Operation CHARM: Car repair manuals for everyone.
Home >> Nissan-Datsun >> 2008 >> Versa L4-1.8L (MR18DE) >> Repair and Diagnosis >> Body and Frame >> Locks >> Keyless Entry >> Description and Operation >> Intelligent Key System

Intelligent Key System

INTELLIGENT KEY SYSTEM

System Description
- The Intelligent Key system is a system that makes it possible to lock and unlock the door locks (door lock/ unlock function), and start the engine (engine start function) by carrying around the Intelligent Key (without some key operation), which operates based on the results of electronic ID verification using two-way communications between the Intelligent Key and the vehicle (Intelligent Key unit).
- Vehicles equipped with a manual transmission include a key interlock solenoid located in the steering column to prevent accidental shut-off of the ignition switch and locking of the steering wheel during driving condition when the vehicle is moving.

CAUTION: The driver should always carry the Intelligent Key

- Operation of the remote controller buttons on the Intelligent Key also provides the same functions as the remote control entry system. (Remote keyless entry functions)
- If an action that does not meet the operating conditions of the Intelligent Key system is taken, the buzzer goes off to inform the driver. (Warning chime functions)
- When a door lock is locked or unlocked with request switch or remote controller button operation, the hazard lamps flash and the buzzer (outside vehicle) sounds (Hazard and buzzer reminder function).
- Even if the Intelligent Key battery is completely discharged, the door locks can be locked and unlocked and the engine started with the mechanical key built into the Intelligent Key.
- The settings for each function can be changed with the CONSULT-III.
- If an Intelligent Key is lost, a new Intelligent Key can be registered. A maximum of 4 Intelligent Keys can be registered.
- It has been made possible to diagnose the system and register an Intelligent Key with the CONSULT-III.

DOOR LOCK/UNLOCK FUNCTION
Only when pressing the request switch, it is possible to lock and unlock the door by carrying around the Intelligent Key (without some key operation).




System Diagram

Operation Description
- When the Intelligent Key unit detects that each request switch is pressed, it starts the outside key antenna and inside key antenna corresponding to the pressed request switch and sends the request signal to the Intelligent Key. And then, make sure that the Intelligent Key is near door.
- If the Intelligent Key is within the outside key antenna detection area, it receives the request signal and sends the key ID signal to the Intelligent Key unit.
- Intelligent Key unit receives the key ID signal and compares it with the registered key ID.
- If the key ID check result is OK, the Intelligent Key unit sends the door lock/unlock request signal to BCM (Body control module) via CAN communication line.
- Intelligent Key unit sends the door lock/unlock signal and sounds Intelligent Key warning buzzer (lock: 2 times, unlock: 1 time) at the same time.
- When BCM receives the door lock/unlock signal, it operates door lock actuator and flashes the hazard warning lamp (lock: 2 times, unlock: 1 time) at the same time as reminder.




Operation Condition
If the following conditions are not satisfied, door lock/unlock operations are not performed even if the request switch is operated.

Outside Key Antenna Detection Area
The outside key antenna detection area of door lock/unlock function is in the range of approximately 80 cm (31.50 in) surrounding the request switch (driver side, passenger side and back door or trunk area).

Hazard and Buzzer Reminder
When all doors and trunk (sedan) are locked or unlocked by each request switch, Intelligent Key unit sends hazard request signal to BCM via CAN communication line.
BCM flashes hazard warning lamps as a reminder and Intelligent Key unit sounds Intelligent Key warning buzzer(s) as a reminder.




Operating function of hazard and buzzer reminder

Auto Door Lock Function
When all doors and trunk (sedan) are locked, ignition knob switch is OFF (when ignition switch is not pressed) and key switch is OFF (when mechanical key is out of ignition key cylinder), all doors are unlocked with each request switch.
When Intelligent Key unit does not receive the following signals within 1 minute, all doors are locked.
- Door switch is ON (door is opened)
- Trunk lamp switch (sedan) is ON (trunk is opened)
- Door lock signal from Intelligent Key button
- Ignition knob switch is ON (ignition switch is pressed)
- Key switch is ON (mechanical key is inserted in ignition key cylinder)

Auto door lock mode can be changed by "AUTO RELOCK TIMER" mode in "WORK SUPPORT". Refer to "CONSULT-III Application Item".




List of Operation Related Parts




KEY REMINDER FUNCTION

CAUTION:
- The above function operates when the Intelligent Key is inside the vehicle. However, there may be times when the Intelligent Key cannot be detected, and this function will not operate when the Intelligent Key is on the instrument panel, rear parcel shelf or in the glove box. Also, this system sometimes does not operate if the Intelligent Key is in the door pocket of an open door.




List of Operation Related Parts

REMOTE KEYLESS ENTRY FUNCTIONS
The Intelligent Key has the same functions as the remote keyless entry system. Therefore, it can be used in the same manner as the keyfob by operating the door lock/unlock button.




System Diagram

Door Lock/Unlock Function
- When door lock/unlock button of the Intelligent Key is pressed, lock signal or unlock signal is sent from Intelligent Key to Intelligent Key unit.
- Intelligent Key unit sends the door lock/unlock request signal to BCM via CAN communication line.
- Intelligent Key unit sends the door lock/unlock signal and sounds Intelligent Key warning buzzer(s) (lock: 2 times, unlock: 1 time) at the same time.
- When BCM receives the door lock/unlock signal, it operates door lock actuator and flashes the hazard warning lamp (lock: 2 times, unlock: 1 time) at the same time as reminder.




