2010 INFINITI QX56 Ignition switch

WCS
PRECAUTIONSWCS-69
< PRECAUTION >
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PRECAUTION
PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000005238466
The Supplemental Restraint System such as “AIR 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 w hether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SR and SB section of this Service Man-
ual.
WARNING:
• To avoid rendering the SRS inoper ative, which could increase the risk of personal injury or death in
the event of a collision which would result in air bag 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 SR section.
• 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 Airbag Diagnosis Sensor Un it or other Airbag System sensors with the Igni-
tion ON or engine running, DO NOT use air or el ectric 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.
Necessary for Steering Wheel Ro tation After Battery DisconnectINFOID:0000000005238467
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.
This vehicle is equipped with a push-button ignition switch and a steering lock unit.
If the battery is disconnect ed or discharged, the steering wheel will lock and cannot be turned.
If turning the steering wheel is required with the battery disconnected or discharged, follow the procedure
below before starting the repair operation.
OPERATION PROCEDURE
1. Connect both battery cables. NOTE:
Supply power using jumper cables if battery is discharged.
2. Carry the Intelligent Key or insert it to the key slot and 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 will remain released with both battery cables discon- nected and the steering wheel can be turned.
4. Perform the necessary repair operation.
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 ignition switch is turned to LOCK position.)
Revision: April 20092010 QX56

WT-1
SUSPENSION
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SECTION WT
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O PCONTENTS
ROAD WHEELS & TIRES
BASIC INSPECTION ....... .............................3
DIAGNOSIS AND REPAIR WORKFLOW ..... .....3
Repair Work Flow ................................................ ......3
INSPECTION AND ADJUSTMENT .....................5
Preliminary Check ............................................... ......5
Transmitter Wake Up Operation ...............................5
ID Registration Procedure .........................................6
FUNCTION DIAGNOSIS ...............................8
TPMS .............................................................. .....8
System Diagram .................................................. ......8
System Description ...................................................8
System Component .................................................10
DIAGNOSIS SYSTEM (BCM) ............................11
CONSULT-III Function (BCM) ............................. ....11
Self-Diagnosis (Without CONSULT-III) ...................12
COMPONENT DIAGNOSIS .........................14
C1708 - C1711 DATA FROM TRANSMITTER
NOT BEING RECEIVED ................................. ....
14
Description .......................................................... ....14
DTC Logic ...............................................................14
Diagnosis Procedure ...............................................14
Special Repair Requirement ...................................15
C1712 - C1715, C1720 - C1723, C1724 -
C1727 TRANSMITTER MALFUNCTION ....... ....
16
Description .......................................................... ....16
DTC Logic ...............................................................16
Diagnosis Procedure ...............................................16
Special Repair Requirement ...................................17
C1716 - C1719 TRANSMITTER PRESSURE
MALFUNCTION .............................................. ....
18
Description .......................................................... ....18
DTC Logic ...............................................................18
Diagnosis Procedure ...............................................18
Special Repair Requirement ................................ ....18
C1729 VEHICLE SPEED SIGNAL ....................19
Description ...............................................................19
DTC Logic ................................................................19
Diagnosis Procedure ...............................................19
Special Repair Requirement ....................................19
C1735 IGNITION SIGNAL .................................20
Description ...............................................................20
DTC Logic ................................................................20
Diagnosis Procedure ...............................................20
Special Repair Requirement ....................................20
ECU DIAGNOSIS .........................................21
BCM (BODY CONTROL MODULE) .................21
Reference Value .................................................. ....21
Terminal Layout .......................................................24
Physical Values ................................................... ....24
Wiring Diagram - TIRE PRESSURE MONITOR-
ING SYSTEM - ........................................................
30
Self-Diagnosis (With CONSULT-III) .................... ....33
Self-Diagnosis (Without CONSULT-III) ...................34
SYMPTOM DIAGNOSIS ..............................36
TPMS .................................................................36
Symptom Table ................................................... ....36
LOW TIRE PRESSURE WARNING LAMP
DOES NOT TURN ON .......................................
