2011 INFINITI QX56 warning

WCS-38
< BASIC INSPECTION >
DIAGNOSIS AND REPAIR WORKFLOW
Are self-diagnosis results normal?
YES >> GO TO 4.
NO >> GO TO 5.
4.NARROW DOWN MALFUNCTIONING PARTS BY SYMPTOM DIAGNOSIS
Perform symptom diagnosis and narrow down the malfunctioning parts.
>> GO TO 5.
5.REPAIR OR REPLACE MALFUNCTIONING PARTS
Repair or replace malfunctioning parts.
NOTE:
If DTC is displayed, erase DTC after repairing or replacing malfunctioning parts.
>> GO TO 6.
6.FINAL CHECK
Check that the warning buzzer in the combination meter operates normally.
Does it operate normally?
YES >> INSPECTION END
NO >> GO TO 1.
Revision: 2010 May2011 QX56

WCS-44
< SYMPTOM DIAGNOSIS >
THE LIGHT REMINDER WARNING DOES NOT SOUND
SYMPTOM DIAGNOSIS
THE LIGHT REMINDER WARNING DOES NOT SOUND
DescriptionINFOID:0000000006222532
Light reminder warning chime does not sound even though headlamp is illuminated.
Diagnosis ProcedureINFOID:0000000006222533
1.CHECK COMBINATION SWITCH (LIGHTING SWITCH) OPERATION
Check that the headlamps operate normally by operat ing the combination switch (lighting switch).
Do they operate normally?
YES >> GO TO 2.
NO >> Refer to EXL-113, "
Symptom Table".
2.CHECK DRIVER SIDE DOOR SWITCH SIGNAL CIRCUIT
Perform the check for the driver side door switch signal circuit. Refer to DLK-117, "
Diagnosis Procedure".
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair harness or connector.
3.CHECK DRIVER SIDE DOOR SWITCH
Perform a unit check for the driver side door switch. Refer to DLK-119, "
Component Inspection".
Is the inspection result normal?
YES >> Replace BCM. Refer to BCS-81, "Removal and Installation".
NO >> Replace driver side door switch. Refer to DLK-254, "
Removal and Installation".
Revision: 2010 May2011 QX56

WCS
THE SEAT BELT WARNING CONTINUES SOUNDING, OR DOES NOT SOUND
WCS-45
< SYMPTOM DIAGNOSIS >
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THE SEAT BELT WARNING CONTIN UES SOUNDING, OR DOES NOT
SOUND
DescriptionINFOID:0000000006222694
 Seat belt warning chime does not sound.
 Seat belt warning chime sounds continuously.
Diagnosis ProcedureINFOID:0000000006222695
1.CHECK SEAT BELT WARNING LAMP
1. Turn ignition switch ON.
2. Check the operation of the seat belt warning lamp in the combination meter.
Is the inspection result normal?
YES >> GO TO 2.
NO >> GO TO 4.
2.CHECK BCM OUTPUT SIGNAL
Check if the seat belt warning chime is acti vated by performing BCM active test. Refer to WCS-20, "
BUZZER :
CONSULT-III Function (BCM - BUZZER)".
Is the inspection result normal?
YES >> INSPECTION END
NO >> GO TO 3.
3.CHECK COMBINATION METER INPUT SIGNAL
Check if buzzer switches to proper condition (On/Off) on data monitor of combination meter. Refer to WCS-14,
"CONSULT-III Function".
Is the inspection result normal?
YES >> Replace combination meter. Refer to MWI-85, "Removal and Installation".
NO >> Replace BCM. Refer to BCS-81, "
Removal and Installation".
4.CHECK SEAT BELT BUCKLE SWITCH (DRIVER SIDE) CIRCUIT
Perform the check for the seat belt buckle switch (driver side) circuit. Refer to WCS-41,
"DiagnosisProcedure".
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair harness or connector.
5.CHECK SEAT BELT BUCKLE SWITCH (DRIVER SIDE)
Perform a unit check for the seat belt buckle switch (driver side). Refer to WCS-42, "
Component Inspection".
Is the inspection result normal?
YES >> Replace combination meter. Refer to MWI-85, "Removal and Installation".
NO >> Replace seat belt buckle (driver side). Refer to SB-8, "
SEAT BELT BUCKLE : Removal and Instal-
lation".
Seat belt fastened : OFF
Seat belt not fastened : ON
Buzzer active condition : On
Buzzer non-active condition : Off
Revision: 2010 May2011 QX56

WCS-46
< SYMPTOM DIAGNOSIS >
THE PARKING BRAKE RELEASE WARNING CONTINUES SOUNDING, OR
DOES NOT SOUND
THE PARKING BRAKE RELEASE WARNING CONTINUES SOUNDING, OR
DOES NOT SOUND
DescriptionINFOID:0000000006222534
 The parking brake warning buzzer sounds continuously during vehicle travel though the parking brake is
released.
 The parking brake warning buzzer does not sound at a ll even though driving the vehicle with the parking
brake applied.
Diagnosis ProcedureINFOID:0000000006222535
1.CHECK PARKING BRAKE WARNING LAMP
1. Start the engine.
2. Check the operation of the brake warni ng lamp by operating the parking brake.
Is the inspection result normal?
YES >> Replace combination meter. Refer to MWI-85, "Removal and Installation"
NO >> GO TO 2.
2.CHECK PARKING BRAKE SWITCH SIGNAL CIRCUIT
Perform check for the parking brake switch signal circuit. Refer to WCS-43, "
Diagnosis Procedure".
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair harness or connector.
3.CHECK PARKING BRAKE SWITCH
Perform a unit check for the parking brake switch. Refer to WCS-43, "
Component Inspection".
Is the inspection result normal?
YES >> Replace combination meter. Refer to MWI-85, "Removal and Installation"
NO >> Replace parking brake switch. Refer to PB-5, "Exploded View".
When parking brake is applied : ON
When parking brake is released : OFF
Revision: 2010 May2011 QX56

WT-1
SUSPENSION
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SECTION WT
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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
Revision: 2010 May2011 QX56

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.
Revision: 2010 May2011 QX56

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