Infiniti QX56 (JA60). Manual — part 842
SEC-14
< 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
.
• 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
SEC-15
< FUNCTION DIAGNOSIS >
[WITH INTELLIGENT KEY SYSTEM]
C
D
E
F
G
H
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A
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SEC
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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
.
• 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.
SEC-16
< 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
SEC-17
< FUNCTION DIAGNOSIS >
[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
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