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Home >> Infiniti >> 2012 >> M35h V6-3.5L (VQ35HR) Hybrid >> Repair and Diagnosis >> Accessories and Optional Equipment >> Antitheft and Alarm Systems >> Description and Operation >> Infiniti Vehicle Immobilizer System-NATS >> System Description

System Description




SYSTEM

INFINITI VEHICLE IMMOBILIZER SYSTEM-NATS : System Description


SYSTEM DESCRIPTION

- The INFINITI VEHICLE IMMOBILIZER SYSTEM-NATS [IVIS (NATS)] prevents the vehicle from being set to
READY is 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 mechanical key integrated into the Intelligent Key cannot set the vehicle to READY. When the Intelligent
Key battery is discharged, the IVIS (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 while brake pedal is depressed. If the verification result is OK, the vehicle can be set to READY by the push-button ignition switch operation.
- Security indicator lamp is located on combination meter, and always blinks when the ignition switch is in any position other than ON to warn that the vehicle is equipped with IVIS (NATS).
- Up to 4 Intelligent Keys can be registered (including the standard ignition key) upon request from the owner.
- When replacing HPCM, BCM, steering lock unit (Models with steering lock unit) or Intelligent Key, the specified procedure (Initialization and registration) using CONSULT is necessary.
- Possible symptom of IVIS (NATS) malfunction is "Vehicle cannot be set to READY". This symptom also occurs because of other than IVIS (NATS) malfunction, so start the trouble diagnosis according to Initial Inspection and Diagnostic Overview.
- If HPCM other than genuine part is installed, the vehicle cannot be set to READY. For HPCM replacement procedure, Work Procedure.

PRECAUTIONS FOR KEY REGISTRATION

- When registering the Intelligent Key, perform the procedure following the instruction of CONSULT display.
- The ID registration procedure erases the current IVIS (NATS) ID once, and then reregisters a new ID.
Therefore before starting the registration operation, collect all registered Intelligent Keys from the customer.

SECURITY INDICATOR LAMP

Security indicator lamp always blinks when the ignition switch is in any position other than ON, to warn that the vehicle is equipped with IVIS (NATS).
NOTE:
Because security indicator lamp is highly efficient, the 12V battery is barely affected.

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

Models with steering lock unit
1.When brake pedal is depressed while selector lever is in the P position, BCM activates NATS antenna amp. which is located behind push-button ignition switch.
2.When Intelligent Key (transponder built-in) backside is contacted to push-button ignition switch, BCM
starts IVIS (NATS) ID verification between BCM and Intelligent Key (transponder built-in) via NATS
antenna amp.
3.When IVIS (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 transmits steering unlock signal to steering lock unit and IPDM E/R.
5.IPDM E/R turns steering lock relay ON to supply power source to the steering lock unit.
6.The steering lock is released.
7.BCM transmits the power supply stop signal to IPDM E/R when detecting that the steering lock is in the unlock position.
8.IPDM E/R turns steering lock relay OFF to stop power supply to the steering lock unit.
9.BCM turns ACC relay ON and transmits ignition power supply ON signal to IPDM E/R.
10.IPDM E/R turns the ignition relay ON to start the ignition power supply.
11.BCM detects that the selector lever position and brake pedal operating condition.
12.BCM transmits READY signal to HPCM if BCM judges that the READY set condition* is satisfied.
*: For READY set condition, refer to "READY SET CONDITION TABLE BY PUSH-BUTTON IGNITION
SWITCH OPERATION" below.

CAUTION:
- If a malfunction is detected in the Intelligent Key system, "I-KEY system fault" on information display appears. In this case, BCM does not transmits READY signal.
- When the Intelligent Key is carried outside of the vehicle (inside key antenna detection area)
while the ignition switch position is ACC or ON, BCM does not transmits READY signal even if
READY set condition* is satisfied.
13.When BCM receives feedback signal from HPCM indicating that the vehicle is set to READY, BCM stops transmitting READY.
Models without steering lock unit
1.When brake pedal is depressed while selector lever is in the P position, BCM activates NATS antenna amp. which is located behind push-button ignition switch.
2.When Intelligent Key (transponder built-in) backside is contacted to push-button ignition switch, BCM
starts IVIS (NATS) ID verification between BCM and Intelligent Key (transponder built-in) via NATS
antenna amp.
3.When IVIS (NATS) ID verification result is OK, buzzer in combination meter sounds and BCM transmits the result to ECM.
4.BCM turns ACC relay ON and transmits ignition power supply ON signal to IPDM E/R.
5.IPDM E/R turns the ignition relay ON to start the ignition power supply.
6.BCM detects that the selector lever position and brake pedal operating condition.
7.BCM transmits READY signal to HPCM if BCM judges that the READY set condition* is satisfied.
*: For READY set condition, refer to "READY SET CONDITION TABLE BY PUSH-BUTTON IGNITION
SWITCH OPERATION" below.

CAUTION:
- If a malfunction is detected in the Intelligent Key system, "I-KEY system fault" on information display appears. In this case, BCM does not transmits READY signal.
- When the Intelligent Key is carried outside of the vehicle (inside key antenna detection area)
while the ignition switch position is ACC or ON, BCM does not transmits READY signal even if
READY set condition* is satisfied.
8.When BCM receives feedback signal from HPCM indicating that the vehicle is set to READY, BCM stops transmitting READY.

READY SET CONDITION TABLE BY PUSH-BUTTON IGNITION SWITCH OPERATION

The vehicle can be set to READY by 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 setting the vehicle to READY, the BCM monitors the following conditions.
- Brake pedal operating condition
- Selector lever position
- Vehicle speed
Vehicle speed: less than 4 km/h (2.5 MPH)





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




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