Nissan Sentra manuals

Nissan Sentra Service Manual: System description

Component parts

Nissan vehicle immobilizer system-nats

Nissan vehicle immobilizer systemnats : component parts location


  1. Bcm (view with instrument panel removed)
  2. Dongle unit (canada only) (behind instrument panel lh)
  3. Ignition switch
  4. Nats antenna amp.

    (Inside steering column)

  5. Clutch interlock switch (M/T models)
  6. Combination meter
  7. Security indicator lamp
  8. Ipdm e/r
  9. Transmission range switch (cvt models)

Nissan vehicle immobilizer systemnats : component description

Item

Function

Bcm Verifies the received signal from the ignition key id, then informs ecm whether to allow engine start.
Transmission range switch (cvt models) Detects whether the shift lever is in park.
Clutch interlock switch (m/t models) Detects whether the clutch pedal is depressed.
Dongle unit (canada only) Sends id verification signal to the bcm.
Starter relay Supplies battery voltage to the starter motor when enabled.
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 Supplies battery voltage from integrated starter relay to the starter motor.

Vehicle security system

Vehicle security system : component parts location


  1. Bcm (view with instrument panel removed)
  2. Ipdm e/r
  3. Remote keyless entry receiver (view with instrument panel removed)
  4. Front door switch lh (rh similar)
  5. Rear door switch lh (rh similar)
  6. Key switch
  7. Horn relay
  8. Horn

Vehicle security system : component description

Item

Function

Bcm Controls the door lock function.
Door lock and unlock switch Input lock or unlock signal to bcm.
Door switch Input door open/close condition to bcm.
Key switch Input key switch condition to BCM.
Remote keyless entry receiver Receives lock/unlock signal from the keyfob, and then transmits to bcm.
Key switch Input key switch on/off condition to bcm.
Horn Provides audible warning in panic mode.

System

Nissan vehicle immobilizer system-nats

Nissan vehicle immobilizer systemnats : system diagram

Nissan vehicle immobilizer systemnats


Nissan vehicle immobilizer systemnats : system description

Input/output signal chart

Bcm

System description


System description

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

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

PRECAUTIONS FOR KEY REGISTRATION

SECURITY INDICATOR

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.

Vehicle security system

Vehicle security system : system diagram

Vehicle security system : system description


Vehicle security system : system description

The priority of the functions are as per the following.

Theft warning alarm


Theft warning alarm

Operation flow



Note:


Note:

Disarmed phase

The vehicle security system is not set in the disarmed phase. The vehicle security system stays in this phase while any door is open, because it is assumed that the owner is inside or nearby the vehicle. Security indicator lamp blinks every 2.4 Seconds.

When the vehicle security system is reset, each phase switches to the disarmed phase directly.

Pre-armed phase

The PRE-ARMED phase is the transient state between the DISARMED phase and the ARMED phase. This phase is maintained for 30 seconds, so that the owner can reset the setting due to a mis-operation. This phase switches to the ARMED phase when vehicle conditions are not changed for 30 seconds. Security indicator lamp illuminates while being in this phase.

To reset the PRE-ARMED phase, refer to the switching condition of No. 10 in the table above.

Armed phase

The vehicle security system is set, and bcm monitors all necessary inputs. If any door is opened without using keyfob, vehicle security system switches to the alarm phase. Security indicator lamp blinks every 2.4 Seconds.

To reset the armed phase, refer to the switching condition of no. 11 In the table above.

Alarm phase

BCM transmits “Theft Warning Horn Request” signal and “High Beam Request” signal intermittently to IPDM E/R via CAN communication. In this phase, horns and headlamps are activated intermittently for approximately 50 seconds to warn that the vehicle is accessed by unauthorized means. ON/OFF timing of horns and headlamps are synchronized. After 50 seconds, the vehicle security system returns to the ARMED phase. At this time, if BCM still detects unauthorized access to the vehicle, the system is switched to the ALARM phase again. This RE-ALARM operation is carried out a maximum of 2 times.

To cancel the ALARM operation, refer to the switching condition of No. 12 in the table above.

Note:

If a battery terminal is disconnected during the alarm phase, theft warning alarm stops. But when the battery terminal is reconnected, theft warning alarm is activated again.

Pre-reset phase

The pre-reset phase is the transient state between each phase and disarmed phase.

Pre-armed phase is not available for this models.

Panic alarm

Precaution
Precaution for supplemental restraint system (srs) "air bag" and "seat belt pre-tensioner" The supplemental restraint system such as “air bag” and “seat belt pre ...

Diagnosis system (BCM)
Common item Common item : consult function (bcm - common item) Application item Consult performs the following functions via can communication with bcm. Direct diagnostic mode Descripti ...

Other materials:

Body alignment
Body Center Marks A mark has been placed on each part of the body to indicate the vehicle center. When repairing parts damaged by an accident which might affect the vehicle frame (members, pillars, etc.), more accurate and effective repair will be possible by using these marks together with ...

Service data and specifications (SDS)
Wheel Alignment (Unladen*1) UNITED STATES and CANADA *1: Fuel, engine coolant, and lubricants are full. Spare tire, jack, hand tools, and mats are in designated positions. *2: The difference when assuming the (LH) side is the standard. Ball Joint Wheelarch Height (Unladen*) UNITED S ...

Interior room lamp control circuit
Description Controls each interior room lamp (ground side) by pwm signal. Note: Pwm signal control period is approximately 250 hz (in the gradual brightening/dimming). Component function check Caution: Before performing the diagnosis, check that the following are normal. Interior room l ...

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