2011 INFINITI QX56 steering

ST-1
STEERING
C
DE
F
H I
J
K L
M
SECTION ST
A
B
ST
N
O P
CONTENTS
STEERING SYSTEM
PRECAUTION ................ ...............................3
PRECAUTIONS .............................................. .....3
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ............................................................. ......
3
Precaution Necessary for Steering Wheel Rota-
tion after Battery Disconnect .....................................
3
Service Notice or Precautions for Steering System
......
4
PREPARATION ............................................5
PREPARATION .............................................. .....5
Special Service Tools .......................................... ......5
Commercial Service Tools ........................................6
SYSTEM DESCRIPTION ..............................7
COMPONENT PARTS ................................... .....7
Component Parts Location (Heated Steering
Wheel) ................................................................. ......
7
Component Description (Heated Steering Wheel) ......7
Heated Steering Wheel .............................................7
Heated Steering Wheel Switch .................................8
Heated Steering Wheel Relay ...................................8
SYSTEM ..............................................................9
System Description (Heated Steering Wheel) ..... ......9
WIRING DIAGRAM ......................................10
HEATED STEERING WHEEL ........................ ....10
Wiring Diagram ................................................... ....10
BASIC INSPECTION ...................................13
DIAGNOSIS AND REPAIR WORK FLOW .... ....13
WorkFlow (Heated Steering Wheel) .................... ....13
STEERING WHEEL ............................................14
Inspection ............................................................ ....14
DTC/CIRCUIT DIAGNOSIS .........................16
HEATED STEERING WHEEL SYSTEM ...........16
Component Function Check ................................ ....16
Diagnosis Procedure ...............................................16
Component Inspection (Heated Steering Wheel) ....18
Component Inspection (Heated Steering Wheel
Relay) ......................................................................
19
HEATED STEERING WHEEL SWITCH INDI-
CATOR LAMP ...................................................
20
Component Function Check ....................................20
Diagnosis Procedure ...............................................20
Component Inspection (Heated Steering Wheel
Relay) ......................................................................
22
SYMPTOM DIAGNOSIS ..............................23
HEATED STEERING WHEEL SYSTEM DOES
NOT ACTIVATE ................................................
23
Description ........................................................... ....23
Diagnosis Procedure ...............................................23
HEATED STEERING WHEEL SWITCH INDI-
CATOR LAMP DOES NOT TURN ON ..............
26
Description ...............................................................26
Diagnosis Procedure ...............................................26
NOISE, VIBRATION AND HARSHNESS
(NVH) TROUBLESHOOTING ...........................
29
NVH Troubleshooting Chart ....................................29
PERIODIC MAINTENANCE ........................30
POWER STEERING FLUID ..............................30
Inspection ............................................................ ....30
STEERING WHEEL ..........................................32
Inspection ................................................................32
REMOVAL AND INSTALLATION ...............33
Revision: 2010 May2011 QX56

ST-2
STEERING WHEEL ...........................................33
Exploded View ..................................................... ...33
Removal and Installation ........................................33
STEERING COLUMN ........................................34
Exploded View ..................................................... ...34
Removal and Installation ........................................34
Inspection ...............................................................35
STEERING SHAFT ............................................37
Exploded View ..................................................... ...37
Removal and Installation ........................................37
Inspection ...............................................................39
STEERING GEAR AND LINKAGE ....................41
Exploded View ..................................................... ...41
Removal and Installation ........................................42
Disassembly and Assembly ....................................43
Inspection ...............................................................46
POWER STEERING OIL PUMP ........................48
Exploded View ..................................................... ...48
Removal and Installation ........................................49
Disassembly and Assembly ....................................50
Inspection ...............................................................52
HYDRAULIC LINE .......................................... ...54
Exploded View ..................................................... ...54
HEATED STEERING WHEEL SWITCH ............56
Exploded View ..................................................... ...56
Removal and Installation .........................................56
SERVICE DATA AND SPECIFICATIONS
(SDS) .......... ................................................
57
SERVICE DATA AND SPECIFICATIONS
(SDS) .............................................................. ...
57
General Specifications ......................................... ...57
Steering Wheel Axial End Play and Play ................57
Steering Wheel Turning Force ................................57
Steering Angle ........................................................57
Steering Column Length .........................................57
Steering Column Mounting Dimensions ..................57
Steering Column Operating Range .........................57
Steering Shaft Sliding Range ..................................58
Rack Sliding Force ..................................................58
Rack Stroke ............................................................58
Socket Swing Force and Rotating Torque ..............58
Socket Axial End Play .............................................58
Inner Socket Length ................................................58
Relief Oil Pressure ..................................................58
Revision: 2010 May2011 QX56

