ignition INFINITI QX56 2007 Factory Service Manual

TRANSFER CONTROL UNIT
TF-115
< SERVICE INFORMATION >
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TRANSFER CONTROL UNIT
Removal and InstallationINFOID:0000000003532562
REMOVAL
1. Set transfer state as 2WD when 4WD shift switch is at 2WD, or as AUTO when 4WD shift switch is at
AUTO.
CAUTION:
When removing transfer control unit, transfer state must be at 2WD or AUTO.
2. Turn the ignition switch OFF and disconnect negative battery terminal.
3. Remove the glove box assembly. Refer to IP-10, "
Removal and Installation".
4. Disconnect the two transfer control unit connectors.
5. Remove the transfer control unit bolts.
6. Remove the transfer control unit.
INSTALLATION
Installation is in the reverse order of removal.
• When installing the transfer control unit, tighten bolts to the specified torque.
CAUTION:
• Do not connect harness connector to transfer control unit when 4WD shift switch is at 4LO.
• After the installation, check perform self-diagnosis. Refer to TF-48, "
Self-Diagnosis Procedure". If NG, adjust
position between transfer assembly and transfer control unit. Refer to TF-3, "
Precaution for Transfer Assem-
bly and Transfer Control Unit Replacement".
BDIA0014E
Transfer control unit bolts : 5.1 N·m (0.52 kg-m, 45 in-lb)

WT-1
SUSPENSION
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SECTION WT
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PCONTENTS
ROAD WHEELS & TIRES
SERVICE INFORMATION ............................2
PRECAUTIONS ...................................................2
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ...................................................................
2
PREPARATION ...................................................3
Special Service Tool .................................................3
Commercial Service Tool ..........................................3
NOISE, VIBRATION AND HARSHNESS
(NVH) TROUBLESHOOTING .............................
4
NVH Troubleshooting Chart ......................................4
WHEEL ................................................................5
Inspection ..................................................................5
WHEEL AND TIRE ASSEMBLY .........................6
Balancing Wheels .....................................................6
Rotation .....................................................................7
LOW TIRE PRESSURE WARNING SYSTEM .....8
System Component ...................................................8
System Description ...................................................8
CAN COMMUNICATION ....................................10
System Description .................................................10
TROUBLE DIAGNOSIS .....................................11
Wiring Diagram- T/WARN - .....................................11
Terminal and Reference Value (BCM) ....................12
ID Registration Procedure .......................................12
Transmitter Wake Up Operation .............................14
CONSULT-II Function (BCM) ..................................15
Self-Diagnosis .........................................................15
How to Perform Trouble Diagnosis for Quick and
Accurate Repair .......................................................
17
Preliminary Check ...................................................18
Flash Code/Symptom Chart ....................................18
TROUBLE DIAGNOSIS FOR SELF-DIAG-
NOSTIC ITEMS .................................................
20
Data from Transmitter Not Being Received .............20
Transmitter Malfunction ...........................................20
Transmitter Pressure Malfunction ............................21
Vehicle Speed Signal ..............................................21
Ignition Signal ..........................................................22
TROUBLE DIAGNOSIS FOR SYMPTOMS ......23
Low Tire Pressure Warning Lamp Does Not Come
On When Ignition Switch Is Turned On ...................
23
Low Tire Pressure Warning Lamp Stays On When
Ignition Switch Is Turned On ...................................
23
Low Tire Pressure Warning Lamp Flashes When
Ignition Switch Is Turned On ...................................
24
Hazard Warning Lamps Flash When Ignition
Switch Is Turned On ................................................
25
"TIRE PRESSURE" Information in Display Unit
Does Not Exist .........................................................
25
ID Registration Cannot Be Completed ....................25
REMOVAL AND INSTALLATION .....................26
Transmitter (Pressure Sensor) ................................26
SERVICE DATA AND SPECIFICATIONS
(SDS) .................................................................
28
Road Wheel .............................................................28
Tire ..........................................................................28

