Toyota
Nissan Versa
 Sedan Service Manual
Body exterior, doors, roof & vehicle security » Security control system (SEC)
Nissan anti-theft system

NISSAN ANTI-THEFT SYSTEM : System Description

SYSTEM DIAGRAM

SYSTEM DIAGRAM

SYSTEM DESCRIPTION

  • The Nissan Anti-Theft System (NATS) prevents the engine from being started by Intelligent Key whose ID is not registered to the vehicle (BCM). It has higher protection against auto theft involving the duplication of mechanical keys.
  • The ignition key integrated in the Intelligent Key cannot start the engine. When the Intelligent Key battery is discharged, the NATS ID verification is performed between the transponder integrated with Intelligent Key and BCM via NATS antenna amp. when the Intelligent Key backside is contacted to push-button ignition switch while brake pedal is depressed. If the verification result is OK, the engine start operation can be performed by the push-button ignition switch operation.
  • Locate the security indicator lamp and always blinks it when the ignition switch is in any position except ON to warn that the vehicle is equipped with Nissan Anti-Theft System (NATS).
  • Up to 4 Intelligent Keys can be registered (including the standard ignition key) upon request from the owner.
  • When replacing ECM, BCM or Intelligent Key, the specified procedure (Initialization and registration) using CONSULT is required.
  • Possible symptom of NATS malfunction is "Engine can not start". This symptom also occurs because of other than NATS malfunction, so start the trouble diagnosis according to SEC "Work Flow".
  • If ECM other than genuine part is installed, the engine cannot be started.

    For ECM replacement procedure, refer to EC "Removal and Installation".

PRECAUTIONS FOR KEY REGISTRATION

  • The ID registration is a procedure that erases the current NATS ID once, and then registers a new ID. Therefore before starting the registration operation, collect all registered Intelligent Keys from the customer.
  • When registering the Intelligent Key, perform only one procedure to simultaneously register both IDs (NATS ID and Intelligent Key ID).

SECURITY INDICATOR LAMP

  • Security indicator lamp warns that the vehicle is equipped with NATS.
  • Security indicator lamp always blinks when the ignition switch is in any position other than ON.

NOTE: Because security indicator lamp is highly efficient, the battery is barely affected.

ENGINE START OPERATION WHEN INTELLIGENT KEY IS CONTACTED TO PUSH-BUTTON IGNITION SWITCH

  1. When brake pedal is depressed while selector lever is in the P position the BCM activates NATS antenna amp. that is located behind push-button ignition switch.
  2. When Intelligent Key (transponder built-in) backside is contacted to push-button ignition switch, BCM starts NATS ID verification between BCM and Intelligent Key (transponder built-in) via NATS antenna amp.
  3. When NATS ID verification result is OK, buzzer in combination meter sounds and BCM transmits the result to ECM.
  4. BCM turns ACC relay ON and transmits ignition power supply ON signal to IPDM E/R.
  5. IPDM E/R turns the ignition relay ON and starts the ignition power supply.
  6. IPDM E/R turns the starter control relay ON for engine starting in advance.
  7. BCM detects that the selector lever position and brake pedal operation condition.
  8. BCM transmits starter request signal to IPDM E/R and turns the starter relay in IPDM E/R ON if BCM judges that the engine start condition* is satisfied.
  9. Power supply is supplied through the starter relay and the starter control relay to operate the starter motor.
  10. When BCM receives feedback signal from ECM indicating that the engine is started, BCM transmits a stop signal to IPDM E/R and stops cranking by turning off the starter motor relay. (If engine start is unsuccessful, cranking stops automatically within 5 seconds.)

*: For the engine start condition, refer to "IGNITION SWITCH POSITION CHANGE TABLE BY PUSH-BUTTON IGNITION SWITCH OPERATION" below.

IGNITION SWITCH POSITION CHANGE TABLE BY PUSH-BUTTON IGNITION SWITCH OPERATION

The ignition switch position can be changed by the following operations.

NOTE:

  • When an Intelligent Key is within the detection area of inside key antenna or when Intelligent Key backside is contacted to push-button ignition switch, it is equivalent to the operations below.
  • When starting the engine, the BCM monitors under the engine start conditions,
  • Brake pedal operation condition
  • Selector lever position
  • Vehicle speed

Vehicle speed: less than 4 km/h (2.5 MPH)               

Vehicle speed: 4 km/h (2.5 MPH) or more                               

Emergency stop operation

  • Press and hold the push-button ignition switch for 2 seconds or more.
  • Press the push-button ignition switch 3 times or more within 1.5 seconds.
    More about «Security control system (SEC)»:

    Precautions

    Component parts Component parts Component parts

    Intelligent key system/engine start function

    Nissan anti-theft system

    Vehicle security system

    Diagnosis system (BCM)

    Diagnosis and repair work flow

    Additional service when replacing control unit

    P1610 Lock mode

    P1611 ID Discord, IMMU-ECM

    P1612 Chain of ECM-IMMU

    B2192 ID discord, IMMU-ECM

    B2193 Chain of ECM-IMMU

    B2195 Anti-scanning

    B2196 Dongle unit

    B2198 NATS antenna AMP

    B2555 Stop lamp

    B2556 Push-button ignition switch

    B2557 Vehicle speed

    B2601 Shift position

    B2602 Shift position

    B2603 Shift position

    B2604 Shift position

    B2605 Shift position

    B2608 Starter relay

    B260F Engine status

    B26F3 Starter control relay

    B26F4 Starter control relay

    B26F7 BCM

    B26FC Key registration

    B210B Starter control relay

    B210C Starter control relay

    B210D Starter relay

    B210E Starter relay

    B210F Shift position/clutch interlock switch

    B2110 Shift position/clutch interlock switch

    Engine does not start when intelligent key is inside of vehicle

    Security indicator lamp does not turn on or blink

    NATS antenna AMP

    Push-button ignition switch

    Remote keyless entry receiver

    Precautions

    Nissan vehicle immobilizer system-NATS

    Diagnosis system (IPDM E/R)

    Diagnosis and repair workflow

    Inspection and adjustment

    U1000 CAN Comm

    U1010 Control unit (CAN)

    P1610 Lock mode

    B2190, P1614 NATS antenna AMP

    B2191, P1615 Difference of key

    B2192, P1611 ID discord, IMMU-ECM

    B2193, P1612 Chain of ECM-IMMU

    B2195 Anti-scanning

    B2196 Dongle unit

    Power supply and ground circuit

    Vehicle security indicator

    Nissan vehicle immobilizer systemnats symptoms

    NATS antenna AMP

    Nissan Versa Sedan Service Manual / Body exterior, doors, roof & vehicle security / Security control system (SEC) / Nissan anti-theft system

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