2011 INFINITI QX56 steering

HEATED STEERING WHEEL SYSTEM DOES NOT ACTIVATE
ST-25
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Is the inspection result normal?
YES >> GO TO 9.
NO >> Repair or replace damaged parts.
9.CHECK HARNESS BETWEEN FUSE BLOCK (J/B) AND HEATED STEERING WHEEL SWITCH
1. Check continuity between fuse block (J/B) connec tor terminal and heated steering wheel switch harness
connector terminal.
2. Check continuity between fuse block (J/B) harness connector terminal and ground.
Is the inspection result normal?
YES >> GO TO 10.
NO >> Repair or replace damaged parts.
10.DETECT MALFUNCTIONING ITEM
Check the following.
 Ignition switch
 Harness for short or open between ignition s witch and fuse block (J/B). Refer to PG-11, "
Wiring Diagram -
BATTERY POWER SUPPLY -".
 10A fuse [No.3, located in the fuse block (J/B)]. Refer to PG-143, "
Fuse, Connector and Terminal Arrange-
ment".
 Fuse block (J/B)
Is the inspection result normal?
YES >> Replace heated steering wheel switch. Refer to ST-56, "Removal and Installation".
NO >> Repair or replace damaged parts.
Fuse block (J/B) Heated steering wheel switch Continuity
Connector Terminal Connector Terminal
M1 2A M52 1 Existed
Fuse block (J/B) GroundContinuity
Connector Terminal
M1 2A Not existed
Revision: 2010 May2011 QX56

ST-26
< SYMPTOM DIAGNOSIS >
HEATED STEERING WHEEL SWITCH INDICATOR LAMP DOES NOT TURN ON
HEATED STEERING WHEEL SWITCH INDICATOR LAMP DOES NOT
TURN ON
Description INFOID:0000000006225594
 Heated steering wheel switch indicator lamp does not turn on the lamp.
 Heated steering wheel switch indicator lamp does not turn off the lamp.
Diagnosis ProcedureINFOID:0000000006225595
1.CHECK POWER SOURCE AND GROUND CIRCUIT
1. Turn ignition switch ON. CAUTION:
Never start the engine.
2. Turn heated steering wheel switch ON.
3. Check voltage between heated steering wheel switch harness connector terminals.
Is the inspection result normal?
YES >> GO TO 7.
NO >> GO TO 2.
2.CHECK GROUND CIRCUIT
Check continuity between heated steering wheel switch harness connector terminal and ground.
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair or replace damaged parts.
3.CHECK HARNESS BETWEEN HEATED STEERING WHEEL RELAY AND HEATED STEERING WHEEL
SWITCH
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 switch harness connector terminal.
5. Check continuity between heated steering w heel relay harness connector terminal and ground.
Heated steering wheel
Condition Voltage (Approx.)
Connector Terminal
M52 5 − 6 Within 30 minutes after
turning ON the heated
steering switch.
Battery voltage
Other conditions. 0 V
Heated steering wheel switch GroundContinuity
Connector Terminal
M52 6 Existed
Heated steering wheel relay Heated steering wheel switch Continuity
Connector Terminal Connector Terminal
E90 5 M52 5 Existed
Heated steering wheel relay GroundContinuity
Connector Terminal
E90 5 Not existed
Revision: 2010 May2011 QX56

