2011 INFINITI QX56 BATTERY CONNECTORS

DLK-92
< DTC/CIRCUIT DIAGNOSIS >
B2419 OPEN SWITCH
B2419 OPEN SWITCH
DTC LogicINFOID:0000000006225891
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON.
2. Check “Self Diagnostic Result” mode of “AUTOMAT IC BACK DOOR CONTROL UNIT” using CONSULT-
III.
Is DTC detected?
YES >> Refer to DLK-92, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006225892
1.CHECK OPEN SWITCH SIGNAL
1. Select “AUTOMATIC BACK DOOR CONTROL UNIT” using CONSULT-III.
2. Select “OPEN SW” in “DATA MONITOR” mode.
3. Check that the function operates normall y according to the following conditions.
Is the inspection result normal?
YES >> GO TO 6.
NO >> GO TO 2.
2.CHECK AUTOMATIC BACK DOOR CONTROL MODULE OUTPUT SIGNAL
1. Turn ignition switch OFF.
2. Disconnect back door lock assembly connector.
3. Check voltage between back door lock assembly harness connector and ground.
Is the inspection result normal?
YES >> GO TO 4.
NO >> GO TO 3.
DTC CONSULT-III display
description DTC detecting condition Possible cause
B2419 OPEN SW When the automatic back door control unit detects
any of the following conditions
 The change of open switch cannot be detected
for 1 second or more after starting the closure
open output for the 3rd time in a row
 The change of open switch cannot be detected for 0.5 second or more after starting the closure
close output for the 3rd time in a row
 The condition that the open switch is in the ON position and the close switch is in the OFF posi-
tion is detected when starting the closure open/
close output for the 3rd time in a row  Open switch
 Harness or connectors
(Open switch circuit is open or
shorted)
 Automatic back door control mod- ule
Monitor item Condition Status
OPEN SW Back door Fully closed/Half latch OFF
Open ON
(+)
(–)Voltag e
(Approx.)
Back door lock assembly
Connector Terminal D157 4 Ground Battery voltage
Revision: 2010 May2011 QX56

B2420 CLOSE SWITCHDLK-95
< DTC/CIRCUIT DIAGNOSIS >
C
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DLK
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B2420 CLOSE SWITCH
DTC LogicINFOID:0000000006225894
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON.
2. Check “Self Diagnostic Result” mode of “AUTOMAT IC BACK DOOR CONTROL UNIT” using CONSULT-
III.
Is DTC detected?
YES >> Refer to DLK-95, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006225895
1.CHECK CLOSE SWITCH SIGNAL
1. Select “AUTOMATIC BACK DOOR CONTROL UNIT” using CONSULT-III.
2. Select “CLOSE SW” in “DATA MONITOR” mode.
3. Check that the function operates normall y according to the following conditions.
Is the inspection result normal?
YES >> GO TO 6.
NO >> GO TO 2.
2.CHECK AUTOMATIC BACK DOOR CONTROL MODULE OUTPUT SIGNAL
1. Turn ignition switch OFF.
2. Disconnect back door lock assembly connector.
3. Check voltage between back door lock assembly harness connector and ground.
Is the inspection result normal?
YES >> GO TO 4.
NO >> GO TO 3.
3.CHECK CLOSE SWITCH CIRCUIT
1. Disconnect automatic back door control module connector.
2. Check continuity between automatic back door control module harness connector and back door lock
assembly harness connector.
DTC CONSULT-III display
description DTC detecting condition Possible cause
B2420 CLOSE SW When the automatic back door control unit detects
any of the following conditions
 The change of close switch cannot be detected
for 3 second or more after starting the closure
close output for the 3rd time in a row  Close switch
 Harness or connectors
(Close switch circuit is open or
shorted)
 Automatic back door control mod- ule
Monitor item Condition Status
CLOSE SW Back door Open/Half latch OFF
Fully closed ON
(+)
(–)Voltag e
(Approx.)
