2011 INFINITI QX56 stop start

DLK-32
< SYSTEM DESCRIPTION >
SYSTEM (AUTOMATIC BACK DOOR SYSTEM)
Open Function
When back door opener switch is pressed and automatic back door main switch in the OFF position, BCM
transmits the back door open request signal to automatic back door control unit via CAN communication, and
automatic back door control unit opens back door lock assembly.
Closure Function
When the back door is closed to the half-latch position, the motor drives to rotate the latch lever and pulls it in
from half latched to fully latched and automatically clos es the door. Then, reverse the closure motor to the
neutral position.
WARNING FUNCTION
The warning function is as follows and gives the user warning information and warnings using automatic back
door buzzer and hazard.
Buzzer Operation Condition
ANTI-PINCH FUNCTION
During auto operation, if an object is detected by encoder pulse in the door's path, a warning chime sounds
and the back door operates in the reverse direction to prevent pinching.
During auto close operation, if an object is detected by the touch sensors in the door's path, a warning chime
sounds and the back door operates in the open direction until it is fully open.
Operation Condition
Pattern Time Description
A 0.75 sec. Operation start announcement
Anti-pinch operation start announcement
B Pi--- 2.0 sec. During the closure operation, the touch
sensor detects any trapped foreign materi-
al and stops halfway
C Pi------ Back door fully closed or vehi-
cle is stoppedThe conditions are not satisfied in the fully
open position or during the operation, and
then the operation continues
D During open/close operation During operation announcement
JMKIA1862ZZ
JMKIA1863ZZ
Detection method Encoder pulse Touch sensor
Applicable operation Open/close operation Close operation
Operation when
any trapped for-
eign material is de-
tected Stop the vehicle
Buzzer sounds (pattern A)
and reverse operation  Buzzer sounds (pattern A) and the back door stops in
the fully-open position after reverse operation
 During closure (close) operation (at main switch OFF): Closure [open (neutral position return)] operation
Running the ve-
hicle No reverse operation (buzzer
sounds, pattern C)  The back door reverses a certain amount, and then it
reverses automatically to perform the auto close oper-
ation
 During closure (close) operation (at main switch ON):
Closure (open) operation
Revision: 2010 May2011 QX56

SYSTEM (AUTOMATIC BACK DOOR SYSTEM)
DLK-33
< SYSTEM DESCRIPTION >
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INTERMITTENT CLUTCH FUNCTION
If the main switch is turned to OFF during auto operation, the back door may be closed suddenly because the
operation is interrupted immediately when the operati on cannot be continued because of the detection of a
system malfunction. Therefore, operat e the clutch intermittently to stabilize the back door behavior and ensure
safety.
AUTOMATIC BACK DOOR OPEN/CLOSE OPERATION CONDITION
*: If the registered Intelligent Key is used, the operation can be performed even if the back door is in the LOCK position
CONTROL IF NOT WITHIN THE OPERAT ION CONDITIONS DURING THE OPERATION
If the back door is not within the operation conditions dur ing the operation, the automatic back door control unit
performs the control as follows.
Non-reverse area  Just after starting the mo-
tor operation
 Full range of closure oper- ation
Driving  Back door open operation
 Closure [open (return the latch to the neutral position)]
Switch operation during reverse op-
eration Receive
Number of allowable reverse opera-
tions Perform the intermittent clutch function after 2 reverse operations regardless of the oper-
ation direction
Detection method Encoder pulse Touch sensor
Automatic back door switch Intelligent Key
Automat-
ic back
door close switch Back door opener
switch
Operating direction Fully closed → Open Fully open
→ Closed Fully
closed →
Open Fully open
→ Closed Fully open
→ Closed Fully closed
→ Open
Main switch — — — — ON ON
Ignition position ON ACC/
LOCK ———ON
ACC/
LOCK
Shift selector lever P position — — — — — P position —
Vehicle speed 0 km/h
Back door lock condition — — — — — Unlock*
Touch sensor Normal
Power supply
(Automatic power back
door control unit) Approx. 11 V or more
Item
(Condition) Back door condition
Main Switch (ON → OFF) Motor: OFF
 Clutch: OFF (Intermittent clutch function)
Vehicle stop condition (open operation)
 IGN ON and shift P position →IGN ON and
other than P position
 IGN OFF and shift N position → IGN ON and
N position The operation is continued
Operation condition release during the opera-
tion start announcement condition Automatic back door function does not operate
Revision: 2010 May2011 QX56