37
Low Tire Pressure Warning Lamp Does Not Come
On When Ignition Switch Is Turned On ...................
37
LOW TIRE PRESSURE WARNING LAMP
STAYS ON ........................................................
38
Low Tire Pressure Warning Lamp Stays On When
Ignition Switch Is Turned On ............................... ....
38
LOW TIRE PRESSURE WARNING LAMP
BLINKS .............................................................
39
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WT-2
Low Tire Pressure Warning Lamp Flashes When
Ignition Switch Is Turned On ..................................
39
HAZARD WARNING LAMPS FLASH ...............40
Hazard Warning Lamps Flash When Ignition
Switch Is Turned On ............................................ ...
40
"TIRE PRESSURE" INFORMATION IN DIS-
PLAY UNIT DOES NOT EXIST .........................
41
"TIRE PRESSURE" Information in Display Unit
Does Not Exist ..................................................... ...
41
ID REGISTRATION CANNOT BE COMPLET-
ED ......................................................................
42
ID Registration Cannot Be Completed ................ ...42
NOISE, VIBRATION AND HARSHNESS
(NVH) TROUBLESHOOTING ......................... ...
43
NVH Troubleshooting Chart ................................ ...43
PRECAUTION .............................................44
PRECAUTIONS .............................................. ...44
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" .............................................................. ...
44
Precaution Necessary for Steering Wheel Rota-
tion After Battery Disconnect ..................................
44
PREPARATION ..........................................46
PREPARATION .............................................. ...46
Special Service Tool ............................................ ...46
Commercial Service Tool ........................................46
ON-VEHICLE MAINTENANCE ..................47
WHEEL ........................................................... ...47
Inspection ............................................................. ...47
ON-VEHICLE REPAIR ...............................48
WHEEL AND TIRE ASSEMBLY .................... ...48
Balancing Wheels ................................................ ...48
Rotation ...................................................................49
REMOVAL AND INSTALLATION ..............50
REMOVAL AND INSTALLATION .................. ...50
Transmitter (Pressure Sensor) ............................. ...50
SERVICE DATA AND SPECIFICATIONS
(SDS) .......... ................................. ...............
52
SERVICE DATA AND SPECIFICATIONS
(SDS) .............................................................. ...
52
Road Wheel ......................................................... ...52
Tire ..........................................................................52
Revision: April 20092010 QX56

INSPECTION AND ADJUSTMENTWT-5
< BASIC INSPECTION >
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INSPECTION AND ADJUSTMENT
Preliminary CheckINFOID:0000000005148203
1.TIRE PRESSURE
Check all tire pressures. Refer to WT-52, "
Tire".
Do tire pressures match specification?
YES >> GO TO 2.
NO >> Adjust tire pressures to specified value.
2.LOW TIRE PRESSURE WARNING LAMP
Check low tire pressure warning lamp activation.
Does the low tire pressure warning lamp activate for one second when ignition switch is turned ON?
YES >> GO TO 3.
NO >> GO TO WT-37, "
Low Tire Pressure Warning Lamp Does Not Come On When Ignition Switch Is
Turned On".
3.BCM CONNECTOR
1. Disconnect BCM harness connectors.
2. Check terminals for damage or loose connections.
3. Reconnect harness connectors.
Are BCM connectors damaged or loose?
YES >> Repair or replace damaged parts.
NO >> GO TO 4.
4.TRANSMITTER ACTIVATION TOOL
Check battery in transmitter activation tool.
Is transmitter activation tool battery fully charged?
YES >> Perform self-diagnosis. Refer to WT-33, "Self-Diagnosis (With CONSULT-III)".
NO >> Replace battery in transmitter activation tool.
Transmitter Wake Up OperationINFOID:0000000005148204
NOTE:
This procedure must be done after replacement of a low tire pressure warning transmitter or BCM.
New replacement transmitters are provided "asleep" and must first be "woken up" using Transmitter
Activation Tool J-45295 before ID registration can be performed.
