With Intelligent Key System

NISSAN VEHICLE IMMOBILIZER SYSTEM-NATS


System Description


SYSTEM DESCRIPTION
- The NVIS (NATS) is an anti-theft system that registers an Intelligent Key ID to the vehicle and prevents the engine from being started by an unregistered Intelligent Key. It has higher protection against auto theft involving the duplication of mechanical keys.
- It performs ID verification when starting the engine in the same way as the Intelligent system, but it performs the NVIS (NATS) ID verification when inserting the Intelligent Key and performs the Intelligent Key ID verification when carrying the Intelligent Key.
- The mechanical key integrated in the Intelligent Key cannot start the engine. When the Intelligent Key battery is discharged, the NVIS (NATS) ID verification memorized to the transponder integrated with 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.
- Locate the security indicator lamp and apply the anti-theft system equipment sticker that warns that the NVIS (NATS) is on-board the model.
- Security indicator lamp always blinks when the power supply position is in any position except the ON position.
- 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. For the registrations procedures for NVIS (NATS) and Intelligent Key when installing the BCM, refer to CONSULT-III Operation Manual NATS-IVIS/NVIS.
- Possible symptom of NVIS (NATS) malfunction is "Engine cannot start". The engine can be started with the Intelligent Key system and NVIS (NATS). Identify the possible causes according to "Work Flow". With Intelligent Key System.
- If ECM other than genuine part is installed, the engine cannot be started. For ECM replacement procedure, Additional Service When Replacing Control Unit.

PRECAUTIONS FOR KEY REGISTRATION
- The key registration is a procedure that erases the current NVIS (NATS) ID once, and then reregisters a new ID operation. Therefore a registered Intelligent Key is necessary for this procedure. 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).
The NVIS (NATS) ID registration is the procedure that registers the ID stored into the transponder (integrated in Intelligent Key) to BCM.
The Intelligent key ID registration is the procedure that registers the ID to BCM.
- When performing the Intelligent Key system registration only, the engine cannot be started by Intelligent Key backside is contacted to push-button ignition switch. When performing the NVIS (NATS) registration only, the engine cannot be started by the operation when carrying the key. The registrations of both systems should be performed.

SECURITY INDICATOR LAMP
- Warns that the vehicle is equipped with NVIS (NATS).
- Security indicator lamp always blinks when the ignition switch is in any position except the ON position.

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, BCM activates immobilizer antenna amplifier that is located on push-button ignition switch backside.
2. When Intelligent Key (transponder built-in) backside is contacted to push-button ignition switch, immobilizer ID verification is started between Intelligent Key built-in transponder and immobilizer antenna amplifier.
3. When immobilizer ID verification result is OK, buzzer in combination meter sounds.
4. BCM transmits immobilizer ID verification result to ECM via CAN communication.
5. When push-button ignition switch is pressed, BCM transmits steering unlock signal to steering lock unit and IPDM E/R.
6. IPDM E/R supplies power supply to steering lock unit via steering lock relay.
7. When unlocking steering lock, steering lock unit unlocks steering lock.
8. When BCM detects that steering is unlocked, power supply stop signal is transmitted to IPDM E/R.
9. IPDM E/R turns steering lock relay OFF and stops power supply to steering lock unit.
10. BCM turns ACC relay ON and transmits ignition power supply ON signal to IPDM E/R.
11. IPDM E/R turns ignition relay ON and starts ignition power supply.
12. BCM detects that the shift position is P or N.
13. BCM transmits starter request signal to IPDM E/R via CAN communication.
When engine start conditions* are satisfied, BCM turns starter motor relay in IPDM E/R ON.
14. When starter request signal is received, IPDM E/R turns starter motor control relay ON.
15. IPDM E/R supplies power supply via starter motor relay and starter motor control relay, activates starter motor, and starts cranking.
16. When BCM receives engine start or speed feedback signal from ECM, BCM transmits stop signal to IPDM
E/R, turns starter motor relay OFF, and stops cranking.

POWER SUPPLY POSITION CHANGE TABLE BY PUSH-BUTTON IGNITION SWITCH OPERATION
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, it is equivalent to the operations below.
- When starting the engine, the BCM monitors under the engine start conditions,
- Brake pedal operating condition
- Selector lever position
- Vehicle speed