Infiniti QX56 (JA60). Manual - part 842

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< FUNCTION DIAGNOSIS >

[WITH INTELLIGENT KEY SYSTEM]

INFINITI VEHICLE IMMOBILIZER SYSTEM-NATS

INFINITI VEHICLE IMMOBILIZER SYSTEM-NATS

System Diagram

INFOID:0000000005147071

System Description

INFOID:0000000005147072

INPUT/OUTPUT SIGNAL CHART

Intelligent Key Unit

BCM

SYSTEM DESCRIPTION

NATS (Nissan Anti-Theft System) has the following immobilizer functions:

• Engine immobilizer shows high anti-theft performance to prevent engine from starting by other than the

owner.

• Only a key with key ID registered in BCM and ECM can start engine, and shows high anti-theft performance

to prevent key from being copied or stolen.

• Security indicator always flashes with mechanical key removed condition (key switch: OFF) and ignition

knob released condition on LOCK position (ignition knob switch: OFF). 

• Therefore, NATS warns outsiders that the vehicle is equipped with the anti-theft system. Refer to 

SEC-18,

"System Description"

.

• If system detects malfunction, security indicator illuminates when ignition switch is turned to ON position.

• If the owner requires, ignition key ID or mechanical key ID can be registered for up to 4 keys.

• During trouble diagnosis or when the following parts have been replaced, and if mechanical key is added,

registration* is required. 

*1

: All keys kept by the owner of the vehicle should be registered with mechanical key.

- ECM

- BCM

LIIA2537E

Switch/Input signal

Input signal to BCM

BCM function

Actuator/Output signal

Ignition knob switch

Ignition knob
(push/release)

NATS

• Steering lock solenoid

Key switch

Mechanical key
(Insert/remove)

Steering lock solenoid

Steering
(lock/unlock)

ECM

Engine status signal

Switch/Input signal

Input signal to BCM

BCM function

Actuator/Output signal

NATS antenna amp.

Key ID

NATS

• Security indicator lamp
• Starter request

ECM

Engine status signal

INFINITI VEHICLE IMMOBILIZER SYSTEM-NATS

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< FUNCTION DIAGNOSIS >

[WITH INTELLIGENT KEY SYSTEM]

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- Mechanical key

- Intelligent Key unit

- Remote keyless entry receiver

- Steering lock solenoid

• NATS trouble diagnosis, system initialization and additional registration of other mechanical key IDs must be

carried out using CONSULT-III.

When NATS initialization has been completed, the ID of the inserted mechanical key or mechanical key IDs

can be carried out.

• Possible symptom of NATS malfunction is “Engine cannot start”. Identify the possible causes according to

“Work Flow”, Refer to 

SEC-4, "Work Flow"

.

• If ECM other than Genuine NISSAN is installed, the engine cannot be started. For ECM replacement proce-

dure, refer to 

SEC-9, "ECM RE-COMMUNICATING FUNCTION : Description"

.

PRECAUTIONS FOR KEY REGISTRATION

• The key registration is a procedure that erases the current NATS ID once, and then re-registers a new ID.

Therefore the registered Intelligent Key is necessary for this procedure. Before starting the registration oper-

ation collect all registered Intelligent Keys from the customer.

• The NATS ID registration is the procedure that registers the ID stored into the transponder (integrated in

mechanical key) to BCM.

The Intelligent Key ID registration is the procedure that registers the ID to Intelligent Key unit.

• When performing the Intelligent Key system registration only, the engine cannot be started by inserting the

key into the key cylinder. When performing the NATS registration only, the engine cannot be started by using

the mechanical key.

SECURITY INDICATOR

• Always flashes with ignition knob released (ignition knob switch: LOCK) condition on ignition knob LOCK

position. 

• Always flashes with ignition knob released (ignition knob switch: LOCK) condition on mechanical key

removed position. 

MAINTENANCE INFORMATION

CAUTION:

It is necessary to perform NATS ID registration when replacing any of the following part.

If it's not (or fail to do so), the electrical system may not operate properly.

• Intelligent Key unit 

• BCM

• ECM

• Mechanical key

• Steering lock solenoid

• NATS antenna amp.

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< FUNCTION DIAGNOSIS >

[WITH INTELLIGENT KEY SYSTEM]

INFINITI VEHICLE IMMOBILIZER SYSTEM-NATS

Component Parts Location

INFOID:0000000005147073

Component Description

INFOID:0000000005147074

1.

Key switch and ignition knob switch 
M12

2.

Steering lock solenoid M15
(view with steering column removed)

3.

Remote keyless entry receiver M25
(view with instrument panel RH re-
moved)

4.

BCM M18, M20
(view with instrument panel LH re-
moved)

5.

Intelligent Key unit M70
(view with instrument panel LH re-
moved)

6.

ECM E16

7.

IPDM E/R E119, E120, E122, E124
(view with cover removed)

8.

NATS antenna amp. M21

9.

Combination meter M24

10. Security indicator lamp

ALKIA0959ZZ

Item

Function

Intelligent Key unit

Receives lock/unlock signal from remote keyless entry receiver, and then transmits to BCM.

BCM

Controls the door lock function and room lamp function.

Remote keyless entry receiver

Receives lock/unlock signal from the Intelligent Key, and then transmits to Intelligent Key unit.

Intelligent Key

Transmits button operation to remote keyless entry receiver.

Steering lock solenoid

Locks the steering wheel when the ignition key is off and the Intelligent Key is outside the vehicle.

INFINITI VEHICLE IMMOBILIZER SYSTEM-NATS

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[WITH INTELLIGENT KEY SYSTEM]

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Inside key antenna

Detects if Intelligent Key is inside the vehicle. 

Intelligent Key warning buzzer

Warns the user of the lock/unlock condition and inappropriate operations with the buzzer sound.

Ignition knob switch

Monitors the status of the ignition knob switch.

NATS antenna amp.

Detects the mechanical key presence in the ignition key cylinder.

Security indicator

Indicates the status of the security system.

IPDM E/R

Monitors the ignition switch and the park switch signal from the TCM.

Item

Function