Infiniti FX35, FX50 (S51). Manual - part 474

INTELLIGENT KEY SYSTEM

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< SYSTEM DESCRIPTION >

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INTELLIGENT KEY SYSTEM : Component Description

INFOID:0000000005239489

DOOR LOCK FUNCTION

DOOR LOCK FUNCTION : System Diagram

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DOOR LOCK FUNCTION : System Description

INFOID:0000000005239491

Only when pressing the request switch, is it possible to lock and unlock the door by carrying the Intelligent
Key.

OPERATION DESCRIPTION

• When the BCM detects that each door request switch is pressed, it activates the outside key antenna and

inside key antenna corresponding to the pressed door request switch and transmits the request signal to the
Intelligent Key. And then, checks that the Intelligent Key is near the door.

• If the Intelligent Key is within the outside key antenna detection area, it receives the request signal and

transmits the key ID signal to the BCM via remote keyless entry receiver.

• BCM receives the key ID signal and compares it with the registered key ID.

10. Back door lock assembly D122

11.

Back door opener request switch 
D116

A.

View with luggage floor finisher front 
removed

B.

View with back door finisher inner re-
moved

Item

Function

BCM

Controls the Intelligent Key system.

Door lock actuator

Output lock/unlock signal from BCM and locks/unlocks each door.

Door switch

Input door open/close condition to BCM.

Remote keyless entry receiver

Receives lock/unlock signal from the Intelligent Key, and then transmits to BCM.

Request switch

Input lock/unlock operation to BCM.

Intelligent Key

Transmits button operation to remote keyless entry receiver.

Outside key antenna

Detects if Intelligent Key is outside the vehicle.

Inside key antenna

Detects if Intelligent Key is inside the vehicle. 

Unified meter and A/C amp.

• Receive buzzer signal from BCM via CAN communication line, and sounds the buzzer.
• Transmits vehicle speed signal to BCM via CAN communication line.

Combination meter

Display, buzzer (combination meter) and KEY warning lamp are installed to combination meter. 

Intelligent Key warning buzzer

Warns the user of the lock/unlock condition and inappropriate operations with the buzzer sound.

JMKIA2274GB

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< SYSTEM DESCRIPTION >

INTELLIGENT KEY SYSTEM

• BCM lock/unlock each door (except back door) and fuel lid lock actuator and sounds Intelligent Key buzzer

warning (lock: 2 times, unlock: 1 time) at the same time as a reminder.

OPERATION CONDITION

If the following conditions are satisfied, door lock/unlock operation is performed if the request switch is oper-
ated.

*: Even with a registered Intelligent Key remaining inside the vehicle, door locks can be unlocked from outside of the vehicle with a spare
Intelligent Key as long as key IDs are different.

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
driver and passenger door handles (1) and the back door request
switch (2). However, this operating range depends on the ambient
conditions.

SELECTIVE UNLOCK FUNCTION

When a LOCK signal is sent from door request switch (driver side or passenger side), all doors and fuel lid are
locked.
When an UNLOCK signal is sent from door request switch (driver side or passenger side) once, driver's door
and fuel lid are unlocked.
Then, if an UNLOCK signal is sent from door request switch (driver side and passenger side) again within 60
seconds, all other doors are unlocked.

HAZARD AND BUZZER REMINDER FUNCTION

During lock and unlock operation by each request switch, the hazard warning lamps and Intelligent Key warn-
ing buzzer blink or honk as a reminder.
When doors are locked or unlocked by each request switch, BCM sounds Intelligent Key warning buzzer as a
reminder and blinks.

Operating Function of Hazard and Buzzer Reminder

How to Change Hazard and Buzzer Reminder Mode

Refer to 

SEC-25, "INTELLIGENT KEY : CONSULT-III Function (BCM - INTELLIGENT KEY)"

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AUTO DOOR LOCK FUNCTION

When all doors are locked, ignition switch is in the OFF position, and key switch is OFF (Intelligent Key is not
inserted in key slot), doors are unlocked with door request switch
When BCM does not receive the following signals within 60 seconds, all doors and fuel lid are locked.
• Door switch is ON (door is opened)
• Door is locked
• Ignition switch is ON (ignition switch is pressed)
• Key switch is ON (Intelligent Key is inserted in key slot)

Each request switch operation

Operation condition

Lock operation

• All doors are closed
• Ignition switch is in the OFF position
• Intelligent Key is out of key slot
• Intelligent Key is outside the vehicle
• Intelligent Key is within outside key antenna detection area

Unlock Operation

• Intelligent Key is outside the vehicle
• Intelligent Key is within outside key antenna detection area *

JMKIA1954ZZ

Operation

Hazard warning lamp blinks

Intelligent Key warning buzzer sounds

Unlock

Once

Once

Lock

Twice

Twice

INTELLIGENT KEY SYSTEM

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Auto door lock mode can be changed in “AUTO LOCK SET” mode in “WORK SUPPORT”. Refer to 

SEC-25,

"INTELLIGENT KEY : CONSULT-III Function (BCM - INTELLIGENT KEY)"

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INTERIOR ROOM LAMP CONTROL

Intelligent Key system turns on interior lamp by receiving UNLOCK signal from door request switch. For
detailed description, refer to 

INL-6, "System Description"

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LIST OF OPERATION RELATED PARTS

Parts marked with 

×

 are the parts related to operation.

Door lock function

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Door lock/unlock function by request switch

×

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Hazard and buzzer reminder function for door lock/
unlock operation

×

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Key reminder function

×

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Selective unlock function by request switch
(Driver side)

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Selective unlock function by request switch
(Passenger side)

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Selective unlock function by request switch (back 
door)

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Auto door lock function

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< SYSTEM DESCRIPTION >

INTELLIGENT KEY SYSTEM

DOOR LOCK FUNCTION : Component Parts Location

INFOID:0000000005239492

1.

BCM M118, M119, M120, M121, 
M122, M123

2.

Combination meter M53

3.

Key slot M22

4.

IPDM E/R E5, E6

5.

Remote keyless entry receiver M104 6.

A/T shift selector (detention switch) 
M137

JMKIA2606ZZ