Infiniti QX56 (JA60). Manual - part 748

PWC-4

< BASIC INSPECTION >

DIAGNOSIS AND REPAIR WORKFLOW

BASIC INSPECTION

DIAGNOSIS AND REPAIR WORKFLOW

Work Flow

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DETAILED FLOW

1.

 OBTAIN INFORMATION ABOUT SYMPTOM

Interview the customer to obtain the malfunction information (conditions and environment when the malfunc-

tion occurred) as much as possible when the customer brings the vehicle in.

>> GO TO 2

2.

 REPRODUCE THE MALFUNCTION INFORMATION

Check the malfunction on the vehicle that the customer describes.

Inspect the relation of the symptoms and the condition when the symptoms occur.

>> GO TO 3

3.

 IDENTIFY THE MALFUNCTIONING SYSTEM WITH “SYMPTOM DIAGNOSIS”

Use “Symptom diagnosis” from the symptom inspection result in step 2 and then identify where to start per-

forming the diagnosis based on possible causes and symptoms.

>> GO TO 4

4.

 IDENTIFY THE MALFUNCTIONING PARTS WITH “COMPONENT DIAGNOSIS”

Perform the diagnosis with “Component diagnosis” of the applicable system.

>> GO TO 5

5.

 REPAIR OR REPLACE THE MALFUNCTIONING PARTS

Repair or replace the specified malfunctioning parts.

>> GO TO 6

6.

 FINAL CHECK

Check that malfunctions are not reproduced when obtaining the malfunction information from the customer,

referring to the symptom inspection result in step 2.
Are the malfunctions corrected?

YES

>> Inspection End.

NO

>> Refer to 

GI-38, "Intermittent Incident"

.

POWER WINDOW SYSTEM

PWC-5

< FUNCTION DIAGNOSIS >

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FUNCTION DIAGNOSIS

POWER WINDOW SYSTEM

System Diagram

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POWER WINDOW ANTI-PINCH SYSTEM

System Description

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POWER WINDOW MAIN SWITCH

INPUT/OUTPUT SIGNAL CHART

POWER WINDOW AND DOOR LOCK/UNLOCK SWITCH 

INPUT/OUTPUT SIGNAL CHART

ALKIA1301GB

Item

Input signal to main power window and 

door lock/unlock switch

Main power window and door 

lock/unlock switch function

Actuator

Key cylinder switch

LOCK/UNLOCK signal (more than 1.5 
seconds over)

Power window control

Front power window motor

Encoder

Encoder pulse signal

Main power window 
and door lock/unlock 
switch

Front power window motor LH UP/
DOWN signal

Power window and 
door lock/unlock 
switch RH 

Front power window motor RH UP/
DOWN signal

BCM

RAP signal

Rear power window 
control unit

Rear power window motor UP/DOWN 
signal

Rear power window motor

PWC-6

< FUNCTION DIAGNOSIS >

POWER WINDOW SYSTEM

REAR POWER WINDOW CONTROL 

INPUT/OUTPUT SIGNAL CHART

POWER WINDOW OPERATION

• Power window system is operable during the retained power operation timer after turning ignition switch ON

and OFF.

• Main power window and door lock/unlock switch can open/close all windows.

• Power window and door lock unlock switch RH & rear power window switches LH and RH can open/close

the corresponding windows.

REAR POWER VENT WINDOW OPERATION

• Rear power vent window system is operable during the retained power operation timer after turning ignition

switch ON and OFF.

• Rear power vent window switch can open/close the rear power vent window LH and RH.

POWER WINDOW AUTO-OPERATION

• AUTO UP/DOWN operation can be performed when main power window and door lock/unlock switch or

power window and door lock/unlock switch RH turns to AUTO.

• Main power window and door lock/unlock switch controls rear power window LH/RH auto-operation.

• Encoder continues detecting the movement of power window motor and transmits to front power window

switch LH/RH or rear power window control unit LH/RH as the encoder pulse signal while power window

motor is operating.

