System Description

SYSTEM DIAGRAM 

Courtesy of NISSAN

Component		Function
Door switch		Door switch detects door switch condition and then transmits door switch signal to BCM.
Inside key antenna		Inside key antenna detects whether Intelligent Key is inside the vehicle, and transmits the key ID signal to Intelligent Key unit.
Stop lamp switch		Stop lamp switch detects that brake pedal is depressed, and then transmits stop lamp switch signal to BCM.
ABS actuator and electric unit (control unit)		ABS actuator and electric unit (control unit) transmits the vehicle speed signal to BCM via CAN communication.
TCM		TCM receives the P/N position signal from transmission range switch, and then transmits the shift position signal to BCM via CAN communication.
ECM		ECM controls the engine. When ignition switch is placed ON, Intelligent Key unit starts communication with ECM and performs the ID verification between Intelligent Key unit and ECM. If the verification result is OK, the engine can start. If the verification result is NG, the engine cannot start.
IPDM E/R		Starter cut relay is controlled by BCM, and starter relay is controlled by IPDM E/R while communicating with BCM.
BCM		When BCM receives a starter cut relay request signal from ECM, the starter cut relay is placed ON.
Ignition switch	Push switch	Ignition switch has push switch inside which detects that ignition switch is pressed, and then transmits the push switch signal to Intelligent Key unit. Intelligent Key unit changes the ignition switch position with the operation of ignition switch. Intelligent Key unit maintains the ignition switch position status while ignition switch is not operated.
	NATS antenna amp.	NISSAN VEHICLE IMMOBILIZER SYSTEM: Refer to NATS Antenna Amp.  INTELLIGENT KEY SYSTEM: Refer to Inside Key Antenna .
Intelligent Key		The Intelligent Key system is a system that makes it possible to lock and unlock the door locks (door lock/unlock function) by carrying the Intelligent Key, which operates based on the results of electronic ID verification using two-way communication between the Intelligent Key and the vehicle (Intelligent Key unit).
Intelligent Key unit		Intelligent Key unit controls INTELLIGENT KEY SYSTEM (ENGINE START FUNCTION) Intelligent Key unit performs the ID verification between Intelligent Key unit and Intelligent Key when the Intelligent Key is carried into the detection area of inside key antenna, and ignition switch is pressed. If the ID verification result is OK, ignition switch operation is available. Then, when the ignition switch is placed ON, Intelligent Key unit performs ID verification between Intelligent Key unit and ECM. If the ID verification result is OK, ECM can start engine.
TCU		TCU transmits engine start request signal to BCM when engine start request is received from Infiniti Connection™ data center.

BCM INPUT/OUTPUT SIGNAL CHART 

Input Signal Item 

Transmit unit	Signal name
ECM	CAN communication	Engine status signal Starter cut relay request signal
IPDM E/R		Ignition ON signal Starter cut relay status signal Neutral position signal
ABS actuator and electric unit (control unit)		Vehicle speed signal
TCM		Shift position signal
TCU		Engine start request signal
Each door switch	Door switch signal
Stop lamp switch	Stop lamp switch signal

Output Signal Item 

Reception unit	Signal name
IPDM E/R	CAN communication	Ignition ON signal

INTELLIGENT KEY UNIT INPUT/OUTPUT SIGNAL CHART 

Input Signal Item 

Transmit unit	Signal name
IPDM E/R	CAN communication	Ignition ON signal

Output Signal Item 

Reception unit	Signal name
IPDM E/R	CAN communication	Ignition ON signal
Inside key antenna	Key ID request signal

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 Intelligent Key unit and Intelligent Key when the 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 have ID (Key ID). It can perform the door lock/unlock operation and the ignition switch operation when the registered Intelligent Key is carried.
• If the ID is successfully verified, when ignition switch is pressed, engine can be started.
• Up to 4 Intelligent Keys can be registered (Including the standard Intelligent Key) upon request from the customer.
  NOTE: For any functions other than engine start function of Intelligent Key system. Refer to System Description .

PRECAUTIONS FOR INTELLIGENT KEY SYSTEM 

The transponder (the chip for NATS ID verification) is integrated into the Intelligent Key. It is integrated into the mechanical key. Therefore, ID verification cannot be performed by mechanical key only. In that case, NATS ID verification can be performed when Intelligent Key backside is contacted to ignition switch while brake pedal is depressed. If verification result is OK, engine can be started.

OPERATION WHEN INTELLIGENT KEY IS CARRIED 

1. When the ignition switch is pressed, the Intelligent Key unit 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 NATS ID signal to the Intelligent Key unit.
3. Intelligent Key unit receives the NATS ID signal verifies it with the registered ID.
4. When the ignition switch is placed to ON, Intelligent Key unit performs ID verification with the ECM. When the result is OK, engine start is permitted.
5. When ECM detects that the start engine conditions* are satisfied, it transmits a starter cut relay request signal to BCM.
6. When BCM receives a starter cut relay request signal from ECM, the starter cut relay is placed ON.
7. When starter cut relay is placed ON, IPDM E/R turns ON the starter relay and drives the starter motor.
8. When BCM receives an engine status signal from ECM, it turns the starter relay and starter cut relay OFF and stops cranking.
   CAUTION:

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

*: For the engine start condition, refer to "IGNITION SWITCH 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.

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

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

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

Power supply position	Condition		Ignition switch operation frequency
	Selector lever	Brake pedal operation condition
OFF → ON	-	Not depressed	1
OFF → ON → OFF	-	Not depressed	2
OFF → 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	Condition		Ignition switch operation frequency
	Selector lever	Brake pedal operation condition
Engine is running → OFF	-	-	Emergency stop operation
Engine stall return operation while driving	N position	Not depressed	1

Emergency stop operation

• Press and hold the ignition switch for 2 seconds or more.
• Press the ignition switch 3 times or more within 1.5 seconds.

REMOTE ENGINE START FUNCTION 

Remote engine start function enables engine to be started from vehicle outside by operating remote engine start button of Intelligent Key or cellular phone. In the same way as the Intelligent Key, the engine can be started by operating a cellular phone using the Telematics system function.

Engine Start Procedures 

The following operation enables the engine to be started:

• Press LOCK button of Intelligent Key, and then within 5 seconds, press and hold remote engine start button of Intelligent Key for 2 seconds or more.
• Perform engine start operation using a cellular phone.

Engine does not start while the vehicle is in the following status:

• All doors are UNLOCKED or any door is open.
• Hood is open.
• A registered Intelligent Key is in passenger room.
• Shift position is other than P.
• Vehicle security alarm is in operation.
• Hazard lamp is in operation.

Engine Stop Procedures 

The following operation enables the engine to be stopped:

• Press remote engine start button of Intelligent Key.
• Perform engine stop operation using a cellular phone.
• Ignition switch is operated.

Engine stops when the vehicle status changes to the following status:

• 10 minutes are passed since engine start.
• Hood is open.
• Shift position is shifted to a position other than P.
• Vehicle security alarm starts to operate.

Operation Area 

The engine can be started when the vehicle is under the following conditions.

• The remote engine start operating range is approximately 60 m (197 ft.) from the vehicle.
• The vehicle is within the communication range of the NissanConnect™ data center.