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Home >> Infiniti >> 2008 >> M35x AWD V6-3.5L (VQ35DE) >> Repair and Diagnosis >> Accessories and Optional Equipment >> Antitheft and Alarm Systems >> Description and Operation >> IVIS (Infiniti Vehicle Immobilizer System-NATS)

IVIS (Infiniti Vehicle Immobilizer System-NATS)

IVIS (INFINITI VEHICLE IMMOBILIZER SYSTEM-NATS)

Schematic









NOTE:If customer reports a "No start" condition, request ALL KEYS to be brought to an INFINITI dealer to check for an IVIS (NATS) malfunction.


System Description

DESCRIPTION
- The IVIS (NATS) is an anti-theft system by registering an Intelligent Key ID in to the vehicle and prevents the engine being started by an unregistered Intelligent Key. It has a higher protection against auto thefts that duplicates mechanical key.
- It performs the ID verification when starting the engine in the same way as the Intelligent Key system. But, it performs the IVIS (NATS) ID verification when inserting the Intelligent Key and performs the Intelligent Key ID verification when carrying the Intelligent Key.
- The Intelligent Key system of FUGA (Y50) is not the same as the conventional models. The mechanical key integrated in the Intelligent Key cannot start the engine. When the Intelligent Key battery is discharged, the IVIS (NATS) ID verification memorized to the transponder integrated with Intelligent Key is performed by inserting the Intelligent Key into the key slot. If the verification results are OK, the engine start operation can be performed by the push-button ignition switch operation.
- Locate the security indicator and apply the anti-theft system equipment sticker, forewarn that the IVIS (NATS) is on board with the model.
- The security indicator always blinks when the Intelligent Key is removed from the key slot and when the power supply position is in LOCK position.
- Intelligent Key can be registered up to 4 keys (Including the standard ignition key) on request from the owner.
- The specified registration is required when replacing ECM, BCM or Intelligent Key. The registrations procedure for IVIS (NATS) and registration procedure for Intelligent Key when installing the Intelligent Key unit, refer to CONSULT-III Operation Manual NATS-IVIS/NVIS.
- Possible symptom of IVIS (NATS) malfunction is "Engine cannot start". In FUGA (Y50), the engine can be started with the Intelligent Key system and IVIS (NATS). Identify the possible causes according to "Work Flow", Refer to BL-238, "Work Flow". IVIS (Infiniti Vehicle Immobilizer System-NATS)
- If ECM other than Genuine NISSAN is installed, the engine cannot be started. For ECM replacement procedure, refer to BL-221, "ECM Re-Communicating Function". Programming and Relearning

PRECAUTIONS FOR KEY REGISTRATION
- The key registration is a procedure that erases the current IVIS (NATS) ID once, and then re register a new ID operation. Therefore the registered Intelligent Key is necessary for this procedure. Before starting the registration operation collect all registered Intelligent Key from the customer
- When registering the Intelligent Key, 2 registration procedures [IVIS (NATS) ID registration and Intelligent Key ID registration] should be performed. The IVIS (NATS) ID registration is the procedure that registers the ID stored into the transponder (integrated into Intelligent Key) to the BCM. The Intelligent Key ID registration is the procedure that registers the ID to the Intelligent Key unit. Each registration procedure should be done separated.
- When performing the Intelligent Key system registration only, the engine cannot be started by inserting the key into the key slot. When performing the IVIS (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
- Warn the outside that the vehicle is the model with IVIS (NATS).
- The security indicator always blinks when the Intelligent Key is removed from the key slot and when the ignition switch is in LOCK position.

NOTE: Because security indicator is highly efficient, the battery is barely affected.

Operation Description

SYSTEM DIAGRAM






OPERATION WHEN INSERTING TO KEY SLOT
1. When inserting the Intelligent Key (with transponder) into the key slot, the key switch in the key slot turns ON, and then it is detected that the Intelligent Key is inserted.
2. When pressing the push-button ignition switch at that time, BCM starts the IVIS (NATS) antenna amplifier integrated with the key slot and starts the IVIS (NATS) ID communication with the transponder integrated with the Intelligent Key.
3. BCM sends the IVIS (NATS) ID verification result to ECM via CAN communication and performs the ID verification.
4. If the IVIS (NATS) ID verification result is OK, BCM sends the key ID verification OK signal to Intelligent Key unit via CAN communication line.
5. The Intelligent Key unit sends the steering unlock signal to the steering lock unit when receiving the signal. Then, it sends each power supply request signal to PDU (Power Distribution Unit) after unlocking the steering lock.
6. If the Intelligent Key unit judges that the engine start condition is satisfied, it sends the starter request signal via CAN communication to IPDM E/R and turns the starter motor relay ON.
7. The steering lock unit unlocks the latch when receiving the signal. PDU starts the power distribution according to the power supply position when receiving the signal.

NOTE: If it is not in the engine start condition*, the starter motor relay is turned OFF. Therefore, the engine cannot be started and the power distributions of ACC, ON, and LOCK are performed only according to the push-button ignition switch operation.
*: For the engine start condition, refer to "PUSH-BUTTON IGNITION SWITCH OPERATION PROCEDURE".

OPERATION WHEN INTELLIGENT KEY IS CARRIED
By carrying the Intelligent Key, the engine start/stop operation can be performed only when pushing the pushbutton ignition switch.

PUSH-BUTTON IGNITION SWITCH OPERATION PROCEDURE
The power supply position changing operation can be performed with the following operation.

NOTE:
- When an Intelligent Key is carried and when it is inserted to the key slot, the following operation is the same.
- When starting the engine, the Intelligent Key unit monitors the engine start conditions (brake pedal operation, A/T selector lever position, vehicle speed, and steering lock condition).
- Unless each start condition is fulfilled, the engine will not response regardless of how many times the pushbutton ignition switch is pushed. At that time, illumination repeats the position in the order of LOCK ---> ACC ---> ON ---> LOCK.




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