Nissan Pathfinder. Manual - part 1036

COMPONENT PARTS

SEC-7

< SYSTEM DESCRIPTION >

[WITH INTELLIGENT KEY SYSTEM]

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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, push-button ignition switch operation is available.

Then, when the power supply position is turned ON, BCM performs ID verification between BCM and ECM. If

the ID verification result is OK, ECM can start engine.

ECM

INFOID:0000000009175931

ECM controls the engine.

When power supply position is turned ON, BCM starts communication with ECM and performs the ID verifica-

tion between BCM and ECM.

If the verification result is OK, the engine can start. If the verification result is NG, the engine can not start.

IPDM E/R

INFOID:0000000009175932

IPDM E/R has the starter relay and starter control relay inside.  Starter relay and starter control relay are used

for the engine starting function. IPDM E/R controls these relays while communicating with BCM.

NATS Antenna Amp.

INFOID:0000000009175933

The ID verification is performed between BCM and transponder in Intelligent Key via NATS antenna amp.

when Intelligent Key backside is contacted to push-button ignition switch in case that Intelligent Key battery is

discharged. If the ID verification result is OK, the operation of starting engine is available.

Combination Meter

INFOID:0000000009175934

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 commu-

nication. BCM compares both signals to detect the vehicle speed.

Door Switch

INFOID:0000000009175935

Door switch detects door open/close condition and then transmits ON/OFF signal to BCM.

Outside Key Antenna

INFOID:0000000009175936

Outside key antennas detects whether Intelligent Key is inside the vehicle and transmits the signal to BCM.

Three outside key antennas are installed outside key antenna RH, outside key antenna LH and outside key

antenna rear bumper.

Hood Switch

INFOID:0000000009175937

Hood switch detects that hood is open/closed, and then transmits the signal to IPDM E/R. IPDM E/R transmits

hood switch signal to BCM via CAN communication.

Inside Key Antenna

INFOID:0000000009175938

Inside key antenna detects whether Intelligent Key is inside the vehicle and transmits the signal to BCM.

Three inside key antennas are installed in the instrument center, console and luggage room.

Remote Keyless Entry Receiver

INFOID:0000000009175939

Remote keyless entry receiver receives each button operation signal and electronic key ID signal from Intelli-

gent Key and then transmits the signal to BCM.

Intelligent Key

INFOID:0000000009175940

Each Intelligent Key has an individual electronic ID and transmits the ID signal by request from BCM.

Carrying the Intelligent Key whose ID is registered in BCM, the driver can perform, remote start, door lock/

unlock operation, remote liftgate, panic alarm and push-button ignition switch operation.

SEC-8

< SYSTEM DESCRIPTION >

[WITH INTELLIGENT KEY SYSTEM]

COMPONENT PARTS

Push-button Ignition Switch

INFOID:0000000009175941

Push-button ignition switch detects that push-button is pressed and then transmits the signal to BCM. BCM

changes the power supply position with the operation of push-button ignition switch. BCM maintains the power

supply position status while push-button is not operated.

Security Indicator Lamp

INFOID:0000000009175942

Security indicator lamp is located on combination meter.

Security indicator lamp blinks when power supply position is any position other than ON to warn that NISSAN

VEHICLE IMMOBILIZER SYSTEM-NATS [NVIS (NATS)] is on board.

Starter Control Relay

INFOID:0000000009175943

Engine starting system functions by controlling both starter relay and starter control relay.

Both relays are integrated in IPDM E/R. Starter relay is controlled by BCM and starter control relay is con-

trolled by IPDM E/R on request from BCM.

IPDM E/R transmits starter relay and starter control relay status signal to BCM via CAN communication.

Starter Relay

INFOID:0000000009175944

Engine starting system functions by controlling both starter relay and starter control relay.

Both relays are integrated in IPDM E/R. Starter relay is controlled by BCM, and starter control relay is con-

trolled by IPDM E/R on request from BCM.

IPDM E/R transmits starter relay and starter control relay status signal to BCM via CAN communication.

Stop Lamp Switch

INFOID:0000000009175945

Stop lamp switch detects that brake pedal is depressed, and then transmits the signal to BCM.

Transmission Range Switch

INFOID:0000000009175946

Transmission range switch is integrated in CVT assembly, and detects the CVT shift selector position.

TCM receives the transmission range switch signal and then transmits the P/N position signal to BCM and

IPDM E/R.

BCM confirms the CVT shift selector position with the following 5 signals:

• P (Park) position signal from CVT shift selector (park position switch)

• P/N position signal from TCM

• P (Park) position signal from IPDM E/R (CAN)

• P/N position signal from IPDM E/R (CAN)

• P/N position signal from TCM (CAN)

IPDM E/R confirms the CVT shift selector position with the following 3 signals:

• P (Park) position signal from CVT shift selector (park position switch)

• P/N position signal from TCM

• P/N position signal from BCM (CAN)

Vehicle Information Display

INFOID:0000000009175947

Vehicle information display is integrated in combination meter.

Various information and warnings regarding the Intelligent Key System are displayed.

SYSTEM

SEC-9

< SYSTEM DESCRIPTION >

[WITH INTELLIGENT KEY SYSTEM]

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SYSTEM

INTELLIGENT KEY SYSTEM/ENGINE START FUNCTION
INTELLIGENT KEY SYSTEM/ENGINE START FUNCTION : System Diagram

INFOID:0000000009175948

INTELLIGENT KEY SYSTEM/ENGINE START FUNCTION : System Description

INFOID:0000000009175949

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 NVIS (NATS) ID]. It can perform the door lock/unlock opera-

tion 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 NVIS (NATS) ID ver-

ification 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 cus-

tomer.

ALKIA2853GB

SEC-10

< SYSTEM DESCRIPTION >

[WITH INTELLIGENT KEY SYSTEM]

SYSTEM

NOTE:

Refer to 

DLK-22, "INTELLIGENT KEY SYSTEM : System Description"

 for any functions other than engine

start function of Intelligent Key system.

PRECAUTIONS FOR INTELLIGENT KEY SYSTEM

The transponder [the chip for NVIS (NATS) ID verification] is integrated into the Intelligent Key. 

In that case, the NVIS (NATS) ID verification can be performed when Intelligent Key backside is con-

tacted 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 regis-

tered 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. BCM detects that 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 combina-

tion 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 motor 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 IG-
NITION SWITCH

When Intelligent Key battery is discharged, the NVIS (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 OPERA-
TION

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

NOTE:

• When an Intelligent Key is within the detection area of inside key antenna and 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 operating condition

- Selector lever position

- Vehicle speed

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