2011 INFINITI QX56 ignition

SBC-58
< DTC/CIRCUIT DIAGNOSIS >
SEAT BELT WARNING LAMP CIRCUIT
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair or replace harness or connector.
3.CHECK SEAT BELT ASSEMBLY (PASSENGER SIDE)
Check seat belt assembly (passenger side).
Refer to SBC-58, "
Component Inspection [Seat Belt Assembly (Passenger Side)]".
Is the inspection result normal?
YES >> GO TO 4.
NO >> Replace seat belt assembly (passenger side). Refer to SB-6, "
SEAT BELT RETRACTOR :
Removal and Installation".
4.CHECK SEAT BELT WARNING LAMP CIRCUIT
1. Disconnect combination meter harness connector.
2. Check continuity between air bag diagnosis sensor unit harness connector and combination meter har- ness connector.
3. Check continuity between seat belt warning unit and ground.
Is the inspection results normal?
YES >> GO TO 5.
NO >> Replace harness or connector.
5.CHECK COMBINATION METER POWE R SUPPLY AND GROUND CIRCUIT
Check combination meter power supply and ground circuit.
Refer to MWI-64, "
COMBINATION METER : Diagnosis Procedure".
Is the inspection result normal?
YES >> GO TO 6.
NO >> Repair or replace harness or connector.
6.REPLACE COMBINATION METER
Replace combination meter.
Refer to MWI-85, "
Removal and Installation".
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace air bag diagnosis sensor unit. Refer to SR-26, "
Removal and Installation".
Component Inspection [Seat Belt Assembly (Passenger Side)]INFOID:0000000006237939
1.CHECK SEAT BELT ASSEMBLY (PASSENGER SIDE)
1. Turn ignition switch OFF.
2. Disconnect seat belt assembly (passenger side) harness connector.
3. Check continuity between seat belt assembly (passenger side) terminals.
Seat belt assembly (passenger side)
GroundContinuity
Connector Terminal
B245 4 Existed
Air bag diagnosis sensor unit Combination meter Continuity
Connector Terminal Connector Terminal
M5924M3436Existed
Air bag diagnosis sensor unit GroundContinuity
Connector Terminal
M59 24 Not existed
Revision: 2010 May2011 QX56

SCS-4
< PRECAUTION >[HBMC]
PRECAUTIONS
PRECAUTION
PRECAUTIONS
Precaution for Supplemental Restraint S
ystem (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000006256134
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:0000000006256136
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

PRECAUTIONSSCS-5
< PRECAUTION > [HBMC]
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5. When the repair work is completed, re-connect both 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 ignition switch is turned to LOCK position.)
6. Perform self-diagnosis check of a ll control units using CONSULT-III.
Precaution for Procedure without Cowl Top CoverINFOID:0000000006256138
When performing the procedure after removing cowl top cover, cover
the lower end of windshield with urethane, etc.
Precaution for Hydraulic Body-Motion Control SystemINFOID:0000000006255996
WARNING:
 Always check the piping for loose co nnections, damage, or twists before starting operation, since
pressure in hydraulic circuit becom es high during air bleeding operation.
 When repairing or replacing a malfunctioning pa rt, always release pressure from hydraulic circuit,
since dangerous conditions may be created when oil leakage occurs during air bleeding operation.
 Clean surrounding areas of oil inlet and air bleeder usi ng steam before starting operation, since there may
be mud on it.
 Always decrease pressure when removing a system related part, since system pressure is high.
 Seal the removed part using vinyl tape for preventi ng dirt from getting on or entering the removed part.
 Check system pressure again 1 day or more after bleeding operation is complete, since system pressure may decrease when air bleeding is insufficient.
 Use Genuine NISSAN Hydraulic Suspension Fluid for suspension fluid.
 Never reuse drained suspension fluid.
 Check for suspension fluid leakage after removing a system-related part.
PIIB3706J
Revision: 2010 May2011 QX56

PRECAUTIONSSCS-47
< PRECAUTION > [AIR LEVELIZER CONTROL SYSTEM]
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PRECAUTION
PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000006256135
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 Necessary for Steering Wh eel Rotation after Battery Disconnect
INFOID:0000000006256137
NOTE:
 Before removing and installing any control units, first tu rn the push-button ignition switch to the LOCK posi-
tion, then disconnect both 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 batte ry 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 wil l 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

SCS-48
< PRECAUTION >[AIR LEVELIZER CONTROL SYSTEM]
PRECAUTIONS
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 Procedure without Cowl Top CoverINFOID:0000000006256139
When performing the procedure after removing cowl top cover, cover
the lower end of windshield with urethane, etc.
Precaution for Air Levelizer Control SystemINFOID:0000000006256038
 Never allow water and dust to enter the inside of air compressor.
 Never disassemble the vehicle height sensor.
PIIB3706J
Revision: 2010 May2011 QX56

