2011 INFINITI QX56 BATTERY

WCS
PRECAUTIONSWCS-3
< PRECAUTION >
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PRECAUTION
PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000006369725
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.
Revision: 2010 May2011 QX56

WCS
DIAGNOSIS SYSTEM (BCM)WCS-19
< SYSTEM DESCRIPTION >
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DIAGNOSIS SYSTEM (BCM)
COMMON ITEM
COMMON ITEM : CONSULT-III Fu nction (BCM - COMMON ITEM)INFOID:0000000006419721
APPLICATION ITEM
CONSULT-III performs the following functions via CAN communication with BCM.
SYSTEM APPLICATION
BCM can perform the following functions for each system.
NOTE:
It can perform the diagnosis modes except the following for all sub system selection items.
×: Applicable item
*: This item is indicated, but not used.
FREEZE FRAME DATA (FFD)
The BCM records the following vehicle condition at the time a particular DTC is detected, and displays on
CONSULT-III.
Diagnosis mode Function Description
Work Support Changes the setting for each system function.
Self Diagnostic Result Displays the diagnosis results judged by BCM. Refer to BCS-57, "
DTCIndex".
CAN Diag Support Monitor Monitors the reception status of CAN communication viewed from BCM. Refer to CONSULT-III opera-
tion manual.
Data Monitor The BCM input/output signals are displayed.
Active Test The signals used to activate each device are forcibly supplied from BCM.
Ecu Identification The BCM part number is displayed.
Configuration  Read and save the vehicle specification.
 Write the vehicle specification when replacing BCM.
System Sub system selection item Diagnosis mode
Work Support Data Monitor Active Test
Door lock DOOR LOCK ×××
Rear window defo gger REAR DEFOGGER ××
Warning chime BUZZER ××
Interior room lamp timer INT LAMP ×××
Exterior lamp HEAD LAMP ×××
Wiper and washer WIPER ×××
Turn signal and hazard warning lamps FLASHER ×××
— AIR CONDITONER* ××
 Intelligent Key system
 Engine start system INTELLIGENT KEY
×××
Combination switch COMB SW ×
Body control system BCM ×
IVIS IMMU ×××
Interior room lamp battery saver BATTERY SAVER ×××
Back door TRUNK ×
Vehicle security system THEFT ALM ×××
RAP system RETAINED PWR ×
Signal buffer system SIGNAL BUFFER ××
Revision: 2010 May2011 QX56

WCS-24
< ECU DIAGNOSIS INFORMATION >
COMBINATION METER
DCA INDIgnition switch
ONNOTE:
This item is displayed, but cannot be moni-
tored.
Off
CHECK SUS IND Ignition switch
ONCK SUSP indicator lamp ON On
CK SUSP indicator lamp OFF Off
LCD Ignition switch
ON
During engine start in
formation indication B&P I
Ignition switch
ACC During engine start information indication B&P N
Ignition switch
LOCK During key ID warning indication ID NG
Ignition switch
LOCK During steering lock information indication ROTAT
Ignition switch
LOCK During P position warning indication SFT P
Ignition switch
LOCK During Intelligent Key insert information in-
dication
INSRT
Ignition switch
LOCK During Intelligent Key low battery warning
indication
BATT
Ignition switch
ON During take away warning indication NO KY
Ignition switch
LOCK During key warnin
g indication OUTKY
Ignition switch
ON During ACC warning indication LK WN
ACC TARGET Ignition switch
ONDuring vehicle ahead detection indicator in-
dication
On
Other than the above Off
ACC DISTANCE Ignition switch
ONWhen following distance set to “LONG” LONG
When following distance set to “MIDDLE” MID
When following distance set to “SHORT” SHORT
Set distance indicator not displayed Off
ACC OWN VHL Ignition switch
ONDuring own vehicle indicator indication On
Other than the above Off
ACC SET SPEED Ignition switch
ONDuring set vehicle speed indicator not dis-
played
Off
During set vehicle speed indicator dis-
played Indicates the set vehicle speed
ACC UNIT Ignition switch
ONSet vehicle speed indicator unit display ON On
Set vehicle speed indicator unit display OFF Off
Monitor Item Condition Value/Status
Revision: 2010 May2011 QX56