SQUEAK AND RATTLE TROUBLE DIAGNOSESDLK-211
< SYMPTOM DIAGNOSIS >
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Insulates where slight movement is present. Ideal for instrument panel applications.
SILICONE GREASE
Used in place of UHMW tape that is be visible or does not fit. Will only last a few months.
SILICONE SPRAY
Used when grease cannot be applied.
DUCT TAPE
Used to eliminate movement.
CONFIRM THE REPAIR
Confirm that the cause of a noise is repaired by test driving the vehicle. Operate the vehicle under the same
conditions as when the noise originally occurred. Refer to the notes on the Diagnostic Worksheet.
Inspection ProcedureINFOID:0000000006226060
Refer to Table of Contents for specific component removal and installation information.
INSTRUMENT PANEL
Most incidents are caused by contact and movement between:
1. Cluster lid A and instrument panel
2. Acrylic lens and combination meter housing
3. Instrument panel to front pillar garnish
4. Instrument panel to windshield
5. Instrument panel mounting pins
6. Wiring harnesses behind the combination meter
7. A/C defroster duct and duct joint
These incidents can usually be located by tapping or moving the components to duplicate the noise or by
pressing on the components while driving to stop the noi se. Most of these incidents can be repaired by apply-
ing felt cloth tape or silicon spray (in hard to reach areas). Urethane pads can be used to insulate wiring har-
ness.
CAUTION:
Do not use silicone spray to isolate a squeak or ra ttle. If you saturate the area with silicone, you will
not be able to recheck the repair.
CENTER CONSOLE
Components to pay attention to include:
1. Shifter assembly cover to finisher
2. A/C control unit and cluster lid C
3. Wiring harnesses behind audio and A/C control unit
The instrument panel repair and isolation pr ocedures also apply to the center console.
DOORS
Pay attention to the:
1. Finisher and inner panel making a slapping noise
2. Inside handle escutcheon to door finisher
3. Wiring harnesses tapping
4. Door striker out of alignment causing a popping noise on starts and stops
Tapping or moving the components or pressing on them while driving to duplicate the conditions can isolate
many of these incidents. You can usually insulate the areas with felt cloth tape or insulator foam blocks to
repair the noise.
TRUNK
Trunk noises are often caused by a loose jack or loose items put into the trunk by the owner.
In addition look for:
1. Trunk lid dumpers out of adjustment
2. Trunk lid striker out of adjustment
3. Trunk lid torsion bars knocking together
4. A loose license plate or bracket
Revision: 2010 May2011 QX56

DLN-14
< SYSTEM DESCRIPTION >[TRANSFER: ATX90A]
STRUCTURE AND OPERATION
DESCRIPTION
 Ball ramp lever operates in the direction of main shaft axis according to rotation of actuator shaft and
presses piston. Pressure is applied to each clutch and torque is transmitted.
 Shift fork operates in the direction of main shaft axis according to rotation of actuator shaft and performs
engagement and disengagement to Hi-Lo sleeve and lock sleev e of main shaft. Mode is switched between
4H ⇔4L.
AUTO MODE
 The optimum torque distribution is electronically performed for front and rear wheels according to road con-
ditions.
 Stable start without wheel spin is possible on slippery road conditions, such as on a snowy road.
 When road condition does not require 4WD driving, the st atus becomes close to rear wheel drive, which
results in better fuel efficiency and prov ides FR-like steering characteristics.
 The vehicle cornering status is judged according to information from each sensor, and the optimum torque is
distributed to front wheels for prev enting tight-corner braking symptom.
NOTE:
When there is a difference of revolution speed between the front and rear wheel the shift occasionally changes
to direct 4-wheel driving conditions aut omatically. This is not a malfunction.
4H MODE
 Torque distribution for front and rear wheels is fixed and stable start is achieved while driving on an rough,
sandy or snowy road.
4L MODE
 Large traction force is obtained due to low gear. High running ability and escaping ability are achieved.
 Switching from 4H mode to 4L mode is not possible w hen the vehicle is not stopped and A/T shift selector is
not in the neutral position.
TORQUE DISTRIBUTION DIAGRAM
JPDIE0256GB
Revision: 2010 May2011 QX56