COMPONENT PARTSSCS-51
< SYSTEM DESCRIPTION > [AIR LEVELIZER CONTROL SYSTEM]
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Air Levelizer Control ModuleINFOID:0000000006256042
 Operates ON/OFF of air compressor (exhaust solenoid) , according to signal from vehicle height sensor.
 Transmits CK SUSP indicator lamp signal to the combination meter via CAN communication, when setting of standard vehicle height is incomplete.
 If malfunction is detected, the syste m enters fail-safe mode. Refer to SCS-59, "
Fail-safe".
Vehicle Height SensorINFOID:0000000006256043
Measures vehicle height of vehicle rear and transmits th is information to air levelizer control module according
to electric signal.
Air CompressorINFOID:0000000006256044
Operates according to signal from air levelizer control module via air compressor relay, and charges air in air
chamber of rear shock absorber.
EXHAUST SOLENOID
Operates according to signal from air levelizer control module, and discharges air in air chamber of rear shock
absorber.
Air Compressor RelayINFOID:0000000006256045
Turns ON according to signal from air levelizer control module, and operates air compressor.
CK SUSP Indicator LampINFOID:0000000006256046
 Turns ON for 2 seconds when ignition switch is turned ON, for the purpose of bulb check.
 Turns ON when setting of standard vehicle height is incomplete.
NOTE:
Does not turn ON when the system is malfunctioning.
Air compressor relay SCS-51, "Air Compressor Relay"
CK SUSP indicator lampSCS-51, "CK SUSP Indicator Lamp"
Component parts Reference
Revision: 2010 May2011 QX56

SCS-56
< SYSTEM DESCRIPTION >[AIR LEVELIZER CONTROL SYSTEM]
DIAGNOSIS SYSTEM (AIR
LEVELIZER CONTROL MODULE)
DIAGNOSIS SYSTEM (AIR LE VELIZER CONTROL MODULE)
CONSULT-III FunctionINFOID:0000000006256052
CONSULT-III APPLICATION ITEMS
WORK SUPPORT
CAUTION:
Perform the procedure when the vehicle is stopped.
SELF DIAGNOSTIC RESULTS
Refer to SCS-59, "DTC Index".
When “CRNT” is displayed on self-diagnosis result,
 The system is presently malfunctioning.
When “PAST” is displayed on self-diagnosis result, System malfunction in the past is detect ed, but the system is presently normal.
Freeze frame data (FFD)
DATA MONITOR
Diagnostic test mode Function
Work Support This mode enables a technician to adjust some devices faster and more accurately.
Self Diagnostic Results Retrieve DTC from ECU and display diagnostic items.
Data Monitor Monitor the input/output signal of the control unit in real time.
CAN Diagnosis This mode displays a network diagnosis result about CAN by a diagram.
CAN Diagnostic Support
Monitor It monitors the status of CAN communication.
ECU Identification Display the ECU identification number (part number etc.) of the selected system.
Active Test Send the drive signal from CONSULT-III to the actuator. The operation check can be performed.
Item name Description
STANDARD HEIGHT LEVEL Forcibly sets vehicle height to the set standard vehicle height.
ADJUST HEIGHT INI Sets standard vehicle height.
CLEAR HEIGHT INI Erases standard vehicle height.
Item name Description
IGN COUNTER The number of times that ignition switch is turned ON after the DTC is detected is displayed.
 When “0” is displayed: It indicates that the system is presently malfunctioning.
 When except “0” is displayed: It indicates that system malfunction in the past is detected, but the system
is presently normal.
NOTE:
Each time when ignition switch is turned OFF to ON, numerical number increases in 1 → 2 → 3...38 → 39.
When the operation number of times exceeds 39, the number do not increase and “39” is displayed until
self-diagnosis is erased.
Monitored item (Unit) Remarks
IGN VOLT (V) Displays the power supply voltage of air levelizer control module.
VHCL HT INTLZ STA Displays setting status of standard vehicle height.
VHCL HT INIT SLCT Displays setting status of standard vehicle height.
VHCL HEIGHT SEN (V) Displays the signal voltage of vehicle height sensor.
VHCL HT CNVSN VL (mm) Displays the vehicle height recognized by air levelizer control module.
VHCL HGT FIX TIME (hour) Displays period of time that signal from vehicle height sensor does not change.
Revision: 2010 May2011 QX56

SCS-58
< ECU DIAGNOSIS INFORMATION >[AIR LEVELIZER CONTROL SYSTEM]
AIR LEVELIZER CONTROL MODULE
ECU DIAGNOSIS INFORMATION
AIR LEVELIZER CONTROL MODULE
Reference ValueINFOID:0000000006256053
VALUES ON DIAGNOSIS TOOL
TERMINAL LAYOUT
PHYSICAL VALUES
Item name Condition Value/Status (Approx.)
IGN VOLT Ignition switch ON 10 – 16 V
VHCL HT INTLZ STA Completion of the standard vehicle height setting CMPLT
Other than the above INCMP
VHCL HT INIT SLCT Completion of the standard vehicle height setting 1
Other than the above 0
VHCL HEIGHT SEN Lift up the vehicle 2.8 – 3.8 V
VHCL HT CNVSN VL Lift down the vehicle −15 – 15 mm
VHCL HGT FIX TIME Lift up the vehicle 0 h
VHCL HGT INIT VAL Completion of the standard vehicle height setting 2.800 – 3.800 V
Other than the above 0 V
COMPRESSOR When the air compressor is operating On
Other than the above Off
EXH SOLENOID When exhaust solenoid is operating On
Other than the above Off
ENG SPEED SIG Engine running RUN
Other than the above STOP
WARNING LAMP When CK SUSP indicator lamp is ON On
Other than the above Off
JSDIA0057ZZ
Terminal
(Wire color) Description
ConditionReference value
(Approx.)
+ − Signal name Input/
Output
2
(B) Ground GND — Always Less than 1
Ω
3
(V) Ground Air compressor relay Output IGN ON Air compressor: ON 9 – 16 V
Air compressor: OFF Less than 2 V
4
(L/W) Ground Vehicle height sensor
(GND) — Always Less than 1
Ω
Revision: 2010 May2011 QX56