
6.IPDM E/R turns the ignition relay ON to start the ignition power supply.
7.BCM detects that the selector lever position and brake pedal operating condition (CVT models), or clutch pedal operation condition (M/T models).
8.BCM transmits starter request signal to IPDM E/R and turns the starter relay in IPDM E/R ON if BCM
judges that the engine start condition* is satisfied.
9.Power supply is supplied to the starter motor through the starter relay and the starter control relay.
10.When BCM receives feedback signal from ECM indicating that the engine is started, BCM transmits a stop signal to IPDM E/R to stop cranking by turning off the starter motor relay. (If engine start is unsuccessful, cranking stops automatically within 5 seconds.)
*: For the engine start condition, refer to "POWER SUPPLY POSITION CHANGE TABLE BY PUSH-BUTTON
IGNITION SWITCH OPERATION" below.

POWER SUPPLY POSITION CHANGE TABLE BY PUSH-BUTTON IGNITION SWITCH OPERA-


TION

The power supply position changing operation can be performed with the following operations.
NOTE:
- When an Intelligent Key is within the detection area of inside key antenna and when Intelligent Key backside is contacted to push-button ignition switch, they are equivalent to the operations below.
- When starting the engine, the BCM monitors the engine start conditions as per the following,
CVT models
- Brake pedal operating condition
- Selector lever position
- Vehicle speed
M/T models
- Clutch pedal operating condition
- Vehicle speed
Vehicle speed: less than 4 km/h (2.5 MPH)










Vehicle speed: 4 km/h (2.5 MPH) or more