2004 INFINITI QX56 ignition

TF-98
TRANSFER CONTROL UNIT
Revision: August 20072004 QX56
TRANSFER CONTROL UNITPFP:33084
Removal and InstallationEDS00314
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-14, "
Instrument Lower Cover RH and Glove Box" .
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-28, "SELF-DIAGNOSTIC PROCEDURE"
. If NG, adjust position between transfer assembly and transfer control unit.
BDIA0014E
Transfer control unit bolts : 5.1 N·m (0.52 kg-m, 45 in-lb)

WT-1
ROAD WHEELS & TIRES
E SUSPENSION
CONTENTS
C
D
F
G
H
I
J
K
L
M
SECTION WT
A
B
WT
Revision: August 20072004 QX56 PREPARATION ........................................................... 2
Special Service Tool ................................................. 2
Commercial Service Tools ........................................ 2
NOISE, VIBRATION, AND HARSHNESS (NVH)
TROUBLESHOOTING ................................................ 3
NVH Troubleshooting Chart ..................................... 3
WHEEL ....................................................................... 4
Inspection ................................................................. 4
WHEEL AND TIRE ASSEMBLY ................................. 5
Balancing Wheels .................................................... 5
REMOVAL ............................................................. 5
WHEEL BALANCE ADJUSTMENT ...................... 5
Rotation .................................................................... 6
LOW TIRE PRESSURE WARNING SYSTEM ............ 7
System Components ................................................ 7
System Description .................................................. 7
TRANSMITTER ..................................................... 7
REMOTE KEYLESS ENTRY RECEIVER ............. 7
BCM (BODY CONTROL MODULE) ...................... 8
LOW TIRE PRESSURE WARNING LAMP AND
BUZZER ................................................................ 8
DISPLAY UNIT ...................................................... 8
CAN COMMUNICATION ............................................ 9
System Description .................................................. 9
TROUBLE DIAGNOSES .......................................... 10
Wiring Diagram — T/WARN — .............................. 10
Terminal and Reference Value (BCM) .................... 12
ID Registration Procedure ...................................... 13
ID REGISTRATION WITH TRANSMITTER
ACTIVATION TOOL ............................................ 13
ID REGISTRATION WITHOUT TRANSMITTER
ACTIVATION TOOL ............................................ 14
Transmitter Wake Up Operation ............................. 15
............................................................................ 15
CONSULT-II Function (BCM) ................................. 16
Self-Diagnosis ........................................................ 17
DESCRIPTION .................................................... 17
FUNCTION .......................................................... 17CONSULT-II ......................................................... 17
How to Perform Trouble Diagnosis for Quick and
Accurate Repair ...................................................... 19
INTRODUCTION ................................................. 19
WORK FLOW ...................................................... 19
Preliminary Check .................................................. 20
Malfunction Code/Symptom Chart .......................... 21
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC
ITEMS ........................................................................ 23
Inspection 1: Transmitter or Control Unit (BCM) ..... 23
MALFUNCTION CODE NO. 21, 22, 23 OR 24 ... 23
Inspection 2: Transmitter - 1 ................................... 23
MALFUNCTION CODE NO. 31, 32, 33, 34, 41,
42, 43, 44, 45, 46, 47 OR 48 ............................... 23
Inspection 3: Transmitter - 2 ................................... 24
MALFUNCTION CODE NO. 35, 36, 37 OR 38 ... 24
Inspection 4: Vehicle Speed Signal ........................ 25
MALFUNCTION CODE NO. 52 ........................... 25
TROUBLE DIAGNOSIS FOR SYMPTOMS .............. 26
Inspection 1: Low Tire Pressure Warning Lamp
Does Not Come On When Ignition Switch Is Turned
On ........................................................................... 26
Inspection 2: Low Tire Pressure Warning Lamp
Stays On When Ignition Switch Is Turned On ......... 26
Inspection 3: Low Tire Pressure Warning Lamp
Flashes When Ignition Switch Is Turned On .......... 28
Inspection 4: Hazard Warning Lamp Flashes When
Ignition Switch Is Turned On .................................. 29
Inspection 5: “TIRE PRESSURE” Information In
Display Unit Does Not Exist .................................... 30
Inspection 6: ID Registration Cannot Be Completed ... 30
REMOVAL AND INSTALLATION ............................. 31
Transmitter (Pressure Sensor) ............................... 31
REMOVAL ........................................................... 31
INSTALLATION ................................................... 31
SERVICE DATA AND SPECIFICATIONS (SDS) ...... 33
Road Wheel ............................................................ 33
Tire ......................................................................... 33

WT-8
LOW TIRE PRESSURE WARNING SYSTEM
Revision: August 20072004 QX56
BCM (BODY CONTROL MODULE)
Reads the air pressure signal received by the remote keyless entry
receiver, and controls the low tire pressure warning lamp and the
buzzer operations as shown below. It also has a judgement function
to detect a system malfunction.
LOW TIRE PRESSURE WARNING LAMP AND BUZZER
Indicates low tire pressure or system malfunction.
DISPLAY UNIT
Displays the air pressure of each tire.

