Infiniti QX56 (Z62). Manual - part 387

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< SYSTEM DESCRIPTION >

COMPONENT PARTS

AUTOMATIC BACK DOOR SYSTEM : Component Parts Location

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1.

Combination meter

2.

BCM
Refer to 

BCS-4, "BODY CONTROL 

SYSTEM : Component Parts Loca-
tion"

3.

ABS actuator and electric unit
Refer to 

BRC-10, "Component Parts 

Location"

4.

Automatic back door switch

5.

Automatic back door main switch

6.

Automatic back door control module

JMKIA5223ZZ

COMPONENT PARTS

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AUTOMATIC BACK DOOR SYSTEM : Component Description

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7.

Touch sensor LH

8.

Back door request switch

9.

Back door lock assembly

10. Back door opener switch

11.

Automatic back door close switch

12. Automatic back door warning buzzer

13. Touch sensor RH

A.

View with luggage side finisher up-
per removed

B.

View with back door finisher inner re-
moved

Item

Function

Automatic back door control mod-
ule

Automatic back door control unit, encoder, automatic back door motor and clutch are in-
stalled
• Automatic back door control unit: Controls the automatic back door system 
• Encoder: Automatic back door control unit receives the pulse signals from encoders A 

and B that occurred due to synchronization with the back door operation. The automatic 
back door control unit calculates the back door position, operation direction, and opera-
tion speed according to the received pulse signals.

• Automatic back door motor: Inputs open/close signal from automatic back door control 

unit and activates the automatic back door open/close operation.

• Clutch: Performs the duty control of the power supply to control the operation speed of 

the back door.

BCM

Transmits and receives signals to the automatic back door control module

ABS actuator and electric unit

Transmits vehicle speed signal to CAN communication line

Combination meter

Transmits vehicle speed signal to CAN communication line

Automatic back door warning buzz-
er

Warns the user of the automatic back door condition and inappropriate operations with the 
buzzer sounds

Touch sensor LH/RH

During back door close operation, the touch sensor detects any trapped foreign material

Back door opener switch

Detects if back door opener switch is press/release

Back door request switch

Detects if back door request switch is press/release

Automatic back door switch

Detects if automatic back door switch is press/release

Automatic back door main switch

Detects if automatic back door main switch is press/release

Automatic back door close switch

Detects if automatic back door close switch is press/release

Back door lock assembly

Back door closure motor, half latch switch, open switch, close switch and back door switch 
are installed
• Closure motor: Inputs open/close signal from automatic back door control unit and acti-

vates the back door auto closure operation

• Half latch switch: Starts the closure motor close operation
• Open switch: Stops the closure motor open operation
• Close switch: Stops the closure motor close operation
• Back door switch: Inputs back door open/ close condition to BCM

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< SYSTEM DESCRIPTION >

SYSTEM (POWER DOOR LOCK SYSTEM)

SYSTEM (POWER DOOR LOCK SYSTEM)

System Diagram

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System Description

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DOOR LOCK FUNCTION

Door Lock and Unlock Switch

• The door lock and unlock switch (driver side) is build into power window main switch.
• The door lock and unlock switch (passenger side) is build into front power window switch (passenger side).
• Interlocked with the locking operation of door lock and unlock switch, door lock actuators of all doors and

fuel lid lock actuator are locked.

• Interlocked with the unlocking operation of door lock and unlock switch, door lock actuators of all doors actu-

ator and fuel lid lock actuator are unlocked.

Door Key Cylinder Switch

• With the mechanical key inserted in the door key cylinder on driver side, turning it to lock position, locks door

lock actuator of all doors and fuel lid lock actuator.

• With the mechanical key inserted in the door key cylinder on driver side, turning it to unlock position once

unlocks the driver side door, turning it to unlock position again within 60 seconds after the first unlock opera-
tion unlocks all of the other doors actuator and fuel lid lock actuator. (SELECTIVE UNLOCK OPERATION)

Selective unlock operation mode can be changed using CONSULT-III.
Refer to 

DLK-39, "DOOR LOCK : CONSULT-III Function (BCM - DOOR LOCK)"

.

