Nissan Frontier D40. Manual — part 963
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< FUNCTION DIAGNOSIS >
NVIS (NISSAN VEHICLE IMMOBILIZER SYSTEM-NATS)
FUNCTION DIAGNOSIS
NVIS (NISSAN VEHICLE IMMOBILIZER SYSTEM-NATS)
System Diagram
INFOID:0000000005272577
System Description
INFOID:0000000005272578
INPUT/OUTPUT SIGNAL CHART
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 5 keys.
• During trouble diagnosis or when the following parts have been replaced, and if ignition key is added, regis-
tration
*1
is required.
*1
: All keys kept by the owner of the vehicle should be registered with mechanical key.
- ECM
- BCM
- Ignition key
- Remote keyless entry receiver
• 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.
PIIA1121E
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
NVIS (NISSAN VEHICLE IMMOBILIZER SYSTEM-NATS)
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• 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-7, "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 key is necessary for this procedure. Before starting the registration operation collect
all registered 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 key ID registration is the procedure that registers the ID to the BCM.
• When performing the 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 ignition
key.
SECURITY INDICATOR
• Always flashes with ignition key in the OFF 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.
• BCM
• ECM
• IPDM E/R
• Ignition key
• NATS antenna amp.
• Combination meter
Component Parts Location
INFOID:0000000005272579
LIIA2428E
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< FUNCTION DIAGNOSIS >
NVIS (NISSAN VEHICLE IMMOBILIZER SYSTEM-NATS)
Component Description
INFOID:0000000005272580
1.
NATS antenna amp. M21
(view with cluster lid A removed)
2.
BCM M18, M20
(view with lower instrument panel LH
removed)
3.
ECM E16
4.
IPDM E/R E121
5.
Combination meter M24
Item
Function
BCM
Verifies the received signal from the ignition key ID, then informs ECM whether to allow engine start.
Remote keyless entry receiver
Receives lock/unlock signal from the keyfob, and then transmits to the BCM.
A/T shift selector (detention key
switch)
Detects whether the shift lever is in park.
NATS antenna amp.
Detects the ignition key presence in the ignition key cylinder.
Security indicator
Indicates the status of the security system.
IPDM E/R
Powers-up the horn and the headlamps in case of a security breach.
VEHICLE SECURITY SYSTEM
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VEHICLE SECURITY SYSTEM
System Diagram
INFOID:0000000005272581
System Description
INFOID:0000000005272582
DESCRIPTION
The security system provides an audible and visual alarm when an unauthorized access to the vehicle is
detected while the system is in armed phase.
The security system consist of the BCM managing the audible alarm (horn) and the visual alarm (headlamps).
OPERATION FLOW
Disarmed Phase
When the vehicle is being driven or when doors are open, the theft warning system is set in the disarmed
phase on the assumption that the owner is inside or near the vehicle.
Pre-Armed Phase And Armed Phase
The vehicle security system turns into the pre-armed phase when ignition switch is in OFF position, all doors
are closed and locked (using keyfob, doorlock/unlock switch, driver key cylinder or auto relock function). The
system automatically shifts into the armed phase.
Condition of Activating The System
When the following condition is performed in armed phase, the system sounds the horns and flashes the
headlamps for approximately 50 seconds.
• Any door is opened.
ALKIA0952GB
PIIA1367E
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