Back door lock assembly
Connector Terminal D157 5 Ground Battery voltage
Revision: 2010 May2011 QX56

DLK-252
< REMOVAL AND INSTALLATION >
CAB MOUNTING INSULATOR
 Drain brake fluid from brake line. Refer to BR-10, "Draining".
 Release fuel pressure. Refer to EC-153, "
Work Procedure".
 Disconnect both battery cables. Refer to PG-164, "
Removal and Installation".
 Drain engine coolant from radiator. Refer to CO-8, "
Draining".
 Discharge refrigerant from A/C circuit. Refer to HA-20, "
Recycle Refrigerant".
 Drain power steering fluid from reservoir tank.
4. Remove parts relating to connection of body assembly and frame assembly.  Tire and wheel: Refer to WT-64, "
Removal and Installation" (with TPMS).
 Front fender protector (LH and RH): Refer to EXT-23, "
FENDER PROTECTOR : Removal and Installa-
tion".
 Front bumper: Refer to EXT-13, "
Removal and Installation".
 Radiator core support upper: Refer to DLK-220, "
Removal and Installation".
 Fan shroud: Refer to CO-16, "
Removal and Installation".
 Battery and battery case: Refer to PG-164, "
Removal and Installation".
 Air cleaner case (upper and lower): Refer to EM-27, "
Removal and Installation".
 Engine cover: Refer to EM-25, "
Removal and Installation".
 Rear wheel house protector (LH and RH): EXT-24, "
REAR WHEEL HOUSE PROTECTOR : Removal
and Installation".
 Rear bumper: Refer to EXT-17, "
Removal and Installation".
 Fuel filler tube: Remove to FL-8, "
Exploded View".
 Spare tire
 Towing hook bracket.
5. Separate parts relating to connection of body assembly and frame assembly. Vehicle front
 Disconnect ICC sensor connector. (models with ICC) Refer to CCS-176, "
Removal and Installation".
 Remove radiator upper hose and radiator lower hose from radiator assembly. Refer to CO-13,
"Exploded View".
 Remove A/T fluid cooler hose B and A/T fluid cooler hose E from A/T fluid cooler tubes. Refer to TM-
202, "Exploded View".
 Remove power steering return hose from oil cooler, and then power steering return hose clamp bolt from frame assembly. Refer to ST-54, "
Exploded View".
 Remove power steering suction hose from reservoir tank. Refer to ST-54, "
Exploded View".
CAUTION:
Never spill power steering fluid in engine room.
 Remove A/C low-presser flexible hose from A/C low-presser pipe. Refer to HA-35, "
LOW-PRESSURE
FLEXIBLE HOSE : Removal and Installation".
 Remove A/C hi-presser flexible hose from condenser. Refer to HA-34, "
HIGH-PRESSURE FLEXIBLE
HOSE : Removal and Installation".
 Remove all engine Control Harness connectors, har ness clips and others that are connected to the
body assembly side of the engine room. (engine room LH and RH side). Refer to PG-148, "
Engine Con-
trol Harness".
NOTE:
Separate harness connectors from ECM (engine control module). Refer to EC-10, "
General Precau-
tions".
CAUTION:
 When pulling out harnesses, never damage harnesses or connectors.
 After temporarily securing connectors, cover th em with vinyl or similar material to protect
against adhesion of foreign materials.
 Disconnect engine room harness connectors and remo ve harness clips from engine assembly (engine
RH side). Refer to PG-146, "
Engine Room Harness".
 Remove heater hoses from front water outlet tube (engine room RH side). Refer to HA-33, "
Exploded
View".
 Disconnect front wheel sensor connectors (LH and RH). Refer to BRC-134, "
FRONT WHEEL SENSOR
: Exploded View".
 Disconnect fuel feed tube and EVAP hos e (front wheel well LH side).
 Remove steering lower shaft from steering gear side assembly. Refer to ST-37, "
Removal and Installa-
tion"
CAUTION:
Spiral cable may be cut if steering wheel turns while separating steering column assembly and
steering gear assembly.
