System Description

SYSTEM DIAGRAM 

Courtesy of NISSAN NORTH AMERICA, INC.

Component		Function
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 (BCM).
Starter motor		Starter motor cranks engine.
Inside key antenna		Inside key antenna detects whether Intelligent Key is inside the vehicle, and transmits the signal to BCM.
Door switch		Door switch detects door switch condition and then transmits door switch signal to BCM.
Remote keyless entry receiver		Remote keyless entry receiver receives each button operation signal and electronic key ID signal from Intelligent Key, and then transmits the signal to BCM.
IPDM E/R		Starter control relay and starter relay are integrated in IPDM E/R, and used for the engine starting function. Starter relay is controlled by BCM, and starter control relay is controlled by IPDM E/R while communicating with BCM. IPDM E/R sends the starter control relay and starter relay status signal to BCM.
BCM		BCM controls INTELLIGENT KEY SYSTEM (ENGINE START FUNCTION). BCM performs the ID verification between BCM and Intelligent Key when the Intelligent Key is carried into the detection area of inside key antenna, and push-button ignition switch is pressed. If the ID verification result is OK, ignition switch operation is available. Then, when the ignition switch is turned ON, BCM performs ID verification between BCM and ECM. If the ID verification result is OK, ECM can start engine.
ECM		ECM controls the engine. When ignition switch is turned ON, BCM starts communication with ECM and performs the ID verification between BCM and ECM. If the verification result is OK, the engine can start. If the verification result is NG, the engine cannot start.
TCU		TCU transmits engine start request signal to BCM when engine start request is received from Infiniti Connection™ date center.
A/T assembly (TCM) (A/T models)		A/T assembly (TCM) transmits the shift position signal to BCM via CAN communication.
Electric shift control module (A/T models)		Electric shift control module detects the selector lever operation. Electric shift control module transmits the P position signal and P/N position signal.
Clutch interlock switch (M/T models)		Clutch interlock switch detects that clutch pedal is depressed, and then transmits ON/OFF signal to BCM.
Park/neutral position switch (M/T models)		Park/neutral position switch transmits P/N position signal.
ABS actuator and electric unit (control unit)		ABS actuator and electric unit (control unit) transmits the vehicle speed signal to BCM via CAN communication. BCM also receives the vehicle speed signal from combination meter via CAN communication. BCM compares both signals to detect the vehicle speed.
Stop lamp switch		Stop lamp switch detects that brake pedal is depressed, and then transmits ON/OFF signal to BCM.
Combination meter		Combination meter transmits the vehicle speed signal to BCM via CAN communication. BCM also receives the vehicle speed signal from ABS actuator and electric unit (control unit) via CAN communication. BCM compares both signals to detect the vehicle speed.
Push-button ignition switch	Push switch	Push-button ignition switch has push switch inside which detects that push-button ignition switch is pressed, and then transmits ON/OFF signal to BCM. BCM change the ignition switch position with the operation of push-button ignition switch. BCM maintains the ignition switch position status while push-button ignition switch is not operated.
	NATS antenna amp.	Refer to NATS Antenna Amp. .

BCM INPUT/OUTPUT SIGNAL CHART 

Input Signal Item 

Transmit unit	Signal name
ECM	CAN communication	ID verification signal Engine status signal
IPDM E/R		Push-button ignition switch status signal Starter relay status signal Starter control relay signal Detention switch signal Interlock/PNP switch signal
Combination meter		Vehicle speed signal
ABS actuator and electric unit (control unit)		Vehicle speed signal
TCM (A/T models)		Shift position signal
TCU		Engine start request signal
Remote keyless entry receiver	Key ID signal
Push-button ignition switch	Push switch signal
Each door switch	Door switch signal
Stop lamp switch	Stop lamp switch signal
Electric shift control module (A/T models)	P position signal
	P/N position signal
Park/neutral position switch (M/T models)	Neutral position signal
Clutch interlock switch (M/T models)	Clutch interlock switch signal

Output Signal Item 

Reception unit	Signal name
Combination meter	CAN communication	Meter display signal
ECM		ID verification signal
Inside key antenna	Inside key antenna 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 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 NATS ID). It can perform the door lock/unlock operation and the push-button ignition switch operation when the registered Intelligent Key is carried.
  NOTE: Refer to System Description for any functions other than engine start function of Intelligent Key system.
• 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 owner.
• For registration of Intelligent Keys, perform procedure according to the instructions displayed on the CONSULT monitor.

PRECAUTIONS FOR INTELLIGENT KEY SYSTEM 

The transponder (the chip for NATS ID verification) is integrated into the Intelligent 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 push-button 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 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. BCM turns ACC relay ON and transmits the 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 the shift position and brake pedal operation condition (A/T models) or clutch pedal operation condition (M/T models).
8. 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.
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 "Intelligent Key system malfunction display" display on information display in combination meter. 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 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".

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, NATS ID verification between transponder in Intelligent Key and BCM is performed when Intelligent Key backside is contacted to push-button ignition switch while brake pedal is depressed. If the verification result is OK, engine can be started.

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				Push-button ignition switch operation frequency
	A/T models		M/T models
	Shift position	Brake pedal operation condition	Shift lever position	Clutch pedal operation condition
OFF → ACC	-	Not depressed	-	Not depressed	1
OFF → ACC → ON	-	Not depressed	-	Not depressed	2
OFF → ACC → ON → OFF	-	Not depressed	-	Not depressed	3
OFF → START/ACC → START/ON → START	P or N position	Depressed	-	Depressed	1
Engine is running → OFF	-	-	-	-	1

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

Power supply position	Condition				Push-button ignition switch operation frequency
	A/T models		M/T models
	Shift position	Brake pedal operation condition	Shift lever position	Clutch pedal operation condition
Engine is running → ACC	-	-	-	-	Emergency stop operation
Engine stall return operation while driving	N position	Not depressed	-	Depressed	1

Emergency stop operation. Emergency engine stop is activated when any of the following operation is performed.

• 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.

REMOTE ENGINE START FUNCTION 

Remote engine start function enables engine to be started from vehicle outside by operating REMOTE ENGINE START button of 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. For details: Refer to System Description .

Engine Start Procedures 

Perform engine start operation using a cellular phone.

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

• All doors are UNLOCK or any door is open.
• Hood is open.
• A registered Intelligent Key is in passenger room.
• Shift position is other than P. (A/T models)
• Sift position is other than neutral position. (M/T models)
• Vehicle security alarm is in operation
• Hazard lamp is in operation.

Engine Stop Procedures 

The following operation enables the engine to be stopped.

• Perform engine stop operation using a cellular phone.
• Push-button 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. (A/T models)
• Shift position is shifted to a position other than neutral position. (M/T models)
• Vehicle security alarm starts to operate.

Operation Area 

The vehicle is within the communication range of the Infiniti Connection™ data center.