Nissan Sentra. Manual — part 778
SEC-140
< SYSTEM DESCRIPTION >
[WITHOUT INTELLIGENT KEY SYSTEM]
COMPONENT PARTS
Key switch
Input key switch ON/OFF condition to BCM.
Horn
Provides audible warning in panic mode.
Item
Function
SYSTEM
SEC-141
< SYSTEM DESCRIPTION >
[WITHOUT INTELLIGENT KEY SYSTEM]
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SYSTEM
NISSAN VEHICLE IMMOBILIZER SYSTEM-NATS
NISSAN VEHICLE IMMOBILIZER SYSTEM-NATS : System Diagram
INFOID:0000000009756797
NISSAN VEHICLE IMMOBILIZER SYSTEM-NATS : System Description
INFOID:0000000009756798
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 anyone 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)
• Therefore, NATS warns outsiders that the vehicle is equipped with the anti-theft system.
• 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.
• 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
EC-485, "Removal and Installation"
.
PRECAUTIONS FOR KEY REGISTRATION
ALKIA2974GB
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
SEC-142
< SYSTEM DESCRIPTION >
[WITHOUT INTELLIGENT KEY SYSTEM]
SYSTEM
• 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 procedure, col-
lect 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 parts.
If ID registration is mot performed the electrical system may not operate properly.
• BCM
• ECM
• IPDM E/R
• Ignition key
• NATS antenna amp.
• Dongle unit (Canada only)
• Combination meter
VEHICLE SECURITY SYSTEM
VEHICLE SECURITY SYSTEM : System Diagram
INFOID:0000000009756799
VEHICLE SECURITY SYSTEM : System Description
INFOID:0000000009756800
• The vehicle security system has two alarm functions (theft warning alarm and panic alarm), and reduces the
possibility of a theft or mischief by activating horns and headlamps intermittently.
• The panic alarm does not start when the theft warning alarm is activating, and the panic alarm stops when
the theft warning alarm is activated.
ALKIA2985GB
SYSTEM
SEC-143
< SYSTEM DESCRIPTION >
[WITHOUT INTELLIGENT KEY SYSTEM]
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The priority of the functions are as per the following.
THEFT WARNING ALARM
• The theft warning alarm function activates horns and headlamps intermittently when BCM detects that any
door is opened by unauthorized means, while the system is in the ARMED state.
• Security indicator lamp on combination meter always blinks when ignition switch is in any position other than
ON. Security indicator lamp blinking warns that the vehicle is equipped with a vehicle security system.
Operation Flow
Priority
Function
1
Theft warning alarm
2
Panic alarm
JMKIA5416GB
No.
System state
Switching condition
1
DISARMED to
PRE-ARMED
When all conditions of A and
one condition of B is satis-
fied.
A
B
• Ignition switch: OFF
• All doors: Closed
All doors are locked by:
• Door key cylinder LOCK switch
• LOCK button of Keyfob
• Door lock and unlock switch
2
PRE-ARMED
to ARMED
When all of the following
conditions are satisfied for
30 seconds.
• Ignition switch: OFF
• All doors: Locked
3
ARMED to
ALARM
When all conditions of A and
B are satisfied.
A
B
Keyfob: Not used
• Any door: Open
4
DISARMED to
PRE-RESET
No conditions.
5
PRE-ARMED
to PRE-RESET
6
ARMED to
PRE-RESET
7
ALARM to
PRE-RESET
8
PRE-RESET to
DISARMED
9
PRE-RESET to
PRE-ARMED
10
PRE-ARMED
to DISARMED
When one of the following
condition is satisfied.
• Ignition switch: ACC/ON
• Door key cylinder UNLOCK switch: ON
• UNLOCK button of Keyfob: ON
• UNLOCK switch of door lock and unlock switch: ON
• Any door: Open
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