Revision: 2010 May2011 QX56

DLN-6
< PRECAUTION >[TRANSFER: ATX90A]
PRECAUTIONS
PRECAUTION
PRECAUTIONS
Precaution for Supplemental Restraint S
ystem (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000006222209
The Supplemental Restraint System such as “A IR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severi ty of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and w hether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the “SRS AIR BAG” and “SEAT BELT” of this
Service Manual.
WARNING:
• To avoid rendering the SRS inopera tive, which could increase the risk of personal injury or death in
the event of a collision that would result in air bag inflation, all maintenance must be performed by
an authorized NISS AN/INFINITI dealer.
 Improper maintenance, including in correct removal and installation of the SRS, can lead to personal
injury caused by unintent ional activation of the system. For re moval of Spiral Cable and Air Bag
Module, see the “SRS AIR BAG”.
 Do not use electrical test equipmen t on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identi fied by yellow and/or orange harnesses or har-
ness connectors.
PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS
WARNING:
 When working near the Air Bag Diagnosis Sensor Unit or other Air Bag System sensors with the ignition ON or engine running, DO NOT use air or electric power tools or strike near the sensor(s)
with a hammer. Heavy vibration could activate the sensor(s) and deploy the air bag(s), possibly
causing serious injury.
 When using air or electric power tools or hammers , always switch the ignition OFF, disconnect the
battery, and wait at least 3 minu tes before performing any service.
Precaution Necessary for Steering W heel Rotation after Battery Disconnect
INFOID:0000000006222210
NOTE:
 Before removing and installing any control units, first tu rn the push-button ignition switch to the LOCK posi-
tion, then disconnect bot h battery cables.
 After finishing work, confirm that all control unit connectors are connected properly, then re-connect both
battery cables.
 Always use CONSULT-III to perform self-diagnosis as a part of each function inspection after finishing work.
If a DTC is detected, perform trouble diagnos is according to self-diagnosis results.
For vehicle with steering lock unit, if the battery is disconnected or discharged, the steering wheel will lock and
cannot be turned.
If turning the steering wheel is required with the bat tery disconnected or discharged, follow the operation pro-
cedure below before starting the repair operation.
OPERATION PROCEDURE
1. Connect both battery cables. NOTE:
Supply power using jumper cables if battery is discharged.
2. Turn the push-button ignition switch to ACC position. (At this time, the steering lock will be released.)
3. Disconnect both battery cables. The steering lock wi ll remain released with both battery cables discon-
nected and the steering wheel can be turned.
4. Perform the necessary repair operation.
Revision: 2010 May2011 QX56

P1811 POWER SUPPLY CIRCUIT FOR TRANSFER CONTROL UNIT
DLN-65
< DTC/CIRCUIT DIAGNOSIS > [TRANSFER: ATX90A]
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DLN
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3.CHECK TRANSFER CONTROL UNIT POWER SUPPLY (3)
1. Turn the ignition switch OFF.
2. Check the voltage between transfer control unit harness connector and ground.
3. Turn the ignition switch ON. CAUTION:
Never start the engine.
4. Check the voltage between transfer control unit harness connector and ground.
Is the inspection result normal?
YES >> GO TO 5.
NO >> GO TO 4.
4.CHECK TRANSFER CONTROL UNIT POWER SUPPLY (4)
1. Turn the ignition switch OFF.
2. Check the 10A fuse (#56).
3. Disconnect IPDM E/R harness connector.
4. Check the continuity between transfer control unit harness connector and IPDM E/R harness connector.
5. Check the continuity between transfer control unit harness connector and the ground.
Is the inspection result normal?
YES >> Perform the trouble diagnosis for ignition power supply circuit. Refer to PG-89, "Wiring Diagram -
IGNITION POWER SUPPLY -".
NO >> Repair or replace error-detected parts.
5.CHECK TRANSFER CONTROL UNIT GROUND
1. Turn the ignition switch OFF.
2. Check the continuity between transfer control unit harness connector and ground.
Is the inspection result normal?
YES >> GO TO 6.