ADDITIONAL SERVICE WHEN REPLACING TRANSFER CONTROL UNIT
DLN-41
< BASIC INSPECTION > [TRANSFER: ATX90A]
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ADDITIONAL SERVICE WHEN RE PLACING TRANSFER CONTROL UNIT
DescriptionINFOID:0000000006222234
Perform writing unit parameter and initial calibration after replacing transfer control unit. Refer to DLN-41,
"Work Procedure".
Work ProcedureINFOID:0000000006222235
NOTE:
In fail-safe mode, can not perform work support. (Except that DTC P181F is detected.)
1.WRITE UNIT PARAMETER
Perform writing unit parameter to control unit. Refer to DLN-48, "
Work Procedure".
>> GO TO 2.
2.INITIAL CALIBRATION (1)
With CONSULT-III
1. Start the engine. CAUTION:
Never drive the vehicle.
2. Check “4WD MODE”, “T/M RANGE”, “COMER VHCL SPEED”, “MOTOR POWER SUP” of CONSULT-III
“DATA MONITOR” for “ALL MODE AWD/4WD”.
3. Continue the following condition more than 10 seconds.
Does the transfer motor operate automatically?
YES >> After the transfer motor operation st op (After approximately 10 seconds) GO TO 4.
NO >> GO TO 3.
3.INITIAL CALIBRATION (2)
With CONSULT-III
1. Select “START CALIBRATION” of CONSULT- III “WORK SUPPORT” for “ALL MODE AWD/4WD”.
2. Wait until the motor operation stop. (After approximately 10 seconds)
>> GO TO 4.
4.PERFORM SELF-DIAGNOSIS
With CONSULT-III
1. Erase self-diagnosis result for “ALL MODE AWD/4WD”.
2. Turn the ignition switch ON to OFF. CAUTION:
Wait for 10 seconds after turning ignition switch OFF.
3. Start the engine.
CAUTION:
Never drive the vehicle.
4. Perform self-diagnosis for “ALL MODE AWD/4WD”.
Is
“DTC P181F” detected?
YES >> GO TO 1.
NO >> WORK END
4WD MODE : AUTO
T/M RANGE : N
COMPER VHCL SPEED : 0 km/h (Never drive the vehicle)
MOTOR POWER SUP : More than 11 V
Revision: 2010 May2011 QX56

DLN-42
< BASIC INSPECTION >[TRANSFER: ATX90A]
ADDITIONAL SERVICE WHEN
REPLACING TRANSFER ASSEMBLY
ADDITIONAL SERVICE WHEN REPLACING TRANSFER ASSEMBLY
DescriptionINFOID:0000000006222236
Perform writing unit parameter, transfer fluid viscosity learning and initial calibration after replacing transfer
assembly. Refer to DLN-42, "
Work Procedure".
Work ProcedureINFOID:0000000006222237
NOTE:
In fail-safe mode, can not perform work s upport. (Except that DTC P181F is detected.)
1.WRITE UNIT PARAMETER
Perform writing unit parameter to control unit. Refer to DLN-48, "
Work Procedure".
>> GO TO 2.
2.PREPARATION BEFORE WORK
With CONSULT-III
1. Start the engine. CAUTION:
Never drive the vehicle.
2. Check “4WD MODE”, “T/M RANGE”, “COMER V HCL SPEED”, “MOTOR POWER SUP” of CONSULT-III
“DATA MONITOR” for “ALL MODE AWD/4WD”.
3. Continue the following condition more than 10 seconds.
>> GO TO 3.
3.PERFORM TRANSFER FLUID VISCOSITY LEARNING
With CONSULT-III
1. Select “OIL DETERIORATION INFO RESET” of CONSULT-III “WORK SUPPORT” for “ALL MODE AWD/
4WD”.
2. Select “Start”.
>> GO TO 4.
4.INITIAL CALIBRATION
With CONSULT-III
1. Select “START CALIBRATION” of CONSULT- III “WORK SUPPORT” for “ALL MODE AWD/4WD”.
2. Wait until the motor operation stop. (After approximately 10 seconds)
>> GO TO 5.
5.PERFORM SELF-DIAGNOSIS
With CONSULT-III
1. Erase self-diagnosis result for “ALL MODE AWD/4WD”.
2. Turn the ignition switch ON to OFF. CAUTION:
Wait for 10 seconds after turn ing ignition switch OFF.
3. Start the engine. CAUTION:
Never drive the vehicle.
4. Perform self-diagnosis for “ALL MODE AWD/4WD”.
4WD MODE : AUTO
T/M RANGE : N
COMPER VHCL SPEED : 0 km/h (Never drive the vehicle)
MOTOR POWER SUP : More than 11 V
Revision: 2010 May2011 QX56