1. Turn ignition switch ON. Push the transmitter activation tool against the tire near the front left transmitter. Press the button for
5 seconds. The hazard warning lamps flash per the following
diagram.
2. Repeat this procedure for each tire in the following order: FL, FR, RR, RL. Tool number : (J-45295)
LEIA0036E
Revision: April 20092010 QX56

TPMSWT-9
< FUNCTION DIAGNOSIS >
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The remote keyless entry receiver is shown with the instrument
panel RH removed. The remote keyless entry receiver receives the
air pressure signal transmitted by the transmitter in each wheel.
COMBINATION METER
The combination meter receives tire pressure status from the BCM
using CAN communication. When a low tire pressure condition is
sensed by the BCM, the combination meter low tire pressure warn-
ing lamp is activated.
TIRE PRESSURE WARNING CHECK CONNECTOR
The tire pressure warning check connector can be grounded in order
to initiate self-diagnosis without a CONSULT-III. Refer to WT-34,
"Self-Diagnosis (Without CONSULT-III)". The tire pressure warning
check connector is located behind the lower portion of the instrument
panel LH.
DISPLAY UNIT
Displays the air pressure of each tire.
NOTE:
After the ignition switch is turned on, the pressure values will not be
displayed until the data of each wheel is received.
LEIA0069E
LEIA0055E
LEIA0068E
AWEIA0017GB
Revision: April 20092010 QX56

DIAGNOSIS SYSTEM (BCM)WT-11
< FUNCTION DIAGNOSIS >
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DIAGNOSIS SYSTEM (BCM)
CONSULT-III Function (BCM)INFOID:0000000005148209
CONSULT-III DIAGNOSTIC MODES
CONSULT-III can display each diagnostic item using the diagnostic test modes shown following.
DESCRIPTION
During driving, the tire pressure monitoring system receives the signal transmitted from the transmitter
installed in each wheel, and turns on the low tire pressure warning lamp when the tire pressure becomes low.
The control unit (BCM) for this system has pr essure judgement and self-diagnosis functions.
FUNCTION
When the tire pressure monitoring system detects low infl ation pressure or an internal malfunction, the low tire
pressure warning lamp in the combination meter comes on. The malfunction is indicated by the low tire pres-
sure warning lamp flashing.
CONSULT-III Application to Ti re Pressure Monitoring System
× : Applicable
– : Not applicable
Data Monitor Mode
Diagnostic mode Description
Work Support Supports inspections and adjustments. Commands are transmitted to the BCM
for setting the status suitable for required operation, input/output signals are re-
ceived from the BCM and received data is displayed.
Data Monitor Displays BCM input/output data in real time.
Active Test Operation of electrical loads can be checked by sending drive signal to them.
Self Diagnostic Result Displays BCM self-diagnosis results.
CAN Diag Support Monitor The result of transmit/receive diagnosis of CAN communication can be read.
ECU Identification BCM part number can be read.
Configuration Performs BCM configuration read/write functions.
ITEMSELF-DIAGNOSTIC RESULTS DATA MONITOR
Front - Left transmitter ××
Front - Right transmitter ××
Rear - Left transmitter ××
Rear - Right transmitter ××
Warning lamp —×
Vehicle speed ××
CAN Communication ××
MONITORCONDITION SPECIFICATION
VEHICLE SPEED Drive vehicle. Vehicle speed (km/h or MPH)
AIR PRESS FL • Drive vehicle for a few minutes.
or
• Ignition switch ON and activation tool
is transmitting activation signals. Tire pressure (kPa or psi)
AIR PRESS FR
AIR PRESS RR
AIR PRESS RL
ID REGST FL1
Ignition switch ON ID not registered: YET
ID registered: DONE
ID REGST FR1
ID REGST RR1
ID REGST RL1
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WT-12
< FUNCTION DIAGNOSIS >
DIAGNOSIS SYSTEM (BCM)
NOTE:
Before performing the self-diagnosis, be sure to register the ID, or the actual malfunction location may be different from that displayed on
CONSULT-III.