NO >> Repair or replace error-detected parts.
6.CHECK TERMINALS AND HARNESS CONNECTORS
Transfer control unit — Voltage
Connector Terminal
E59 32 Ground 0 V
Transfer control unit — Voltage
Connector Terminal
E59 32 Ground Battery voltage
IPDM E/R Transfer control unit Continuity
Connector Terminal Connector Terminal
E15 58 E59 32 Existed
Transfer control unit —Continuity
Connector Terminal
E59 32 Ground Not existed
Transfer control unit —Continuity
Connector Terminal
E60 46
Ground Existed
44
Revision: 2010 May2011 QX56

DLN-76
< DTC/CIRCUIT DIAGNOSIS >[TRANSFER: ATX90A]
P181C TRANSFER MOTOR POWER SUPPLY
P181C TRANSFER MO
TOR POWER SUPPLY
DescriptionINFOID:0000000006222276
Supplies power to transfer control actuator (transfer motor).
DTC LogicINFOID:0000000006222277
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.DTC REPRODUCTION PROCEDURE
With CONSULT-III
1. Turn the ignition switch OFF to ON.
2. Perform self-diagnosis for “ALL MODE AWD/4WD”.
Is DTC
“P181C” detected?
YES >> Proceed to diagnosis procedure. Refer to DLN-76, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006222278
1.CHECK TRANSFER MOTOR POWER SUPPLY (2)
Check the voltage between transfer control unit harness connector and ground.
Is the inspection result normal?
YES >> GO TO 3.
NO >> GO TO 2.
2.CHECK TRANSFER MOTOR POWER SUPPLY CIRCUIT (2)
1. Turn the ignition switch OFF.
2. Check the 30A fusible link (J).
3. Check the harness for open or short between transfe r control unit harness connector No.41 terminal and
30A fusible link (J).
Is the inspection result normal?
YES >> Perform the trouble diagnosis for power supply circuit. Refer to PG-11, "Wiring Diagram - BAT-
TERY POWER SUPPLY -".
NO >> Repair or replace error-detected parts.
3.CHECK TERMINALS AND HARNESS CONNECTORS
Check the pin terminals for damage or loose connection with each harness connector.
Is the inspection result normal?
YES >> Replace transfer control unit. Refer to DLN-107, "Removal and Installation".
NO >> Repair or replace error-detected parts.
DTC Display item Malfunction detected condition Possible cause
P181C MOTOR POWER SUPPLY When transfer control actuator power
supply is lower or higher than normalMalfunction of transfer control actuator
(transfer motor) powe
r supply circuit
+ −
Voltag e
Transfer control unit
Connector Terminal E60 41 46 Battery voltage
Revision: 2010 May2011 QX56

DLN-148
< PRECAUTION >[FRONT FINAL DRIVE: R180A]
PRECAUTIONS
PRECAUTION
PRECAUTIONS
Precaution Necessary for Steering W
heel Rotation after Battery Disconnect
INFOID:0000000006222372
NOTE:
 Before removing and installing any control units, first tu rn the push-button ignition switch to the LOCK posi-
tion, then disconnect bot h battery cables.
 After finishing work, confirm that all control unit connectors are connected properly, then re-connect both
battery cables.
 Always use CONSULT-III to perform self-diagnosis as a part of each function inspection after finishing work.
If a DTC is detected, perform trouble diagnos is according to self-diagnosis results.
For vehicle with steering lock unit, if the battery is disconnected or discharged, the steering wheel will lock and
cannot be turned.
If turning the steering wheel is required with the bat tery disconnected or discharged, follow the operation pro-
cedure below before starting the repair operation.
OPERATION PROCEDURE
1. Connect both battery cables. NOTE:
Supply power using jumper cables if battery is discharged.
2. Turn the push-button ignition switch to ACC position. (At this time, the steering lock will be released.)
3. Disconnect both battery cables. The steering lock wi ll remain released with both battery cables discon-
nected and the steering wheel can be turned.