DOOR KEY CYLINDER SWITCH POWER WINDOW FUNCTION

Driver side door key cylinder LOCK/UNLOCK operation can activate power window. Refer to 

PWC-8, "System

Description"

.

IGNITION POSITION WARNING FUNCTION

When door lock and unlock switch are operated while driver side door is open and ignition position is ACC or
ON, door locks once but immediately unlocks.

INTERIOR ROOM LAMP CONTROL FUNCTION

Interior room lamp is controlled according to door lock/unlock state, refer to 

INL-6, "INTERIOR ROOM LAMP

CONTROL SYSTEM : System Description"

.

AUTOMATIC DOOR LOCK/UNLOCK FUNCTION (LOCK OPERATION)

The interlock door lock function is the function that locks all doors linked with the vehicle speed or shift posi-
tion. It has 2 types as per the following items. 

Vehicle Speed Sensing Auto Door Lock

All doors are locked when the vehicle speed reaches 24 km/h (15 MPH) or more. 
BCM outputs the lock signal to all door lock actuators when it detects that the ignition switch is turned ON, all
doors are closed and the vehicle speed received from the combination meter via CAN communication
becomes 24 km/h (15 MPH) or more. 

JMKIA5278GB

SYSTEM (POWER DOOR LOCK SYSTEM)

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P Range Interlock Door Lock

All doors are locked when shifting the selector lever from the P position to any position other than P. 
BCM outputs the lock signal to all door lock actuators when it detects that the ignition switch is in the ON posi-
tion, all doors are closed and the shift signal received from the TCM via CAN communication shifted from the
P position to any position other than P. 

Setting change of Automatic Door Lock/Unlock Function

The lock operation setting of the automatic door lock/unlock function can be changed. 

 With CONSULT-III

The ON/OFF switching of the automatic door lock function and the type selection of the automatic door lock/
unlock function can be performed at the WORK SUPPORT setting of CONSULT-III. 

 Without CONSULT- III 

The automatic door lock function ON/OFF can be switched by performing the following operation. 

1.

Close all doors (door switch OFF)

2.

Ignition switch: OFF

→

ON 

3.

Press and hold the door lock and unlock switch for 5 seconds or more in the lock direction within 20 sec-
onds after turning the ignition switch ON. 

4.

The switching complete when the hazard lamp blinks. 

AUTOMATIC DOOR LOCK/UNLOCK FUNCTION (UNLOCK OPERATION)

The automatic door lock/unlock function is the function that unlocks all doors linked with the key position or
shift position. It has 2 types as per the following items. 

IGN OFF Interlock Door Unlock

All doors are unlocked when the power supply position is changed from ON to OFF. 
BCM outputs the unlock signal to all door lock actuators when it detects that the power supply position is
changed from ignition switch ON to OFF. 

P Range Interlock Door Unlock

All doors are unlocked when shifting the selector lever from any position other than the P to P position. 
BCM outputs the unlock signal to all door lock actuators when it detects that the ignition switch is in the ON
position and the shift signal received from TCM via CAN communication is shifted from any position other than
the P to P position. 

Setting change of Automatic Door Lock/Unlock Function

The unlock operation setting of the automatic door lock/unlock function can be changed. 

 With CONSULT- III

The ON/OFF switching of the automatic door lock/unlock function and the type selection of the automatic door
lock/unlock function can be performed at the WORK SUPPORT setting of CONSULT-III. 

 Without CONSULT- III

The automatic door lock/unlock function ON/OFF can be switched by performing the following operation. 

1.

Close all doors (door switch OFF)

2.

Ignition switch: OFF

→

ON 

3.

Press and hold the door lock and unlock switch for 5 seconds or more in the unlock direction within 20
seconds after turning the power supply position ON. 

4.

The switching is complete when the hazard lamp blinks. 

OFF 

→

 ON

: 2 blinks

ON 

→

 OFF

: 1 blink

OFF 

→

 ON

: 2 blinks

ON 

→

 OFF

: 1 blink