Active Test
Work Support
Self-Diagnosis (Without CONSULT-III)INFOID:0000000005315450
SELF DIAGNOSTIC PROCEDURE (WITHOUT CONSULT-III)
1. Turn ignition switch ON.
2. Ground the tire pressure warning check connector to initiate self diagnosis.
3. Compare the flashing pattern with the flash code chart below.
NOTE:
The system is normal when the low tire pressure warni ng lamp flashes 5 times and continues repeating. Self-
diagnosis results are erased automatically by turning the ignition switch “OFF”.
WARNING LAMPIgnition switch ON Low tire pressure warning lamp on: On
Low tire pressure wa
rning lamp off: Off
BUZZER Ignition switch ON Low tire pressure buzzer on: On
Low tire pressure buzzer off: Off
MONITOR
CONDITION SPECIFICATION
Test item Content
WARNING LAMP [On/Off] Activates the low tire pressure warning lamp (On/Off).
ID REGIST WARNING [On/Off] Activates the low tire pressure warning buzzer (On/Off).
FLAT TIRE WARNING [On/Off] Activates the lo w tire pressure warning buzzer (On/Off).
Test item Content
ID REGIST The identification number of the transmitter is registered in the BCM.
ID READ The identification registration number of the transmitter is read by the BCM.
Flash Code Malfunction partReference
page
15
16
17
18 Tire pressure dropped below specified value. Refer to
WT-8, "
System
Description". —
21
22
23
24 Transmitter no data (FL)
Transmitter no data (FR)
Transmitter no data (RR)
Transmitter no data (RL)
WT-14
31
32
33
34Transmitter chec
ksum error (FL)
Transmitter chec ksum error (FR)
Transmitter chec ksum error (RR)
Transmitter chec ksum error (RL) WT-16
ALEIA0050GB
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WT-20
< COMPONENT DIAGNOSIS >
C1735 IGNITION SIGNAL
C1735 IGNITION SIGNAL
DescriptionINFOID:0000000005148227
The BCM monitors the IGN ON signal on the CAN line and compares it to it’s direct IGN ON signal. When
these two signals do not match, the BCM sets C1735.
DTC LogicINFOID:0000000005148228
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.CHECK SELF-DIAGNOSTIC RESULTS
1. On SELECT DIAG MODE, select the SELF-DIAG RESULT screen.
2. Check display contents on SELF DIAG RESULT screen.
Is C1735 displayed in the self-diagnosis display?
YES >> Refer to WT-20, "Diagnosis Procedure".
NO >> Inspection End.
Diagnosis ProcedureINFOID:0000000005148229
MALFUNCTION CODE NO. 54 (DTC C1735)
1.CAN IGNITION SIGNAL
Check BCM IGN RLY signal with CONSULT-III. Refer to BCS-40, "
Reference Value".
Are the inspection results normal with the ignition switch ON?
YES >> GO TO 2.
NO >> Check CAN system. Refer to LAN-44, "
CAN System Specification Chart".
2.BCM POWER SUPPLY
Check BCM power supply (ignition ON). Refer to BCS-33, "
Diagnosis Procedure".
Is the power supply with the ignition switch ON normal?
YES >> GO TO 3.
NO >> Repair power supply as necessary.
3.DRIVE VEHICLE
Clear DTC and then test drive the vehicle and check the low tire pressure warning lamp.
Does the vehicle operate without any low tire pressure warning lamp?
YES >> Inspection End.
NO >> Replace BCM. Refer to BCS-59, "
Removal and Installation".
Special Repair RequirementINFOID:0000000005315449
Perform preliminary check. Refer to WT-5, "Preliminary Check".
DTCCONSULT - III DTC detecting condition
C1735 IGNITION SIGNAL LINE - BCM/TPMS BCM has detected a mismatch between IGN ON signals.
Revision: April 20092010 QX56