Infiniti QX56 (Z62). Manual - part 1156

SEC-14

< SYSTEM DESCRIPTION >

[WITH INTELLIGENT KEY SYSTEM]

SYSTEM

• When ignition switch is in the OFF position, selector lever is in the P position, and any of the following condi-

tions are met.

- Closing door
- Opening door
- Door is locked using door request switch
- Door is locked using Intelligent Key
• When BCM power consumption control system is released by meeting any of the following conditions.
- Opening any door
- Operating door lock using door request switch
- Operating door lock using Intelligent Key

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, 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

Vehicle speed: less than 4 km/h (2.5 MPH)

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

Emergency stop operation

• Press and hold the push-button ignition switch for 2 seconds or more.

• Press the push-button ignition switch 3 times or more within 1.5 seconds.

INFINITI VEHICLE IMMOBILIZER SYSTEM-NATS

Power supply position

Engine start/stop condition

Push-button ignition switch 

operation frequency

Selector lever

Brake pedal operation 

condition

LOCK 

→

 ACC

—

Not depressed

1

LOCK 

→

 ACC 

→

 ON

—

Not depressed

2

LOCK 

→

 ACC 

→

 ON 

→

 OFF

—

Not depressed

3

LOCK 

→

 START

ACC 

→

 START

ON 

→

 START

P or N position

Depressed

1

Engine is running 

→

 OFF

—

—

1

Power supply position

Engine start/stop condition

Push-button ignition switch 

operation frequency

Selector lever

Brake pedal operation 

condition

Engine is running 

→

 ACC 

—

—

Emergency stop operation

Engine stall return operation while 
driving 

N position

Not depressed

1

SYSTEM

SEC-15

< SYSTEM DESCRIPTION >

[WITH INTELLIGENT KEY SYSTEM]

C

D

E

F

G

H

I

J

L

M

A

B

SEC

N

O

P

INFINITI VEHICLE IMMOBILIZER SYSTEM-NATS : System Diagram

INFOID:0000000006226180

INFINITI VEHICLE IMMOBILIZER SYSTEM-NATS : System Description

INFOID:0000000006226181

SYSTEM DESCRIPTION

• The INFINITI VEHICLE IMMOBILIZER SYSTEM-NATS [IVIS (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 IVIS (NATS) ID verification is performed between the transponder integrated with 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 igni-
tion switch operation.

• Locate the security indicator lamp and apply the anti-theft system equipment sticker that warns that the IVIS

(NATS) is on board the model.

• Security indicator lamp always blinks when the power supply position is any position other than ON.
• 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 registration proce-

dures, refer to CONSULT-III Operation Manual NATS-IVIS/NVIS.

• Possible symptom of IVIS (NATS) malfunction is “Engine cannot start”. The engine can not be started

because of other than IVIS (NATS) malfunction, so start the trouble diagnosis according to 

SEC-48, "Work

Flow"

.

• If ECM other than genuine part is installed, the engine cannot be started. For ECM replacement procedure,

refer to 

EC-143, "Work Procedure"

.

JMKIA5734GB

SEC-16

< SYSTEM DESCRIPTION >

[WITH INTELLIGENT KEY SYSTEM]

SYSTEM

PRECAUTIONS FOR KEY REGISTRATION

• The ID registration is a procedure that 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 cus-
tomer.

• When registering the Intelligent Key, perform only one procedure to simultaneously register both ID [IVIS

(NATS) ID and Intelligent Key ID].

SECURITY INDICATOR LAMP

• Warns that the vehicle is equipped with IVIS (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 IG-
NITION SWITCH

1.

When brake pedal is depressed while selector lever is in the P position, 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 IVIS (NATS) ID verification between BCM and Intelligent Key (transponder built-in) via NATS
antenna amp.

3.

When the IVIS (NATS) ID verification result is OK, buzzer in combination meter sounds and BCM trans-
mits 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 and supplies power supply 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 and stops 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 and starts the ignition power supply.

11. BCM detects that the selector lever position is P or N.
12. 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.

13. IPDM E/R turns the starter control relay ON when receiving the starter request signal.
14. Power supply is supplied through the starter relay and the starter control relay to operate the starter motor.

15. When BCM receives feedback signal from ECM indicating that the engine is started, BCM transmits a

stop signal to IPDM E/R and stops cranking by turning off the starter motor relay. (If engine start is unsuc-
cessful, 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, 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

Vehicle speed: less than 4 km/h (2.5 MPH)

SYSTEM

SEC-17

< SYSTEM DESCRIPTION >

[WITH INTELLIGENT KEY SYSTEM]

C

D

E

F

G

H

I

J

L

M

A

B

SEC

N

O

P

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

Emergency stop operation

• Press and hold the push-button ignition switch for 2 seconds or more.

• Press the push-button ignition switch 3 times or more within 1.5 seconds.

VEHICLE SECURITY SYSTEM

VEHICLE SECURITY SYSTEM : System Diagram

INFOID:0000000006226184

Power supply position

Engine start/stop condition

Push-button ignition switch 

operation frequency

Selector lever

Brake pedal operation 

condition

LOCK 

→

 ACC

—

Not depressed

1

LOCK 

→

 ACC 

→

 ON

—

Not depressed

2

LOCK 

→

 ACC 

→

 ON 

→

 OFF

—

Not depressed

3

LOCK 

→

 START

ACC 

→

 START

ON 

→

 START

P or N position

Depressed

1

Engine is running 

→

 OFF

—

—

1

Power supply position

Engine start/stop condition

Push-button ignition switch 

operation frequency

Selector lever

Brake pedal operation 

condition

Engine is running 

→

 ACC 

—

—

Emergency stop operation

Engine stall return operation while 
driving 

N position

Not depressed

1

JMKIA5735GB