INFINITI QX56 2011 Factory Service Manual

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SUSPENSION
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O PCONTENTS
ROAD WHEELS & TIRES
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 TPMS ...................4
Service Notice or Precautions for Road Wheel .........4
PREPARATION ............................................5
PREPARATION .............................................. .....5
Special Service Tools .......................................... ......5
Commercial Service Tools ........................................5
SYSTEM DESCRIPTION ..............................6
COMPONENT PARTS ................................... .....6
Component Parts Location .................................. ......6
Component Description .............................................7
Low Tire Pressure Warning Control Unit ...................7
Transmitter ................................................................7
Tire Pressure Receiver .............................................8
Low Tire Pressure Warning Lamp .............................8
SYSTEM ..............................................................9
System Description ............................................. ......9
Tire Inflation Indicator Function ...............................10
DIAGNOSIS SYSTEM (LOW TIRE PRES-
SURE WARNING CONTROL UNIT) ..................
12
CONSULT-III Function ........................................ ....12
ECU DIAGNOSIS INFORMATION ..............14
LOW TIRE PRESSURE WARNING CON-
TROL UNIT ..................................................... ....
14
Reference Value ................................................. ....14
DTC Inspection Priority Chart .................................17
DTC Index ...............................................................18
WIRING DIAGRAM ......................................19
TIRE PRESSURE MONITORING SYSTEM ......19
Wiring Diagram .................................................... ....19
BASIC INSPECTION ...................................25
DIAGNOSIS AND REPAIR WORK FLOW .......25
Work Flow ............................................................ ....25
ADDITIONAL SERVICE WHEN REPLACING
LOW TIRE PRESSURE WARNING CON-
TROL UNIT ........................................................
27
Description ...............................................................27
Work Procedure .......................................................27
TRANSMITTER WAKE UP OPERATION .........28
Description ...............................................................28
Work Procedure .......................................................28
ID REGISTRATION ...........................................29
Description ...............................................................29
Work Procedure .......................................................29
DTC/CIRCUIT DIAGNOSIS .........................31
C1704, C1705, C1706, C1707 LOW TIRE
PRESSURE .......................................................
31
DTC Logic ............................................................ ....31
Diagnosis Procedure ...............................................31
C1708, C1709, C1710, C1711 TRANSMITTER
(NO DATA) ........................................................
33
DTC Logic ............................................................ ....33
Diagnosis Procedure ...............................................33
C1716, C1717, C1718, C1719 TRANSMITTER
(PRESSURE DATA) ..........................................
37
DTC Logic ............................................................ ....37
Diagnosis Procedure ...............................................37
C1728 RECEIVER ID ........................................39
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WT-2
DTC Logic ...............................................................39
Diagnosis Procedure ..............................................39
C1729 VEHICLE SPEED SIGNAL ....................41
DTC Logic ............................................................ ...41
Diagnosis Procedure ..............................................41
C1750, C1751, C1752, C1753 RECEIVER ........42
DTC Logic ............................................................ ...42
Diagnosis Procedure ..............................................42
C1754 LOW TIRE PRESSURE WARNING
CONTROL UNIT ................................................
45
DTC Logic ............................................................ ...45
Diagnosis Procedure ..............................................45
C1755, C1756, C1757, C1758 POOR RE-
CEIVING CONDITIONS .....................................
47
DTC Logic ............................................................ ...47
Diagnosis Procedure ..............................................47
U1000 CAN COMM CIRCUIT ............................49
Description ........................................................... ...49
DTC Logic ...............................................................49
Diagnosis Procedure ..............................................49
U1010 CONTROL UNIT (CAN) .........................50
Description ........................................................... ...50
DTC Logic ...............................................................50
Diagnosis Procedure ..............................................50
POWER SUPPLY AND GROUND CIRCUIT .....51
Diagnosis Procedure ........................................... ...51
LOW TIRE PRESSURE WARNING LAMP .......52
Component Function Check ................................ ...52
Diagnosis Procedure ..............................................52
SYMPTOM DIAGNOSIS .............................53
TPMS SYMPTOMS ......................................... ...53
Symptom Table ................................................... ...53
LOW TIRE PRESSURE WARNING LAMP
DOES NOT TURN ON .......................................
56
Description ........................................................... ...56
Diagnosis Procedure ..............................................56
LOW TIRE PRESSURE WARNING LAMP
DOES NOT TURN OFF .....................................
