System Description

SYSTEM DIAGRAM 

Courtesy of NISSAN

INPUT SIGNAL AND OUTPUT SIGNAL CHART (CAN COMMUNICATION) 

Signal name	Input	Output	Description
Inside key antenna signal	ECM TCM IPDM E/R	BCM	Inputs the key ID signal and transmits the engine start signal to the IPDM E/R via CAN communication
ID verification signal	ECM TCM IPDM E/R	BCM	Inputs the ID verification signal via CAN communication
Engine status signal	BCM TCM IPDM E/R Combination meter ABS actuator and electric unit	ECM	Inputs the engine status signal via CAN communication
Push-button ignition switch status signal	ECM TCM IPDM E/R Combination meter ABS actuator and electric unit	BCM	Inputs the push-button ignition switch status signal via CAN communication
Shift position signal	ECM TCM IPDM E/R Combination meter ABS actuator and electric unit	BCM	Inputs the shift position signal via CAN communication
Vehicle speed signal	ECM TCM IPDM E/R Combination meter BCM	ABS actuator and electric unit	Inputs the vehicle speed signal via CAN communication
Door switch signal	IPDM E/R Combination meter	BCM	Inputs the door switch signal via CAN communication

SYSTEM DESCRIPTION 

• The engine start function of Intelligent Key system makes it possible to start and stop the engine without using the key, based on the electronic ID verification. The electronic ID verification is performed between BCM and Intelligent Key when the push-button ignition switch is pressed, while the Intelligent Key is within the detection area of inside key antenna.
  NOTE: The driver should carry the Intelligent Key at all times.
• Intelligent Key has 2 IDs [Intelligent Key ID and IVIS (NATS) ID]. It can perform the door lock/unlock operation and the push-button ignition switch operation when the registered Intelligent Key is carried.
• When Intelligent Key battery is discharged, engine can be started by operating push-button ignition switch after contacting Intelligent Key backside to push-button ignition switch. At that time, the IVIS (NATS) ID verification is performed.
• If the ID is successfully verified, when push-button ignition switch is pressed, the engine can be started.
• Up to 4 Intelligent Keys can be registered (Including the standard Intelligent Key) upon request from the customer.
• For initialization and registration of Intelligent Key, refer to CONSULT Immobilizer mode and follow the on-screen instructions.
  NOTE: Refer to System Description for any functions other than engine start function of Intelligent Key system.

PRECAUTIONS FOR INTELLIGENT KEY SYSTEM 

The transponder [the chip for IVIS (NATS) ID verification] is integrated into the Intelligent Key. In that case, the IVIS (NATS) ID verification can be performed when Intelligent Key backside is contacted to push-button ignition switch. If verification result is OK, engine can be started.

OPERATION WHEN INTELLIGENT KEY IS CARRIED 

1. When the push-button ignition switch is pressed, the BCM activates the inside key antenna and transmits the request signal to the Intelligent Key.
2. The Intelligent Key receives the request signal and transmits the Intelligent Key ID signal to the BCM.
3. BCM receives the Intelligent Key ID signal via remote keyless entry receiver and verifies it with the registered ID.
4. Push-button ignition switch transmits the ignition power supply ON signal to IPDM E/R.
5. IPDM E/R turns the ignition relay-1 ON and starts the ignition power supply.
6. BCM detects the selector lever position and brake pedal operating condition.
7. BCM transmits the 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.
8. IPDM E/R turns the starter control relay ON when receiving the starter request signal.
9. Power supply is supplied through the starter relay and the starter control relay to operate the starter motor.
   CAUTION:

   If a malfunction is detected in the Intelligent Key system, the "KEY" warning lamp in the combination meter illuminates. At that time, the engine cannot be started.

10. When BCM receives feedback signal from ECM indicating that the engine is started, the BCM transmits a stop signal to IPDM E/R and stops cranking by turning OFF the starter relay (If engine start is unsuccessful, cranking stops automatically within 5 seconds).
    CAUTION:

    When the Intelligent Key is carried outside of the vehicle (inside key antenna detection area) while the power supply is in the ACC or ON position, even if the engine start condition* is satisfied, the engine cannot be started.

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

OPERATION RANGE 

Engine can be started when Intelligent Key is inside the vehicle. However, sometimes engine may not start when Intelligent Key is on instrument panel or in glove box.

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

When Intelligent Key battery is discharged, the IVIS (NATS) ID verification between transponder in Intelligent Key and BCM is performed when Intelligent Key backside is contacted to push-button ignition switch. If the verification result is OK, engine can be started.

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

The power supply position changing operation can be performed with the following operations:

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

Power supply position	Engine start/stop condition		Push-button ignition switch operation frequency
	Selector lever	Brake pedal operation condition
LOCK -> ACC	-	Not depressed	1
LOCK -> ACC -> ON	-	Not depressed	2
LOCK -> ACC -> ON -> OFF	-	Not depressed	3
LOCK -> START/ACC -> START/ON -> START	P or N position	Depressed	1
Engine is running -> OFF	-	-	1

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

Power supply position	Engine start/stop condition		Push-button ignition switch operation frequency
	Selector lever	Brake pedal operation condition
Engine is running -> ACC	-	-	Emergency stop operation
Engine stall return operation while driving	N position	Not depressed	1

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.