WT-8
< SERVICE INFORMATION >
LOW TIRE PRESSURE WARNING SYSTEM
LOW TIRE PRESSURE WARNING SYSTEM
System ComponentINFOID:0000000003532692
System DescriptionINFOID:0000000003532693
BODY CONTROL MODULE (BCM)
The BCM is shown with the lower instrument panel LH removed. The
BCM reads the air pressure signal received by the remote keyless
entry receiver, and controls the low tire pressure warning lamp as
shown below. It also has a self-diagnosis function to detect a system
malfunction.
TRANSMITTER
A sensor-transmitter integrated with a valve is installed in each
wheel, and transmits a detected air pressure signal in the form of a
radio wave. The radio signal is received by the remote keyless entry
receiver.
WEIA0081E
Condition Low tire pressure warning lamp
System normal On for 1 second after ignition ON
Tire less than 193 kPa (2.0 kg/cm
2 , 28 psi)
[Flat tire]ON
Low tire pressure warning system malfunc-
tionAfter key ON, flashes once per sec-
ond for 1 minute, then stays ON
LEIA0068E
WEIA0137E

LOW TIRE PRESSURE WARNING SYSTEM
WT-9
< SERVICE INFORMATION >
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REMOTE KEYLESS ENTRY RECEIVER
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.
DISPLAY UNIT
Displays the air pressure of each tire.
• After the ignition switch is turned on, the pressure values will not
be displayed until the data of each wheel is received.
LEIA0069E
LEIA0055E
LEIA0067E

WT-14
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
3. Select “WORK SUPPORT” on “SELECT DIAG MODE" screen,
and select "ID REGIST".
4. Adjust the tire pressure to the values shown in the table below
and drive the vehicle at 15 km/h (9.4 MPH) or more for a few
minutes.
5. After completing all ID registrations, press “END” to complete the procedure.
6. Inflate all tires to proper pressure. Refer to WT-28, "
Tire".
Transmitter Wake Up OperationINFOID:0000000003532698
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 diagram
below.
2. Repeat this procedure for each tire in the following order: FL, FR, RR, RL.
BCIA0031E
Tire position
Tire pressure kPa (kg/cm2, psi)
Front – Left 250 (2.5, 36)
Front – Right 230 (2.3, 33)
Rear – Right 210 (2.1, 30)
Rear – Left 190 (1.9, 27)
Activation tire position CONSULT-II
Front LH
“YET”
↓
“DONE” Front RH
Rear RH
Rear LH
Tool number : (J-45295)
LEIA0036E