• Front power window switch LH/RH or rear power window control unit LH/RH reads the changes of encoder

signal and stops AUTO operation when door glass is at fully opened/closed position.

• Power window motor is operable in case encoder is malfunctioning.

RETAINED POWER OPERATION 

• Retained power operation is an additional power supply function that enables power window system to oper-

ate during the 45 seconds even when ignition switch is turned OFF

Retained power function cancel conditions 

• Front door CLOSE (door switch OFF)

→OPEN (door switch ON).

• When ignition switch is ON.

• When timer time passes. (45 seconds)

POWER WINDOW LOCK

The power window lock is designed to lock operation of all windows except for front door window LH.

When in the lock position, the power window lock signal is transmitted to power window and door lock/unlock

switch RH and rear power window control unit LH/RH by power window serial link. This prevents the power

window motor from operating.

Item 

Input signal to front power window 

switch

Front power window switch 

function

Actuator

Power window and 
door lock/unlock 
switch RH

Front power window motor RH UP/
DOWN signal

Power window control

Front power window motor RH

Encoder

Encoder pulse signal

BCM

RAP signal

Item 

Input signal to front power window 

switch

Front power window switch 

function

Actuator

Main power window 
and door lock/un-
lock switch

Rear power window motor LH/RH UP/
DOWN signal

Power window control

Rear power window motor LH/RH

Rear power window 
switch LH/RH

Rear power window motor LH/RH UP/
DOWN signal

Rear power window 
control unit LH/RH

Rear power window motor control LH 
RH UP/DOWN signal

Encoder

Encoder pulse signal

BCM

Power window serial link signal

POWER WINDOW SYSTEM

PWC-7

< FUNCTION DIAGNOSIS >

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ANTI-PINCH OPERATION 

• Pinch foreign material in the door glass during AUTO-UP operation, and it is the anti-pinch function that low-

ers the door glass 150 mm (5.91 in) or 2 seconds when detected.

• Encoder continues detecting the movement of power window motor and transmits to power window switch

as the encoder pulse signal while power window motor is operating.

• Resistance is applied to the power window motor rotation that changes the frequency of encoder pulse sig-

nal if foreign material is trapped in the door glass.

• Front power window switch LH/RH and rear power window control unit LH/RH controls to lower the window

glass for 150 mm (5.91 in) or 2 seconds after it detects encoder pulse signal frequency change.

OPERATION CONDITION

• When all door glass AUTO-UP operation is performed (anti-pinch function does not operate just before the

door glass closes and is fully closed)

NOTE:

Depending on environment and driving conditions, if a similar impact or load is applied to the door glass, it

may lower.

KEY CYLINDER SWITCH OPERATION

Hold the door key cylinder to the LOCK or UNLOCK direction for more than 1 second to OPEN or CLOSE front

power windows when ignition switch is OFF. In addition, it stops when key position is moved to NEUTRAL

when operating.

OPERATION CONDITION 

• Ignition switch OFF

• Hold door key cylinder to LOCK position for more than 1 second to perform CLOSE operation of the door

glass.

• Hold door key cylinder to UNLOCK position for more than 1 second to perform OPEN operation of the door

glass.

KEYLESS POWER WINDOW DOWN OPERATION

Front power windows open when the unlock button on Intelligent Key is activated and kept pressed for more
than 3

(NOTE)

 seconds with the ignition switch OFF. The windows keep opening if the unlock button is continu-

ously pressed.

The power window opening stops when the following operations are performed:

• When the unlock button is kept pressed more than 15 seconds.

• When the ignition switch is turned ON while the power window opening is operated.

• When the unlock button is released.

While retained power operation is activated, keyless power window down function cannot be operated.

NOTE:

Keyless power window down operation mode can be changed by “PW DOWN SET” mode in “WORK SUP-

PORT”. Refer to 

DLK-56, "CONSULT-III Function (INTELLIGENT KEY)"

.

NOTE:

Use CONSULT-III to change settings.

MODE1 (3sec)/MODE2 (OFF)/MODE3 (5sec)