57
Description ........................................................... ...57
Diagnosis Procedure ..............................................57
LOW TIRE PRESSURE WARNING LAMP
BLINKS ..............................................................
58
Description ........................................................... ...58
Diagnosis Procedure ............................................ ...58
TIRE INFLATION INDICATOR DOES NOT
ACTIVATE .........................................................
59
Description ........................................................... ...59
Diagnosis Procedure ...............................................59
ID REGISTRATION CANNOT BE COMPLET-
ED ......................................................................
60
Description ........................................................... ...60
Diagnosis Procedure ..............................................60
NOISE, VIBRATION AND HARSHNESS
(NVH) TROUBLESHOOTING ............................
61
NVH Troubleshooting Chart ................................. ...61
PERIODIC MAINTENANCE .......................62
ROAD WHEEL ................................................ ...62
Adjustment ........................................................... ...62
Tire Rotation ...........................................................63
REMOVAL AND INSTALLATION ..............64
ROAD WHEEL TIRE ASSEMBLY ................. ...64
Exploded View ..................................................... ...64
Removal and Installation .........................................64
Inspection ................................................................64
LOW TIRE PRESSURE WARNING CON-
TROL UNIT ........................................................
65
Exploded View ..................................................... ...65
Removal and Installation .........................................65
TRANSMITTER .................................................66
Exploded View ..................................................... ...66
Removal and Installation .........................................66
TIRE PRESSURE RECEIVER ...........................68
Exploded View ..................................................... ...68
FRONT TIRE PRESSURE RECEIVER .................. ...68
FRONT TIRE PRESSURE RECEIVER : Removal
and Installation ........................................................
68
REAR TIRE PRESSURE RECEIVER .......................68
REAR TIRE PRESSURE RECEIVER : Removal
and Installation ..................................................... ...
68
SERVICE DATA AND SPECIFICATIONS
(SDS) .......... ................................................
69
SERVICE DATA AND SPECIFICATIONS
(SDS) .............................................................. ...
69
Road Wheel ......................................................... ...69
Tire Air Pressure .....................................................69
Revision: 2010 May2011 QX56

PRECAUTIONSWT-3
< PRECAUTION >
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PRECAUTION
PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000006256474
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:0000000006256475
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.
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WT-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 TPMSINFOID:0000000006225485
 Low tire pressure warning lamp blinks for 1min, then turns ON when occurring any malfunction except low tire pressure. Erase the self-diagnosis memories for low tire pressure warning control unit, or register the ID
to turn low tire pressure warning lamp OFF. For ID registration, refer to WT-29, "
Work Procedure".
 ID registration is required when replacing or rotating wheel s, replacing transmitter or low tire pressure warn-
ing control unit. Refer to WT-29, "
Work Procedure".
 Replace grommet seal, valve core and cap of transmitter in TPMS, when replacing each tire by reaching the
wear limit. Refer to WT-66, "
Exploded View".
 For tire inflation indicator function, refer to the following.
- When inflating the tires, park the vehicle in the safe area and ensure the safety of the working area.
- Read and understand the tire inflation indicator function prior to use.
- Inflate the tires one at a time.
- If there is no response for approximately 15 seconds or mo re after inflating the tires, cancel the use of the
tire inflation indicator function or move the vehicle approximately 1 m (3.2 ft) backward or forward to try
again. The air filler pressure may be weak or out of service area.
- Despite the high-precision TPMS pressure sensor, an i ndicated value may differ from that of the pressure
gauge.
- Air pressure is measured rather high due to the rise in tire air temperature after driving.
- If TPMS is malfunctioning, the tire inflation indicator is unusable.
Service Notice or Precautions for Road WheelINFOID:0000000006225486
 Genuine NISSAN aluminum wheel is designed for each type of vehicle. Use it on the specified vehicle only.
 Use Genuine NISSAN parts for the wheel nuts.
 Always use them after adjusting the wheel balance. For the balance weights, use Genuine NISSAN alumi-
num wheel weights.
 Use caution when handling the aluminum wheels, because they can be easily scratched. When removing
dirt, do not use any abrasives, a wire brush, or other it ems that may scratch the coating. Use a neutral deter-
gent if a detergent is needed.
 After driving on roads scattered with anti-ici ng salts, wash off the wheels completely.
 When installing road wheels onto the vehicle, always wipe of f any dirt or foreign substances to prevent them
from being trapped between the contact surfaces of wheel.
 Never apply oil to nut and bolt threads.