WT-16
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
× : Applicable
– : Not applicable
Self-Diagnostic Results Mode
NOTE:
Before performing the self-diagnosis, be sure to register the ID or else the actual malfunction location may be different from that dis-
played on CONSULT-II.
Data Monitor Mode
Rear - Left transmitter××
Rear - Right transmitter××
Warning lamp —×
Vehicle speed××
Buzzer (in combination meter) —×
CAN Communication×× ITEM SELF-DIAGNOSTIC RESULTS DATA MONITOR
Diagnostic item
Diagnostic item is detected when ···Reference
page Program card UED06A or
earlierProgram card UED06B or later
FLAT - TIRE - FL [C1704]
FLAT - TIRE - FR [C1705]
FLAT - TIRE - RR [C1706]
FLAT - TIRE - RL [C1707]LOW - PRESSURE - FL [C1704]
LOW - PRESSURE - FR [C1705]
LOW - PRESSURE - RR [C1706]
LOW - PRESSURE - RL [C1707]FL tire pressure 193 kPa (2.0 kg/cm
2 , 28 psi) or less
FR tire pressure 193 kPa (2.0 kg/cm2 , 28 psi) or less
RR tire pressure 193 kPa (2.0 kg/cm2 , 28 psi) or less
RL tire pressure 193 kPa (2.0 kg/cm2 , 28 psi) or less—
[NO-DATA] - FL [C1708]
[NO-DATA] - FR [C1709]
[NO-DATA] - RR [C1710]
[NO-DATA] - RL [C1711]Data from FL transmitter cannot be received.
Data from FR transmitter cannot be received.
Data from RR transmitter cannot be received.
Data from RL transmitter cannot be received.WT-20
[CHECKSUM- ERR] - FL [C1712]
[CHECKSUM- ERR] - FR [C1713]
[CHECKSUM- ERR] - RR [C1714]
[CHECKSUM- ERR] - RL [C1715]Checksum data from FL transmitter is malfunctioning.
Checksum data from FR transmitter is malfunctioning.
Checksum data from RR transmitter is malfunctioning.
Checksum data from RL transmitter is malfunctioning.WT-20
[PRESSDATA- ERR] - FL [C1716]
[PRESSDATA- ERR] - FR [C1717]
[PRESSDATA- ERR] - RR [C1718]
[PRESSDATA- ERR] - RL [C1719]Air pressure data from FL transmitter is malfunctioning.
Air pressure data from FR transmitter is malfunctioning.
Air pressure data from RR transmitter is malfunctioning.
Air pressure data from RL transmitter is malfunctioning.WT-21
[CODE- ERR] - FL [C1720]
[CODE- ERR] - FR [C1721]
[CODE- ERR] - RR [C1722]
[CODE- ERR] - RL [C1723]Function code data from FL transmitter is malfunctioning.
Function code data from FR transmitter is malfunctioning.
Function code data from RR transmitter is malfunctioning.
Function code data from RL transmitter is malfunctioning.WT-20
[BATT - VOLT - LOW] - FL [C1724]
[BATT - VOLT - LOW] - FR [C1725]
[BATT - VOLT - LOW] - RR [C1726]
[BATT - VOLT - LOW] - RL [C1727]Battery voltage of FL transmitter drops.
Battery voltage of FR transmitter drops.
Battery voltage of RR transmitter drops.
Battery voltage of RL transmitter drops.WT-20
VHCL_SPEED_SIG_ERR [C1729] Vehicle speed signal is in error.WT-21
IGN_CIRCUIT_OPEN [C1735] Vehicle ignition signal is in error.WT-22
MONITOR CONDITION SPECIFICATION
VHCL SPEED Drive vehicle. Vehicle speed (km/h or MPH)
AIR PRESS FL
AIR PRESS FR
AIR PRESS RR
AIR PRESS RL• Drive vehicle for a few minutes.
Tire pressure (kPa or psi) or
• Ignition switch ON and activation tool
is transmitting activation signals.

TROUBLE DIAGNOSIS
WT-17
< SERVICE INFORMATION >
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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-II.
How to Perform Trouble Diagnosis for Quick and Accurate RepairINFOID:0000000003532701
INTRODUCTION
• Before troubleshooting, verify customer complaints.
• If a vehicle malfunction is difficult to reproduce, harnesses, harness connectors or terminals may be mal-
functioning. Hold and shake these parts to make sure they are securely connected.
• When using a circuit tester to measure voltage or resistance of each circuit, be careful not to damage or
deform connector terminals.
WORK FLOW
ID REGST FL1
ID REGST FR1
ID REGST RR1
ID REGST RL1
Ignition switch ONRegistration ID: DONE
No registration ID: YET
WARNING LAMPLow tire pressure warning lamp on: ON
Low tire pressure warning lamp off: OFF
BUZZERBuzzer in combination meter on: ON
Buzzer in combination meter off: OFF MONITOR CONDITION SPECIFICATION
SEIA0100E