PRECAUTIONSST-3
< PRECAUTION >
C
DE
F
H I
J
K L
M A
B
ST
N
O P
PRECAUTION
PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000006272045
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:0000000006272046
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

ST-4
< PRECAUTION >
PRECAUTIONS
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 igniti on switch is turned to LOCK position.)
6. Perform self-diagnosis check of all control units using CONSULT-III.
Service Notice or Precautions for Steering SystemINFOID:0000000006225573
 In case of removing steering gear assembly, make the final tightening with grounded and unloaded vehicle condition, and then check wheel alignment.
 Observe the following precautions when disassembling.
- Before disassembly, thoroughly clean the outside of the unit.
- Disassembly should be done in a clean work area. It is im portant to prevent the internal parts from becoming
contaminated by dirt or other foreign matter.
- For easier and proper assembly, place disassembled parts in order on a parts rack.
- Use nylon cloth or paper towels to clean the parts; co mmon shop rags can leave lint that might interfere with
their operation.
- Never reuse non-reusable parts.
- Before assembling, apply the specified grease to the directed parts.
Revision: 2010 May2011 QX56

PREPARATIONST-5
< PREPARATION >
C
DE
F
H I
J
K L
M A
B
ST
N
O P
PREPARATION
PREPARATION
Special Service ToolsINFOID:0000000006225574
The actual shapes of Kent-Moore t ools may differ from those of special service tools illustrated here.
Tool number
(Kent-Moore No.)
Tool name Description
ST27180001
(J-25726-A)
Steering wheel puller Removing steering wheel
ST3127S000
(J-25765-A)
Preload gauge Inspecting sliding torque, steering torque, and
rotating torque for ball joint
KV48103400
(—)
Preload adapter Inspecting rotating torque
KV40107300
(—)
Boot band crimping tool Installing boot band
KV48103500
(J-26357)
Oil pressure gauge Measuring oil pump relief pressure
KV48102500
(J-33914)
Oil pressure gauge adapter Measuring oil pump relief pressure
ZZA0819D
ZZA0806D
ZZA0824D
ZZA1229D
S-NT547
S-NT542
Revision: 2010 May2011 QX56

ST-6
< PREPARATION >
PREPARATION
Commercial Service Tools
INFOID:0000000006225575
Tool name Description
Power tool Loosening bolts and nuts
Ball joint remover Remove steering outer socket
Drift
a: 35 mm (1.38 in) dia.
b: 21 mm (0.83 in) dia. Installing oil pump oil seal
PBIC0190E
S-NT146
S-NT474
Revision: 2010 May2011 QX56

COMPONENT PARTSST-7
< SYSTEM DESCRIPTION >
C
DE
F
H I
J
K L
M A
B
ST
N
O P
SYSTEM DESCRIPTION
COMPONENT PARTS
Component Parts Locatio n (Heated Steering Wheel)INFOID:0000000006225576
Component Description (Heated Steering Wheel)INFOID:0000000006225577
Heated Steering WheelINFOID:0000000006225578
The heated steering wheel is activated by the pow er supply from the heated steering wheel relay.
1. Heated steering wheel relay 2. Heated steering wheel switch 3. Heated steering wheel
A. Engine room right side
JSGIA0824ZZ
Part name Reference/Function
Heated steering wheel Heating element Refer to ST-7, "
Heated Steering Wheel".
Thermostat
Heated steering wheel relay Refer to ST-8, "
Heated Steering Wheel Relay".
Heated steering wheel switch Timer Refer to ST-8, "
Heated Steering Wheel Switch".
Revision: 2010 May2011 QX56

ST-8
< SYSTEM DESCRIPTION >
COMPONENT PARTS
Furthermore, the heated steering wheel incorporates a heating element and a thermostat to control heated
steering wheel temperatures.
 Heating element: Heat is generated by the passage of an electric current.
 Thermostat: ON/OFF operation of power supply at a certain temperature.
Heated Steering Wheel SwitchINFOID:0000000006225579
 Controls the heated steering wheel relay and operates the heated steering wheel system.
The heated steering wheel switch incorporates a ti mer and turns OFF the heated steering wheel relay when
operating time reaches a certain time.
- Timer: ON/OFF operation of the heated st eering wheel relay at a certain time.
 Turns the indicator lamp ON when the system is activated.
Heated Steering Wheel RelayINFOID:0000000006225580
Operates the heated steering system with the control signal from the heated steering wheel switch.
Revision: 2010 May2011 QX56