HEATED STEERING WHEEL SWITCH INDICATOR LAMP DOES NOT TURN ON
ST-27
< SYMPTOM DIAGNOSIS >
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Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair or replace damaged parts.
4.CHECK HEATED STEERING WHEEL RELAY
Check heated steering wheel relay. Refer to ST-22, "
Component Inspection (Heated Steering Wheel Relay)".
Is the inspection result normal?
YES >> GO TO 5.
NO >> Replace heated steering wheel relay. Refer to ST-7, "
Component Parts Location (Heated Steering
Wheel)".
5.CHECK HARNESS BETWEEN HEATED STEERING WHEEL RELAY AND HEATED STEERING WHEEL
SWITCH
1. Check continuity between heated steering wheel relay harness connector terminal and heated steering
wheel switch harness connector terminal.
2. Check continuity between heated steering w heel relay harness connector terminal and ground.
Is the inspection result normal?
YES >> GO TO 7.
NO >> Repair or replace damaged parts.
6.CHECK HARNESS BETWEEN FUSE BLOCK (J/B) AND HEATED STEERING WHEEL SWITCH
1. Check continuity between fuse block (J/B) connec tor terminal and heated steering wheel switch harness
connector terminal.
2. Check continuity between fuse block (J/B) harness connector terminal and ground.
Is the inspection result normal?
YES >> GO TO 7.
NO >> Repair or replace damaged parts.
7.DETECT MALFUNCTIONING ITEM
Check the following.
 Ignition switch
 Harness for short or open between ignition s witch and fuse block (J/B). Refer to PG-11, "
Wiring Diagram -
BATTERY POWER SUPPLY -".
 10A fuse [No.3, located in the fuse block (J/B)]. Refer to PG-143, "
Fuse, Connector and Terminal Arrange-
ment".
 Fuse block (J/B)
Is the inspection result normal?
YES >> Replace heated steering wheel switch. Refer to ST-56, "Removal and Installation".
Heated steering wheel relay Heated steering wheel switch
Continuity
Connector Terminal Connector Terminal
E90 2 M52 2 Existed
Heated steering wheel relay GroundContinuity
Connector Terminal
E90 2 Not existed
Fuse block (J/B) Heated steering wheel switch Continuity
Connector Terminal Connector Terminal
M1 2A M52 1 Existed
Fuse block (J/B) GroundContinuity
Connector Terminal
M1 2A Not existed
Revision: 2010 May2011 QX56

ST-28
< SYMPTOM DIAGNOSIS >
HEATED STEERING WHEEL SWITCH INDICATOR LAMP DOES NOT TURN ON
NO >> Repair or replace damaged parts.
Revision: 2010 May2011 QX56

NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTINGST-29
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NOISE, VIBRATION AND HARSHN ESS (NVH) TROUBLESHOOTING
NVH Troubleshooting ChartINFOID:0000000006225596
Use the chart below to find the cause of the symp tom. If necessary, repair or replace these parts.
×: ApplicableReference
ST-30, "
Inspection
"
ST-30, "
Inspection
"
ST-46, "
Inspection
"
ST-46, "
Inspection
"
ST-46, "
Inspection
"
ST-30, "
Inspection
"
ST-32, "
Inspection
"
ST-32, "
Inspection
"
EM-20, "
Checking
"
ST-32, "
Inspection
"—
ST-41, "
Exploded View
"
ST-35, "
Inspection
"
ST-34, "
Exploded View
"
ST-41, "
Exploded View
"
NVH in DLN section.
NVH in DLN section.
NVH in FAX, RAX, FSU, RSU section.
NVH in WT section.
NVH in WT section.
NVH in FAX, RAX section.
NVH in BR section.
Possible cause and SUSPECTED PARTS
Fluid level
Air in hydraulic system
Outer/inner socket ball joint swinging torque
Outer/inner socket ball joint rotating torque
Outer/inner socket ball joint end play
Steering fluid leakage
Steering wheel play
Steering gear rack sliding force
Drive belt looseness
Improper steering wheel
Improper installation or looseness of tilt lock lever
Mounting looseness
Steering column deformation or damage
Improper installation or looseness of steering column
Steering linkage looseness
PROPELLER SHAFT
DIFFERENTIAL
AXLE and SUSPENSION
TIRE
ROAD WHEEL
DRIVE SHAFT
BRAKE
Symptom Steering Noise
××××××××× ×× ×××××××
Shake × × × ×××××
Vibration ××××××××
Shimmy ×× × ××××
Judder ××××××
Revision: 2010 May2011 QX56