4. Perform the necessary repair operation.
5. When the repair work is completed, re-connect bot h battery cables. With the brake pedal released, turn
the push-button ignition switch from ACC position to ON position, then to LOCK position. (The steering
wheel will lock when the push-button igniti on switch is turned to LOCK position.)
6. Perform self-diagnosis check of all control units using CONSULT-III.
Precaution for Servicing Front Final DriveINFOID:0000000006222373
 Before starting diagnosis of the vehicle, understand the symptoms well. Perform correct and systematic
operations.
 Check for the correct installation status prior to re moval or disassembly. When matching marks are required,
be certain they do not interfere with the f unction of the parts they are applied to.
 Overhaul should be done in a clean work area, a dust proof area is recommended.
 Before disassembly, completely remove sand and mud from the exterior of the unit, preventing them from
entering into the unit during disassembly or assembly.
 Always use shop paper for cleaning the inside of components.
 Avoid using cotton gloves or a shop cloth to prevent the entering of lint.
 Check appearance of the disassembled parts for dam age, deformation, and abnormal wear. Replace them
with new ones if necessary.
 Gaskets, seals and O-rings should be replaced any time the unit is disassembled.
 Clean and flush the parts sufficiently and blow them dry.
 Be careful not to damage sliding surfaces and mating surfaces.
 When applying sealant, remove the old sealant from the mating surface; then remove any moisture, oil, and
foreign materials from the application and mating surfaces.
 In principle, tighten nuts or bolts gradually in severa l steps working diagonally from inside to outside. If a
tightening sequence is specified, observe it.
 During assembly, observe the specified tightening torque.
 Add new differential gear oil, petroleum jelly, or multi-purpose grease, as specified.
Revision: 2010 May2011 QX56

PRECAUTIONSEC-9
< PRECAUTION > [VK56VD]
C
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G H
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M A
EC
NP
O
PRECAUTION
PRECAUTIONS
Precaution for Supplemental
Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000006219727
The Supplemental Restraint System such as “A IR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severi ty of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the “SRS AIR BAG” and “SEAT BELT” of this
Service Manual.
WARNING:
• To avoid rendering the SRS inoper ative, which could increase the risk of personal injury or death in
the event of a collision that would result in air ba g inflation, all maintenance must be performed by
an authorized NISSAN/INFINITI dealer.
 Improper maintenance, including in correct removal and installation of the SRS, can lead to personal
injury caused by unintentional act ivation of the system. For removal of Spiral Cable and Air Bag
Module, see the “SRS AIR BAG”.
 Do not use electrical test equipm ent on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identi fied by yellow and/or orange harnesses or har-
ness connectors.
PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS
WARNING:
 When working near the Air Bag Diagnosis Sensor Unit or other Air Bag System sensors with the
ignition ON or engine running, DO NOT use air or electric power tools or strike near the sensor(s)
with a hammer. Heavy vibration could activate the sensor(s) and deploy the air bag(s), possibly
causing serious injury.
 When using air or electric power tools or hammers , always switch the ignition OFF, disconnect the
battery, and wait at least 3 minutes before performing any service.
Precaution for Procedur e without Cowl Top CoverINFOID:0000000006217650
When performing the procedure after removing cowl top cover, cover
the lower end of windshield with urethane, etc.
Precautions For Xenon Headlamp ServiceINFOID:0000000006217651
WARNING:
Comply with the follow ing warnings to prevent any serious accident.
 Disconnect the battery cable (neg ative terminal) or the power supply fuse before installing, remov-
ing, or touching the xenon headlamp (bulb included). The xenon headlamp contains high-voltage
generated parts.
 Never work with wet hands.
 Check the xenon headlamp ON-OFF status after assem bling it to the vehicle. Never turn the xenon
headlamp ON in other conditions. Connect th e power supply to the vehicle-side connector.
(Turning it ON outside the lamp case m ay cause fire or visual impairments.)
 Never touch the bulb glass immediately afte r turning it OFF. It is extremely hot.
PIIB3706J
Revision: 2010 May2011 QX56