steering INFINITI QX56 2011 Factory Service Manual

COMPONENT PARTSST-7
< SYSTEM DESCRIPTION >
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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

SYSTEMST-9
< SYSTEM DESCRIPTION >
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SYSTEM
System Description (Heated Steering Wheel)INFOID:0000000006225581
The heated steering wheel switch controls the heated steering wheel relay. When the heated steering wheel
switch is turned on, the heated steering wheel relay is energized and the heated steering wheel system will
operate. The heated steering wheel system will turn of f when the heated steering wheel temperature reaches
approximately 30 °C (86 °F). Heated steering wheel system operati on can also be canceled by pressing the
heated steering wheel switch again. In addition, the heat ed steering wheel switch incorporates a timer and
turns OFF the heated steering wheel relay to exit the heated steering wheel system when the operating time
reaches a certain time.
NOTE:
If the surface temperature of the steering wheel is below 20 °C (68 °F), the system will heat the steering wheel
and cycle off and on to maintain a temperature above 20 °C (68 °F). The indicator light will remain on as long as
the system is on. Push the switch again to turn t he heated steering wheel system off manually. The indicator
light will go off.
SYSTEM DIAGRAM
JSGIA0826GB
Revision: 2010 May2011 QX56

ST-10
< WIRING DIAGRAM >
HEATED STEERING WHEEL
WIRING DIAGRAM
HEATED STEERING WHEEL
Wiring DiagramINFOID:0000000006225582
JCGWM0373GB
Revision: 2010 May2011 QX56

HEATED STEERING WHEELST-11
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JCGWM0390GB
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ST-12
< WIRING DIAGRAM >
HEATED STEERING WHEEL
JCGWM0391GB
Revision: 2010 May2011 QX56

DIAGNOSIS AND REPAIR WORK FLOWST-13
< BASIC INSPECTION >
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BASIC INSPECTION
DIAGNOSIS AND REPAIR WORK FLOW
WorkFlow (Heated Steering Wheel)INFOID:0000000006225583
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 vehicl e that the customer describes.
Inspect the relation of the symptoms and the condition when the symptoms occur.
>> GO TO 3.
3.IDENTIFY THE MALFUNCTIONING SYST EM WITH “SYMPTOM DIAGNOSIS”
Use “Symptom diagnosis” from the symptom inspection re sult 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 PART S WITH “COMPONENT DIAGNOSIS”
Perform the diagnosis with “Component di agnosis” 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 obtai ning the malfunction information from the customer,
referring to the symptom inspection result in step 2.
Are the malfunctions corrected?
YES >> INSPECTION END
NO >> GO TO 2.
Revision: 2010 May2011 QX56