After the ignition switch is turned on, the pressure values are not
be displayed until the data of each wheel is received.
LEIA0068E
ConditionLow tire pressure
warning lampBuzzer
Less than 193 kPa (2.0 kg/cm
2 , 28 psi)
[Flat tire]ONSounds for
10 sec.
System malfunction ON OFF
LEIA0055E
WEIA0082E

WT-12
TROUBLE DIAGNOSES
Revision: August 20072004 QX56
Terminal and Reference Value (BCM)EES0012A
() : Wire colorTerminal
Item ConditionVoltage (V)
(Approx.)
+–
15 (L/W)
GroundTire pressure warning check
connector—5V
18 (P)Remote keyless entry receiver
(Ground)—0V
19 (V/W)Remote keyless entry receiver
(Power supply)Ignition switch OFF
20 (G/W)Remote keyless entry receiver
signal (Signal)Stand-by (keyfob buttons
released)
When remote keyless entry
receiver receives signal from
keyfob (keyfob buttons
pressed)
38 (W/L) Ignition switch Ignition switch ON or START Battery voltage
39 (W) Data line (CAN-H) — —
40 (R) Data line (CAN-L) — —
67 (B) GND — 0V
70 (W/B) Battery power supply — Battery voltage
LIIA1893E
LIIA1894E
LIIA1895E

TROUBLE DIAGNOSES
WT-13
C
D
F
G
H
I
J
K
L
MA
B
WT
Revision: August 20072004 QX56
ID Registration ProcedureEES0012B
ID REGISTRATION WITH TRANSMITTER ACTIVATION TOOL
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.
CAUTION:
If CONSULT-II is used with no connection of CONSULT-II CONVERTER, malfunction might be detected
during self-diagnosis depending on control unit which carries out CAN communication.
1. With the ignition switch OFF, connect CONSULT-II and CONSULT-II CONVERTER to the data link con-
nector, then turn the ignition switch ON.
2. Select "START (NISSAN BASED VHCL)".
3. Touch “BCM” on "SELECT SYSTEM" screen.
NOTE:
If "BCM" is not indicated, go to LAN-5, "
CAN COMMUNICATION" .
4. Select “AIR PRESSURE MONITOR” on "SELECT TEST ITEM" screen.
5. Select “WORK SUPPORT” on "SELECT DIAG MODE" screen, and select "ID REGIST".
6. With the transmitter activation tool (J-45295) pushed against the
front left transmitter position of the tire air valve, press the button
for 5 seconds.
7. Register the IDs in order from FR LH, FR RH, RR RH and RR LH. When ID registration of each wheel has
been completed, a buzzer sounds and the warning lamp flashes.
8. After completing all ID registrations, press “END” to complete the procedure.
NOTE:
Be sure to register the IDs in order from FR LH, FR RH, RR RH, to RR LH, or the self-diagnostic results dis-
play will not function properly.Tool number — (J-45295)
LEIA0036E
Activation tire position Buzzer Hazard warning lamp CONSULT-II
1Front LH Once
2 times flashing“YET”
↓
“DONE” 2 Front RH 2 times
3 Rear RH 3 times
4 Rear LH 4 times

WT-14
TROUBLE DIAGNOSES
Revision: August 20072004 QX56
ID REGISTRATION WITHOUT TRANSMITTER ACTIVATION TOOL
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. With the ignition switch OFF, connect CONSULT-II and CONSULT-II CONVERTER to the data link con-
nector, then turn the ignition switch ON.
2. Select "START (NISSAN BASED VHCL)".
3. Touch “BCM” on "SELECT SYSTEM" screen.
NOTE:
If "BCM" is not indicated, go to LAN-5, "
CAN COMMUNICATION" .
4. Select “AIR PRESSURE MONITOR” on “SELECT TEST ITEM" screen.
5. Select “WORK SUPPORT” on “SELECT DIAG MODE" screen, and select "ID REGIST".
6. Adjust the tire pressure to the values shown in the table below for ID registration, and drive the vehicle at
15 km/h (9.4 MPH) or more for a few minutes.
7. After completing all ID registrations, press “END” to complete the procedure.
8. Inflate all tires to proper pressure. Refer to WT-33, "
Tire" .
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

TROUBLE DIAGNOSES
WT-15
C
D
F
G
H
I
J
K
L
MA
B
WT
Revision: August 20072004 QX56
Transmitter Wake Up OperationEES0012C
1. With the transmitter activation tool (J-45295) pushed against the
front left transmitter, press the button for 5 seconds.

With ignition switch ON, as the low tire pressure warning lamp
flashes per the follow diagram, the respective transmitter then
must be woken up.
2. When the BCM finishes assigning each tire ID, the BCM flashes the hazard warning lamps and trailer
flasher lamps and sends flashing indicator status by CAN according to the following time chart.
3. After completing wake up of all transmitters, make sure low tire pressure warning lamp goes out.Tool number — (J-45295)
LEIA0036E
LEIA0059E

WT-18
TROUBLE DIAGNOSES
Revision: August 20072004 QX56
Data Monitor Mode
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.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.
ID REGST FL1
ID REGST FR1
ID REGST RR1
ID REGST RL1
Ignition switch ONRegistration ID: DONE
No registration ID: YET
WAR NIN G 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