Revision: 2010 May2011 QX56

PREPARATIONWT-5
< PREPARATION >
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PREPARATION
PREPARATION
Special Service ToolsINFOID:0000000006225487
The actual shapes of Kent-Moore tools may differ fr om those of special service tools illustrated here.
Commercial Service ToolsINFOID:0000000006256479
Tool number
(Kent-Moore No.)
Tool name Description
–
(J-45295)
Transmitter activation tool ID registration
SEIA0462E
To o l n a m e
Description
Power tool Loosening wheel nuts
PBIC0190E
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WT-6
< SYSTEM DESCRIPTION >
COMPONENT PARTS
SYSTEM DESCRIPTION
COMPONENT PARTS
Component Parts LocationINFOID:0000000006225488
1. BCMRefer to BCS-4, "
BODY CONTROL
SYSTEM : Component Parts Loca-
tion". 2. AV control unit
Refer to AV- 9 , "
Component Parts Lo-
cation". 3. ABS actuator and electric unit (con-
trol unit)
Refer to BRC-10, "Component Parts
Location".
4. TCM
*
Refer to TM-10, "A/T CONTROL SYS-
TEM : Component Parts Location" .5. Low tire pressure warning control
unit 6. Transmitter
7. Front tire pressure receiver 8. Rear tire pressure receiver
A. Glove box assembly removed B. Wheel C. Fender protector (rear side)
D. Low tire pressure warning lamp (in
combination meter) E. Inside rear wheel house protector
*: Mainly used for the tire inflation indicator function.
JPEIC0069ZZ
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COMPONENT PARTSWT-7
< SYSTEM DESCRIPTION >
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Component DescriptionINFOID:0000000006225489
*: Mainly used for the tire inflation function.
Low Tire Pressure Warning Control UnitINFOID:0000000006225490
 After the low tire pressure warning control unit (1) receives the tire pressure signal from the tire pressure receiver, it controls the oper-
ation of the low tire pressure warning lamp, hazard warning lamp,
and horn.
NOTE:
The hazard warning lamp and the horn are used for the tire infla-
tion indicator function.
 Performs self-diagnosis of the Tire Pressure Monitoring System
(TPMS).
 Controls tire inflation indicator function.
TransmitterINFOID:0000000006225491
The transmitter (1) is installed at the position of the air valve on the
road wheel (2). It measures the ti re pressure and transmits the tire
pressure information by radio waves.
Component parts Reference/Function
Transmitter WT-7, "
Transmitter"
Tire pressure receiverWT-8, "Tire Pressure Receiver"
Low tire pressure warning control unit WT-7, "Low Tire Pressure Warning Control Unit"
Low tire pressure warning lamp WT-8, "Low Tire Pressure Warning Lamp"
AV control unit AV- 1 0 , "Component Description"
BCMBCS-6, "BODY CONTROL SYSTEM : System Description"
ABS actuator and electric unit (control unit)BRC-16, "System Description"
TCM*TM-10, "A/T CONTROL SYSTEM : Component Parts Location"
JPEIC0071ZZ
: Outside
JPEIC0013ZZ
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WT-8
< SYSTEM DESCRIPTION >
COMPONENT PARTS
Tire Pressure Receiver
INFOID:0000000006225492
The front tire pressure receiver (1) and rear tire pressure receiver (2)
receive the tire pressure signal by radio waves from the transmitter
at each wheel, and transmit the tire pressure signal to the low tire
pressure warning control unit.
Low Tire Pressure Warning LampINFOID:0000000006225493
Uses CAN communication from the low tire pressure warning control
unit to illuminate the low tire pressure warning lamp on the combina-
tion meter.
*: Tire pressure at each condition differs. A: Front side
B : Rear side
JPEIC0070ZZ
NNEIC0001ZZ
Condition Low tire pr
essure warning lamp
Ignition switch: OFF OFF
Ignition switch: ON Warning lamp turns on for 1second, then turns OFF.
When tire pressure is low*.
[Less than 189 kPa (1.93 kg/cm
2, 27.4 psi)] ON
Tire pressure monitoring system malfunction Warning lamp blinks 1 minute, then turns ON.
Revision: 2010 May2011 QX56

SYSTEMWT-9
< SYSTEM DESCRIPTION >
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SYSTEM
System DescriptionINFOID:0000000006225494
 During driving, the TPMS (Tire Pressure Monitoring System) receives the signal transmitted from transmitter
installed in each wheel. The low tire pressure warning control unit has pressure judgment and trouble diag-
nosis functions. When the low tire pressure warning control unit detects low inflation pressure or another
unusual symptom, the low tire pressure warning lamps in the combination meter comes on.