ST-14
< BASIC INSPECTION >
STEERING WHEEL
STEERING WHEEL
InspectionINFOID:0000000006225584
NEUTRAL POSITION STEERING WHEEL
1. Check that steering gear assembly, steering column assembly and steering wheel are installed in the cor-
rect position.
2. Perform neutral position inspection after wheel alignment. Refer to FSU-7, "
Inspection".
3. Set vehicle to the straight-ahead position and c onfirm steering wheel is in the neutral position.
4. Loosen outer socket lock nut and turn inner socket to left and right equally to make fine adjustments if steering wheel is not in the neutral position.
STEERING WHEEL TURNING FORCE
1. Park vehicle on a level and dry surface, set parking brake.
2. Tires need to be inflated the specified pressure. Refer to WT-69, "
Tire Air Pressure".
3. Start the engine.
4. Bring power steering fluid up to adequate operating temperature.
5. Check steering wheel turning force when steering wheel has been turned 540 ° from neutral position.
NOTE:
Multiply the distance (L) from the hook of spring balance to the
center of steering wheel by the measurement value with a spring
balance.
6. If steering wheel turning force is out of the specification, check
rack sliding force and relief hydraulic pressure of oil pump.
Regarding relief hydraulic pressure of oil pump, refer to ST-52, "
Inspection".
RACK SLIDING FORCE
1. Disconnect lower joint and steering knuckle from steering gear assembly. Refer to ST-41, "Exploded
View".
2. Start and run engine at idle to make sure steer ing fluid has reached normal operating temperature.
3. While pulling outer socket slowly in ±11.5 mm ( ±0.453 in) range
from neutral position, make sure rack sliding force is within
specification.
4. If rack sliding force is not within specification, overhaul steering gear assembly.
FRONT WHEEL TURNING ANGLE
1. Check front wheel turning angle after toe-in inspection. Refer to FSU-7, "Inspection".
Fluid temperature : 50 – 80
°C (122 – 176 °F)
Steering wheel turning
force : Refer to
ST-57, "
Steering
Wheel Turning Force".
JSGIA0027ZZ
Fluid temperature : 50 – 80 °C (122 – 176 °F)
Rack sliding force : Refer to ST-58, "
Rack
Sliding Force".
SST090B
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STEERING WHEELST-15
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2. Place front wheels on turning radius gauges and rear wheels on stands, so that vehicle can be level.
3. Check the maximum inner and outer wheel turning angles for LH and RH road wheels.
4. With the engine at idle, turn steering wheel from full left stop to full right stop and measure the turning angles.
 Steering angles are not adjustable. Check steering gear
assembly, steering column assembly and front suspension
components for wear or damage if any of the turning angles
are different from the specified value. Replace any of them, if
any non-standard condition exists.
5. Check the following items when turning angle is out of the stan- dard.
a. Check the neutral position of the rack stroke (L).
b. Disassemble steering gear assembly to check the cause that rack stroke is outside of the standard.
 Steering angles are not adjustable. Check steering gear
assembly, steering column assembly and front suspension
components for wear or damage if any of the turning angles
are different from the specified value. Replace any of them, if
any non-standard condition exists.
FAA0016D
Inner wheel (Angle: A) : Refer to ST-57, "Steering
Angle".
Outer wheel (Angle: B) : Refer to ST-57, "
Steering
Angle".
L : Refer to ST-58, "
Rack Stroke".
SGIA0055E
SGIA0629J
Revision: 2010 May2011 QX56

ST-16
< DTC/CIRCUIT DIAGNOSIS >
HEATED STEERING WHEEL SYSTEM
DTC/CIRCUIT DIAGNOSIS
HEATED STEERING WHEEL SYSTEM
Component Function CheckINFOID:0000000006225585
1.CHECK HEATED STEERING WHEEL SYSTEM
Check operate heated steering wheel system. Refer to ST-9, "
System Description (Heated Steering Wheel)".
Is the inspection result normal?
YES >> Go to ST-16, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006225586
1.CHECK POWER SOURCE AND GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Remove the heated steering wheel. Refer to ST-33, "
Removal and Installation".
3. Turn ignition switch ON.
CAUTION:
Never start the engine.
4. Turn heated steering wheel switch ON.
5. Check voltage between heated steering wheel harness connector terminals.
Is the inspection result normal?
YES >> GO TO 2.
NO >> GO TO 3.
2.CHECK HEATED STEERING WHEEL
Check heated steering wheel. Refer to ST-18, "
Component Inspection (Heated Steering Wheel)".
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace heated steering wheel. Refer to ST-33, "
Removal and Installation".
3.CHECK GROUND CIRCUIT
Check continuity between heated steering wheel harness connector terminal and ground.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair or replace damaged parts.
4.CHECK HARNESS BETWEEN HEATED STEERING WHEEL RELAY AND HEATED STEERING WHEEL
1. Turn ignition switch OFF.
2. Disconnect heated steering wheel relay connector. Refer to ST-7, "
Component Parts Location (Heated
Steering Wheel)".
3. Disconnect heated steering wheel switch connector. Refer to ST-56, "
Removal and Installation".
4. Check continuity between heated steering wheel relay harness connector terminal and heated steering
wheel harness connector terminal.
Heated steering wheel Condition Voltage (Approx.)
Connector Terminal
M303 1 − 2 Within 30 minutes after
turning ON the heated
steering switch.
Battery voltage
Other conditions. 0 V
Heated steering wheel GroundContinuity
Connector Terminal
M303 2 Existed
Revision: 2010 May2011 QX56