WT-18
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
Preliminary Check
INFOID:0000000003532702
BASIC INSPECTION
1.CHECK ALL TIRE PRESSURES
Check all tire pressures. Refer to WT-28, "
Tire".
OK or NG
OK >> GO TO 2.
NG >> Adjust tire pressure to specified value.
2.CHECK LOW TIRE PRESSURE WARNING LAMP ACTIVATION
Check low tire pressure warning lamp activation.
Does warning lamp activate for 1 second when ignition switch is turned ON?
YES >> GO TO 3.
NO >> GO TO WT-23, "
Low Tire Pressure Warning Lamp Does Not Come On When Ignition Switch Is
Turned On".
3.CHECK BCM CONNECTOR
1. Disconnect BCM harness connector.
2. Check terminals for damage or loose connection.
3. Reconnect harness connector.
OK or NG
OK >> GO TO 4.
NG >> Repair or replace damaged parts.
4.CHECK TRANSMITTER ACTIVATION TOOL
Check transmitter activation tool battery.
OK or NG
OK >> Carry out self-diagnosis.
NG >> Replace battery in transmitter activation tool.
Flash Code/Symptom ChartINFOID:0000000003532703
Preliminary check:WT-18Self-diagnosis:WT-15Trouble diagnosis for symptoms:WT-23
Flash Code or Symptom Malfunction partReference
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18FL tire pressure drops to 193 kPa (2.0 kg/cm
2, 28 psi) or less
FR tire pressure drops to 193 kPa (2.0 kg/cm2, 28 psi) or less
RR tire pressure drops to 193 kPa (2.0 kg/cm2, 28 psi) or less
RL tire pressure drops to 193 kPa (2.0 kg/cm2, 28 psi) or less—
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24Transmitter no data (FL)
Transmitter no data (FR)
Transmitter no data (RR)
Transmitter no data (RL)WT-20
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34Transmitter checksum error (FL)
Transmitter checksum error (FR)
Transmitter checksum error (RR)
Transmitter checksum error (RL)WT-20
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38Transmitter pressure data error (FL)
Transmitter pressure data error (FR)
Transmitter pressure data error (RR)
Transmitter pressure data error (RL)WT-21

TROUBLE DIAGNOSIS
WT-19
< SERVICE INFORMATION >
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44Transmitter function code error (FL)
Transmitter function code error (FR)
Transmitter function code error (RR)
Transmitter function code error (RL)WT-20
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48Transmitter battery voltage low (FL)
Transmitter battery voltage low (FR)
Transmitter battery voltage low (RR)
Transmitter battery voltage low (RL)WT-20
52 Vehicle speed signalWT-21
54 Vehicle ignition signalWT-22
Low tire pressure warning lamp does
not come on when ignition switch is
turned on.• Fuse or combination meter
• BCM connector or circuit
•BCM WT-23
Low tire pressure warning lamp stays
on when ignition switch is turned on.• Combination meter
• BCM connector or circuit
•BCMWT-23
Low tire pressure warning lamp flashes
when ignition switch is turned on.• BCM harness connector or circuit
•BCM
• Transmitter's mode off
• ID registration not completed yetWT-24
Hazard warning lamps flash when igni-
tion switch is turned on.• BCM harness connector or circuit
•BCMWT-25
ID registration cannot be completed.• Transmitter
• Remote keyless entry receiver harness connector or circuit
• Remote keyless entry receiver
• BCM harness connector or circuit
•BCMWT-25
Flash Code or Symptom Malfunction partReference
page

WT-22
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
Ignition Signal
INFOID:0000000003585170
MALFUNCTION CODE NO. 54 (DTC C1735)
1.CAN IGNITION SIGNAL
Check BCM IGN RLY signal with CONSULT-II.
Are the inspection results normal with the ignition switch ON?
YES >> GO TO 2.
NO >> Check CAN system.
2.BCM POWER SUPPLY
Check BCM power supply (ignition ON). Refer to BCS-15, "
BCM Power Supply and Ground Circuit Inspec-
tion".
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-24, "
BCM".