 If the tire pressure is less than the specified value, t he low tire pressure warning lamp illuminates that the tire
pressure is less than the specified value.
 Activates the TPMS (Tire Pressure Monitoring Sy stem) when the vehicle speed is 40 km/h (25 MPH) or
more.
 The tire pressure information for each wheel is displayed on the vehicle information display.
 Added tire inflation indicator function to TPMS (Tire Pressure Monitoring System). Refer to WT-10, "
Tire
Inflation Indicator Function".
SYSTEM DIAGRAM
INPUT/OUTPUT SIGNAL
The signal transmission/reception between units via a comm unication line is mainly as listed in the following
table.
JPEIC0084GB
Component parts Signal item
Low tire pressure warning control
unit Transmits the following signals via CAN communication to BCM.
 Low tire pressure
warning lamp signal
 Hazard request signal
 Horn request signal*
Transmits the following signals via CAN communication to the AV control unit.
 Low tire pressure warning lamp signal
 Tire pressure data signal
BCM Transmits the following signal via CAN communication to the combination meter, based on sig-
nals from low tire pressure warning control unit.
 Low tire pressure
warning lamp signal
Transmits the following signal via CAN communication to the IPDM E/R, based on signals from
low tire pressure wa rning control unit.
 Horn request signal*
Receives the following signal via CAN communication from low tire pressure warning control
unit.
 Hazard request signal
AV control unit Receives the following signals via CAN communication from low tire pressure warning control
unit.
 Low tire pressure
warning lamp signal
 Tire pressure data signal
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WT-10
< SYSTEM DESCRIPTION >
SYSTEM
*: Mainly used for the tire inflation indicator function.
LOW TIRE PRESSURE WARNING LAMP CONTROL CONDITION
Uses CAN communication from the low tire pressure warning control unit to illuminate the low tire pressure
warning lamp on the combination meter.
*: Tire pressure at each condition differs.
HAZARD WARNING LAMP CONTROL CONDITION
The low tire pressure warning control unit transmits a hazard request signal to BCM. BCM blinks the hazard
warning lamp, according to the signal.
The hazard warning lamp blinks under the following conditions.
Condition of Blinking The Hazard Warning Lamp When wake-up of registered wheel has been completed. Refer to WT-28, "Work Procedure".
 When ID registration is completed. Refer to WT-29, "
Work Procedure".
 During the use of the tire inflation indicator function.
HORN CONTROL CONDITION
The low tire pressure warning control unit transmits a horn request signal to BCM. BCM controls horn sound,
according to the signal.
The horn sounds under the following condition.
Condition of Sounding Horn During the use of tire inflation indicator function.
Tire Inflation Indicator FunctionINFOID:0000000006225495
 This function operates only when the A/T shift selector position is in P-range with the ignition switch ON or
with the engine started.
NOTE:
The tire inflation indicator function is recommended to use with the engine stopped.
 This function informs the driver of the satisfaction of the recom- mended COLD tire pressure.
The hazard warning lamp blinks when reaching the recommended
COLD tire pressure during radio wave reception. After reaching the
recommended COLD tire pressure, the horn sounds once and the
hazard warning lamp stops blinking.
 When tire pressure becomes a value equal to or more than 30 kPa
(0.31 kg/cm
2, 4 psi) more than the recommended COLD tire pres-
sure, the hazard warning lamp and the horn operates three times.
After deflating the tire and reaching the recommended COLD tire
pressure, the horn sounds only once and the hazard warning lamp
stops blinking.
NOTE:
 After starting to inflate the tire, it takes a few seconds for the tire inflation indicator to function.
ABS actuator and electric unit (con-
trol unit) Transmits the vehicle speed signal (ABS) via CAN communication for low tire pressure warning
control unit.
TCM
*Transmits the P range signal via CAN communication for low tire pressure warning control unit.
Component parts Signal item
Condition Low tire pr
essure warning lamp
Ignition switch: OFF OFF
Ignition switch: ON (System normal) Warning lamp turns on for 1second, then turns OFF.
When tire pressure is low*.
[Less than 189 kPa (1.93 kg/cm
2, 27.4 psi)] ON
Tire pressure monitoring system malfunction Warning lamp blinks 1 minute, then turns ON.
When performing transmitter wake-up operation Refer to WT-28, "
Work Procedure".
JSEIA0214GB
Revision: 2010 May2011 QX56