ST-30
< PERIODIC MAINTENANCE >
POWER STEERING FLUID
PERIODIC MAINTENANCE
POWER STEERING FLUID
InspectionINFOID:0000000006225597
FLUID LEVEL
1. Check fluid level with engine stopped.
2. Ensure that fluid level is between MIN and MAX.
3. Fluid levels at HOT and COLD are different. Do not confuse
them.
CAUTION:
 The fluid level should not exceed the MAX line. Excessive flui d causes fluid leakage from the
cap.
 Never reuse drained power steering fluid.
 Always use the specified fluid. Refer to MA-10, "
Fluids and Lubricants".
FLUID LEAKAGE
Check hydraulic connections for fluid leakage, cracks, damage,
looseness, or wear.
1. Run engine until the fluid temperature reaches 50 to 80 °C (122
to 176 °F) in reservoir tank, and keep engine speed idle.
2. Turn steering wheel several times from full left stop to full right stop.
3. Hold steering wheel at each lock position for five seconds and carefully, check for fluid leakage.
CAUTION:
Never hold the steering wheel in a locked position for more
than 10 seconds. (There is the possibility that power steer-
ing oil pump assembly may be damaged.)
4. If fluid leakage at connections is noticed, then loos en flare nut and then retighten. Do not overtighten con-
nector as this can damage O-ring, washer and connector.
5. If fluid leakage from oil pump is noticed, check oil pump. Refer to ST-52, "
Inspection".
6. Check steering gear boots for accumulation of fluid indicating from steering gear.
AIR BLEEDING HYDRAULIC SYSTEM
If air bleeding is not complete, the following symptoms can be observed.
 Bubbles are created in reservoir tank.
 Clicking noise can be heard from oil pump.
 Excessive buzzing in the oil pump. NOTE:
Fluid noise may occur in the steering gear or oil pump. This does not affect performance or durability of the
system.
1. Turn steering wheel several times from full left stop to full right stop with engine off. CAUTION:
Fill reservoir tank with a sufficien t amount of fluid so that fluid level is not below the MIN line while
turning steering wheel.
2. Start engine and hold steering wheel at each lock position for 3 seconds at idle to check for fluid leakage.
HOT : Fluid temperature 50 – 80
°C (122 – 176 °F)
COLD : Fluid temperature 0 – 30 °C (32 – 86 °F)
Recommended fluid : Refer to MA-10, "
Fluids
and Lubricants".
Fluid capacity : Refer to ST-57, "
General
Specifications".
SGIA0232J
SGIA0506E
Revision: 2010 May2011 QX56

POWER STEERING FLUIDST-31
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3. Repeat step 2 above several times at approximately 3 seconds intervals. CAUTION:
Never hold the steering wheel in a locked positio n for more than 10 seconds. (There is the possi-
bility that oil pump may be damaged.)
4. Check fluid for bubbles and while contamination.
5. Stop engine if bubbles and white contamination do not drain out. Perform step 2 and 3 above after waiting
until bubbles and white contamination drain out.
6. Stop the engine, and then check fluid level.
Revision: 2010 May2011 QX56

ST-32
< PERIODIC MAINTENANCE >
STEERING WHEEL
STEERING WHEEL
InspectionINFOID:0000000006225598
STEERING WHEEL AXIAL END PLAY
1. Check installation conditions of steering gear assembly, front suspension assembly, axle and steering col-
umn assembly.
2. Check if movement exists when steering wheel is moved up and down, to the left and right and to the axial direction.
3. Check the following items when steering w heel axial end play is out of the standard.
 Check the steering column assembly mounting condition. Refer to ST-34, "
Exploded View".
 Check steering gear assembly mounting condition for looseness. Refer to ST-41, "
Exploded View".
STEERING WHEEL PLAY
1. Turn steering wheel so that front wheels come to the straight-ahead position.
2. Start engine and lightly turn steering wheel to the left and right until front wheels start to move.
3. Measure steering wheel movement on the outer circumference.
4. Check the following items when steeri ng wheel play is out of the standard.
 Check backlash for each joint of steering column assembly.
 Check installation condition of steering gear assembly. Steering wheel axial end play : Refer to
ST-57, "
Steering Wheel Axial End Play and Play".
Steering wheel play : Refer to ST-57, "
Steering Wheel Axial End Play and Play".
Revision: 2010 May2011 QX56