DLN-44
< BASIC INSPECTION >[TRANSFER: ATX90A]
TRANSFER LOCK POSITION SENSOR LEARNING
TRANSFER LOCK POSI
TION SENSOR LEARNING
DescriptionINFOID:0000000006222238
 Detect a stroke of transfer lock sleeve and learn operating area of transfer lock sleeve (Lock/Unlock)
 Perform the learning of transfer lock position sensor by “CONFIGURATION” of CONSULT-III function. Refer
to DLN-44, "
Work Procedure".
CAUTION:
Before performing the learning of lock position sensor, must erase l earning of transfer lock position
sensor.
*: “LOCK SLEEVE SENSOR” means transfer lock position sensor.
Work ProcedureINFOID:0000000006222239
NOTE:
In fail-safe mode, can not perform work support. (Except that DTC P181F or P182B is detected.)
1.PREPARATION BEFORE WORK
With CONSULT-III
1. Start the engine. CAUTION:
Never drive the vehicle.
2. Check “4WD MODE”, “T/M RANGE”, “COMER V HCL SPEED”, “MOTOR POWER SUP” of CONSULT-III
“DATA MONITOR” for “ALL MODE AWD/4WD”.
3. Continue the following condition.
>> GO TO 2.
2.PERFORM ERASE LOCK POSITION SENOR LEARNING
With CONSULT-III
1. Select “LOCK SLEEVE SENSOR INITIALIZE” of CONSULT-III “WORK SUPPORT” for “ALL MODE AWD/
4WD”.
2. Select “Start”.
3. Wait until the motor operation stop.
>> GO TO 3.
3.PERFORM LOCK POSITION SENOR LEARNING
With CONSULT-III
1. Select “LOCK SLEEVE SENSOR LEARNING” of CONSULT-III “WORK SUPPORT” for “ALL MODE
AWD/4WD”.
2. Select “Start”.
3. Wait until the motor operation stop.
>> GO TO 4.
4.PERFORM SELF-DIAGNOSIS
With CONSULT-III
Function Description
LOCK SLEEVE SENSOR
* INITIALIZE Format learning the transfer lock position sensor written to transfer control unit.
LOCK SLEEVE SENSOR
* LEARNING Perform learning the transfer lock position sensor.
4WD MODE : 4L
T/M RANGE : N
COMPER VHCL SPEED : 0 km/h
(Never drive the vehicle)
MOTOR POWER SUP : More than 11 V
Revision: 2010 May2011 QX56

TRANSFER FLUID VISCOSITY LEARNINGDLN-47
< BASIC INSPECTION > [TRANSFER: ATX90A]
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TRANSFER FLUID VISCOSITY LEARNING
DescriptionINFOID:0000000006222242
Perform transfer fluid viscosity learning and initial calibration after draining and refilling transfer fluid. Refer to
DLN-47, "
Work Procedure".
Work ProcedureINFOID:0000000006222243
NOTE:
In fail-safe mode, can not perform work s upport. (Except that DTC P181F is detected.)
1.PREPARATION BEFORE WORK
With CONSULT-III
1. Start the engine.
CAUTION:
Never drive the vehicle.
2. Check “4WD MODE”, “T/M RANGE”, “COMER VHCL SPEED”, “MOTOR POWER SUP” of CONSULT-III
“DATA MONITOR” for “ALL MODE AWD/4WD”.
3. Continue the following condition more than 10 seconds.
>> GO TO 2.
2.TRANSFER FLUID VISCOSITY LEARNING
With CONSULT-III
1. Select “OIL DETERIORATION INFO RESET” of CONSULT-III “WORK SUPPORT” for “ALL MODE AWD/
4WD”.
2. Select “Start”.
>> GO TO 3.
3.INITIAL CALIBRATION
With CONSULT-III
1. Select “START CALIBRATION” of CONSULT- III “WORK SUPPORT” for “ALL MODE AWD/4WD”.
2. Wait until the motor operation stop. (After approximately 10 seconds)
>> GO TO 4.
4.PERFORM SELF-DIAGNOSIS
With CONSULT-III
1. Erase self-diagnosis result for “ALL MODE AWD/4WD”.
2. Turn the ignition switch ON to OFF.
CAUTION:
Wait for 10 seconds after turning ignition switch OFF.
3. Start the engine.
CAUTION:
Never drive the vehicle.
4. Perform self-diagnosis for “ALL MODE AWD/4WD”.
Is
“DTC P181F” detected?
YES >> GO TO 1.
NO >> WORK END
4WD MODE : AUTO
T/M RANGE : N
COMPER VHCL SPEED : 0 km/h (Never drive the vehicle)
MOTOR POWER SUP : More than 11 V
Revision: 2010 May2011 QX56