WCS-26
< ECU DIAGNOSIS INFORMATION >
COMBINATION METER
NOTE:
Some items are not available according to vehicle specification.
TERMINAL LAYOUT
PHYSICAL VALUES
TOW MODE INDIgnition switch
ONTOW mode indicator lamp ON On
TOW mode indicator lamp OFF Off
ENTER SW Ignition switch
ONWhen switch (enter switch) is pressed
On
Other than above Off
SELECT SW Ignition switch
ONWhen switch (select switch) is pressed
On
Other than above Off
DISTANCE
[km] Ignition switch
ON
—Distance to empty calculated by com-
bination meter
OUTSIDE TEMP
[ ° C or °F] Ignition switch
ON
—Equivalent to ambient temperature
NOTE:
This may not match the indicated value
on the information display.
FUEL LOW SIG Ignition switch
ONDuring low fuel warning indication On
Other than above Off
BUZZER Ignition switch
ONBuzzer ON On
Buzzer OFF Off
Monitor Item Condition Value/Status
JPNIA0968GB
Te r m i n a l N o .
(Wire color) Description
ConditionVa l u e
(Approx.)
+ – Signal name Input/
Output
1
(Y) Ground Battery power supply Input Ignition
switch
OFF— Battery voltage
2
(GR) Ground Ignition signal Input Ignition
switch
ON
— Battery voltage
3
(B) Ground Ground — Ignition
switch
ON—0 V
7
(R) Ground TOW mode signal Input Ignition
switch
ONWhen TOW mode switch is
pressed
0 V
Other than the above 12 V
8
(P/L) Ground Trip reset switch signal Input Ignition
switch
ONWhen trip reset switch is
pressed
0 V
Other than the above 5 V
Revision: 2010 May2011 QX56

WCS
COMBINATION METERWCS-27
< ECU DIAGNOSIS INFORMATION >
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11
(G) Ground Enter switch signal Input Ignition
switch
ONWhen switch (enter
switch) is pressed
0 V
Other than the above 5 V
12
(O) Ground Select switch signal Input Ignition
switch
ONWhen switch (select
switch) is pressed
0 V
Other than the above 5 V
13
(W/R) Ground
Illumination control switch
signal (+) InputIgnition
switch
ON When switch [illumi-
nation control switch (+)] is
pressed
0 V
Other than the above 5 V
14
(R) Ground Illumination control switch
signal (
−) InputIgnition
switch
ON When switch [illumi-
nation control switch (
−)] is
pressed 0 V
Other than the above 5 V
15
(R/W) Ground Air bag signal Input Ignition
switch
ONAir bag warning lamp
ON
4 V
Air bag warning lamp
OFF 0 V
18
(W/R) Ground Ambient sensor signal Input — —
19
(V/W) Ground A/C auto amp. connection
recognition signal Input —When A/C auto amp. is
connected
5 V
Other than the above 0 V
20
(B) Ground Ambient sensor ground — Ignition
switch
ON—0 V
21
(L) —CAN-H — — — —
22
(P) —CAN-L — — — —
23
(B) Ground Ground — Ignition
switch
ON
—0 V
24
(V) Ground Fuel level sensor ground — Ignition
switch
ON—0 V
25
(O/L) Ground Alternator signal Input Ignition
switch
ONCharge warning lamp ON 2 V
Charge warning lamp OFF Battery voltage
26
(W) Ground Parking brake switch signal Input Ignition
switch
ONParking brake applied 0 V
Parking brake released 12 V
Te r m i n a l N o .
(Wire color) Description
ConditionVa l u e
(Approx.)
+ – Signal name Input/
Output
JSNIA0014GB
Revision: 2010 May2011 QX56

WCS
POWER SUPPLY AND GROUND CIRCUITWCS-39
< DTC/CIRCUIT DIAGNOSIS >
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DTC/CIRCUIT DIAGNOSIS
POWER SUPPLY AND GROUND CIRCUIT
COMBINATION METER
COMBINATION METER : Diagnosis ProcedureINFOID:0000000006222743
1.CHECK FUSE
Check for blown fuses.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Be sure to eliminate cause of malfunction before installing new fuse.
2.CHECK POWER SUPPLY CIRCUIT
Check voltage between combination meter harness connector and ground.
Is the inspection result normal?
YES >> GO TO 3.
NO >> Check harness between combination meter and fuse.
3.CHECK GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect combination meter connector.
3. Check continuity between combination meter harness connector and ground.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Repair harness or connector.
Power source Fuse No.
Battery 11
Ignition switch ON or START 3
Te r m i n a l s
Ignition switch po-sition Vo l ta g e
(Approx.)
(+) (
−)
Combination meter
Ground
Connector Terminal
M34 1OFF
Battery voltage
2ON
Combination meter
GroundContinuity
Connector Terminal
M34 3
Existed
23
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

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