Operation Condition

Hazard and Buzzer Reminder
When all doors are locked or unlocked by Intelligent Key button, Intelligent Key unit sends hazard request signal to BCM via CAN communication line.
BCM flashes hazard warning lamps as a reminder and Intelligent Key unit sounds Intelligent Key warning buzzer as a reminder.




Operating function of hazard and buzzer reminder

Auto Door Lock Function
When all doors are locked, ignition knob switch is OFF (when ignition switch is not pressed) and key switch is OFF (when mechanical key is out of ignition key cylinder), doors are unlocked with Intelligent Key button.
When Intelligent Key unit does not receive the following signals within 1 minute, all doors are locked.
- Door switch is ON (door is opened)
- Trunk lamp switch (sedan) is ON (trunk is opened)
- Door is locked
- Ignition knob switch is ON (ignition switch is pressed)
- Key switch is ON (mechanical key is inserted in ignition switch)

Auto door lock mode can be changed by "AUTO RELOCK TIMER" mode in "WORK SUPPORT". Refer to "CONSULT-III Application Item".

Panic Alarm Function
When ignition knob switch is OFF (ignition switch is not pressed), or key switch is OFF (mechanical key is not inserted in key cylinder), pressing and holding the panic alarm button on Intelligent Key will send a panic alarm signal to Intelligent Key unit.
Intelligent Key unit sends alarm request signal to BCM via CAN communication line.

BCM sends headlamp request signal and horn signal to IPDM E/R. Then, IPDM E/R turns on and off headlamp and horn intermittently.
The headlamp flashes and the horn sounds intermittently.
The alarm automatically turns off:
- After 25 seconds
- When Intelligent Key unit receives any signal from remote controller of Intelligent Key
- When door request switch is pressed (Intelligent Key is outside vehicle)

Panic alarm function's press and holding time value can be changed in "PANIC ALARM DELAY" mode in "WORK SUPPORT". Refer to "CONSULT-III Application Item".




List of Operation Related Parts




ENGINE START FUNCTION
When ignition knob switch is ON (press ignition switch), Intelligent Key unit searches Intelligent Key in the vehicle using inside key antenna.
Then Intelligent Key is inside the vehicle, it performs the following operation.
- Illuminate green "KEY" warning lamp in combination meter.
- Released steering lock and ignition switch can be turned from OFF to ACC, ON or START position.

NOTE: If Intelligent Key is not registered, "KEY" warning lamp in combination meter illuminates red.

- Intelligent Key sends engine start signal to BCM via CAN communication line.

When ignition switch turns to START position, BCM sends starter request signal to IPDM E/R. Then, engine starts.
Even if Intelligent Key battery runs down, Intelligent key unit can start engine with mechanical key built Intelligent Key. For details, refer to NATS (NISSAN ANTI-THEFT SYSTEM).
All of the originally supplied Intelligent Key IDs (except for key) have been registered in Intelligent Key system.
If requested by the vehicle owner, a maximum of four Intelligent Key IDs can be registered into the Intelligent Key system components.




List of Operation Related Parts

WARNING CHIME/BUZZER/LAMPS FUNCTION

Operation Description
The following warning chime (combination meter), Intelligent Key warning buzzer (front door LH), Intelligent

Key warning buzzer (trunk)*, warning lamps "KEY" and "P-SHIFT" (with CVT) or "LOCK" (with M/T) are given to the user as warning information while using the intelligent key system.
- Ignition switch warning chime
- Ignition key warning chime
- OFF position warning chime
- Take away warning chime
- Door lock operation warning chime
- Intelligent key low battery warning
- P position warning (with CVT)
- LOCK position warning (with M/T)

NOTE: For key-in-ignition warning chime related concerns only.
* : Sedan







Operation Condition




List of Operation Related Parts

CHANGE SETTINGS FUNCTION
The settings for each function can be changed with the CONSULT-III.

Changing Settings Using CONSULT-III
The settings for the Intelligent Key system functions can be changed using CONSULT-III (WORK SUPPORT).
Refer to "CONSULT-III Application Item".

NOTE: Once a function setting is changed, it will remain effective even if the battery is disconnected.

INTELLIGENT KEY REGISTRATION
Intelligent Key-ID registration is performed using the CONSULT-III.

CAUTION:
- After a new Intelligent Key-ID is registered, be sure to check the function.
- When registering an additional Intelligent Key-ID, take any Intelligent Keys already registered and Intelligent Keys for any other vehicles out of the vehicle before starting.

CONSULT-III can be used to check and delete Intelligent Key-IDs.
For further information, see the CONSULT-III Operation Manual NATS.

STEERING LOCK SOLENOID REGISTRATION

Steering Lock Solenoid ID Registration

CAUTION:
- The method for registering a steering lock solenoid ID depends on the status of the steering lock solenoid and Intelligent Key unit (new or old unit).
- After registration is completed, press ignition switch with an Intelligent Key in the vehicle so that it can be turned, and confirm that it cannot be turned even when ignition switch is pressed without an Intelligent Key in the vehicle.

For further information, see the CONSULT-III Operation Manual NATS-IVIS/NVIS.

CAN Communication System Description
Refer to Information Bus.

Intelligent Key System Schematic (Part 1):




Intelligent Key System Schematic (Part 2):




Schematic
pro multis · About Operation CHARM