INFINITI QX56 2004 Factory Service Manual

WT-22
TROUBLE DIAGNOSES
Revision: August 20072004 QX56
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 yet completedWT-28,
"Inspection 3:
Low Tire
Pressure
Warning
Lamp Flashes
When Ignition
Switch Is
Turned On"
Hazard warning lamp flashes when
ignition switch is turned on.BCM harness connector or circuit
BCMWT-29,
"Inspection 4:
Hazard Warn-
ing Lamp
Flashes When
Ignition
Switch Is
Turned On"
“TIRE PRESSURE” information in dis-
play does not exist.Fuse
Display unit
BCM WT-30,
"Inspection 5:
“TIRE PRES-
SURE” Infor-
mation In
Display Unit
Does Not
Exist"
ID registration cannot be completed.Transmitter
Remote keyless entry receiver harness connector or circuit
Remote keyless entry receiver
BCM harness connector or circuit
BCMWT-30,
"Inspection 6:
ID Registra-
tion Cannot
Be Com-
pleted"
Code/Symptom Malfunction partReference
page

TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
WT-23
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Revision: August 20072004 QX56
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMSPFP:00000
Inspection 1: Transmitter or Control Unit (BCM)EES0012H
MALFUNCTION CODE NO. 21, 22, 23 OR 24
1. CHECK CONTROL UNIT
Drive for several minutes. Check all tire pressures with CONSULT-II “DATA MONITOR ITEM”.
Are all tire pressures displayed as 0 kPa?
YES >> GO TO 2.
NO >> GO TO 3.
2. CHECK REMOTE KEYLESS ENTRY RECEIVER CONNECTOR
Check remote keyless entry receiver connector for damage or loose connections.
OK or NG
OK >> Replace BCM, then GO TO 3. Refer to BCS-19, "Removal and Installation of BCM" .
NG >> Repair or replace remote keyless entry receiver connector.
3. ID REGISTRATION
Carry out ID registration of all transmitters.
Is there a tire that cannot register ID?
YES >> Replace transmitter of the tire, then GO TO 5. Refer to WT-31, "Transmitter (Pressure Sensor)" .
NO >> GO TO 4.
4. VEHICLE DRIVING
Drive at a speed of 40 km/h (25 MPH) or more for several minutes without stopping.
Check all tire pressures with CONSULT-II “DATA MONITOR ITEM” within 15 minutes after vehicle speed
becomes 17 km/h (11 MPH).
Does
“DATA MONITOR ITEM” display tire pressure as normal without any warning lamp?
YES >> Inspection End.
NO >> GO TO 5.
5. ID REGISTRATION AND VEHICLE DRIVING
1. Carry out ID registration of all transmitters.
2. Drive at a speed of 40 km/h (25 MPH) or more for 3 minutes, and then drive the vehicle at any speed for
10 minutes. Then check all tire pressures with CONSULT-II “DATA MONITOR ITEM” within 5 minutes.
Does
“DATA MONITOR ITEM” display tire pressure as normal without any warning lamp?
YES >> Inspection End.
NO >> GO TO the inspection applicable to DTC.
Inspection 2: Transmitter - 1EES0012I
MALFUNCTION CODE NO. 31, 32, 33, 34, 41, 42, 43, 44, 45, 46, 47 OR 48
1. ID REGISTRATION (CORRECTION OF TRANSMITTER LOCATION)
1. Carry out ID registration of all transmitters.
2. Drive at a speed of 40 km/h (25 MPH) or more for 3 minutes, and then drive the vehicle at any speed for
10 minutes.
>> GO TO 2.

WT-24
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
Revision: August 20072004 QX56
2. REPLACE TRANSMITTER
1. Check low tire pressure warning lamp again for flashing, replace malfunctioning transmitter.
2. Carry out ID registration of all transmitters.
Can ID registration of all transmitters be completed?
YES >> GO TO 3.
NO >> GO TO Inspection 1. Refer to WT-23, "
Inspection 1: Transmitter or Control Unit (BCM)" .
3. VEHICLE DRIVING
Drive at a speed of 40 km/h (25 MPH) or more for 3 minutes, and then drive the vehicle at any speed for 10
minutes. Then check all tire pressures with CONSULT-II “DATA MONITOR ITEM” within 5 minutes.
Does
“DATA MONITOR ITEM” display tire pressure as normal without any warning lamp?
YES >> Inspection End.
NO >> Replace malfunctioning transmitter, and perform Step 3 again. Refer to WT-31, "
Transmitter
(Pressure Sensor)" .
Inspection 3: Transmitter - 2EES0012J
MALFUNCTION CODE NO. 35, 36, 37 OR 38
1. CHECK ALL TIRE PRESSURES
Check all tire pressures. Refer to WT-33, "
Tire" .
Are there any tires with pressure of 64 psi or more?
YES >> Adjust tire pressure to specified value.
NO >> GO TO 2.
2. VEHICLE DRIVING
1. Carry out ID registration of all transmitters.
2. Drive at a speed of 40 km/h (25 MPH) or more for several minutes without stopping.
Check all tire pressures with CONSULT-II “DATA MONITOR ITEM” within 15 minutes after vehicle speed
becomes 17 km/h (11 MPH).
>> Replace transmitter with new one if “DATA MONITOR ITEM” displays 64 psi or more. Refer to
WT-31, "
Transmitter (Pressure Sensor)" . Then GO TO 3.
3. ID REGISTRATION AND VEHICLE DRIVING
1. Carry out ID registration of all transmitters.
2. Drive at a speed of 40 km/h (25 MPH) or more for 3 minutes, and then drive the vehicle at any speed for
10 minutes. Then check all tire pressures with CONSULT-II “DATA MONITOR ITEM” within 5 minutes.
Does
“DATA MONITOR ITEM” display tire pressure as normal without any warning lamp?
YES >> Inspection End.
NO >> GO TO the inspection applicable to DTC.

TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
WT-25
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Revision: August 20072004 QX56
Inspection 4: Vehicle Speed SignalEES001PU
MALFUNCTION CODE NO. 52
1. SELF-DIAGNOSTIC RESULT CHECK
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. Select "BCM" on “SELECT SYSTEM” screen.
NOTE:
If the BCM is not indicated, refer to LAN-5, "
CAN COMMUNICATION" .
4. Select "BCM" on "SELECT WORK ITEM" screen, and select "SELF-DIAG RESULTS".
5. Check display contents in self-diagnostic results.
Is "CAN COMM CIRCUIT" displayed in the self-diagnosis display items?
YES >> Malfunction in CAN communication system. GO TO LAN-5, "CAN COMMUNICATION" .
NO >> GO TO 2.
2. CHECK BCM
Perform BCM diagnosis. Refer to BCS-11, "
CONSULT-II OPERATION" .
Inspection results OK?
OK >> Perform Vehicle Speed Sensor Inspection. Refer to EC-341, "Diagnostic Procedure" .
NG >> Replace BCM. Refer to BCS-19, "
Removal and Installation of BCM" .

WT-26
TROUBLE DIAGNOSIS FOR SYMPTOMS
Revision: August 20072004 QX56
TROUBLE DIAGNOSIS FOR SYMPTOMSPFP:00007
Inspection 1: Low Tire Pressure Warning Lamp Does Not Come On When Igni-
tion Switch Is Turned On
EES001PV
DIAGNOSTIC PROCEDURE
1. SELF-DIAGNOSTIC RESULT CHECK
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. Select "BCM" on “SELECT SYSTEM” screen.
NOTE:
If the BCM is not indicated, refer to LAN-5, "
CAN COMMUNICATION" .
4. Select "BCM" on "SELECT TEST ITEM" screen, and select "SELF-DIAG RESULTS".
5. Check display contents in self-diagnostic results.
Is "CAN COMM CIRCUIT" displayed in the self-diagnosis display items?
YES >> Malfunction in CAN communication system. Go To LAN-5, "CAN COMMUNICATION" .
NO >> GO TO 2.
2. CHECK COMBINATION METER
Check combination meter operation. Refer to DI-8, "
Combination Meter"
Inspection results OK?
OK >> GO TO 3.
NG >> Replace combination meter. Refer to IP-13, "
Combination Meter" .
3. CHECK LOW TIRE PRESSURE WARNING LAMP
Disconnect BCM harness connector.
Does the low tire pressure warning lamp activate?
YES >> Replace BCM. Refer to BCS-19, "Removal and Installation of BCM" .
NO >> Check combination meter and repair or replace.
Inspection 2: Low Tire Pressure Warning Lamp Stays On When Ignition Switch
Is Turned On
EES0012M
DIAGNOSTIC PROCEDURE
1. CHECK CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect BCM harness connectors M18 and M20.
3. Check terminals for damage or loose connections.
Inspection results OK?
OK >> GO TO 2.
NG >> Repair or replace damaged parts.

TROUBLE DIAGNOSIS FOR SYMPTOMS
WT-27
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Revision: August 20072004 QX56
2. CHECK POWER SUPPLY CIRCUIT (BAT)
Check voltage between BCM harness connector M20 terminal 70 (W/B) and ground.
1.
OK or NG
OK >> GO TO 3.
NG >> Check BCM power supply circuit for open or short.
3. CHECK POWER SUPPLY CIRCUIT (IGN)
1. Turn ignition switch ON.
2. Check voltage between BCM harness connector M18 terminal 38 (W/L) and ground.
OK or NG
OK >> GO TO 4.
NG >> Check BCM power supply circuit for open or short.
4. CHECK GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between BCM harness connector M20 terminal 67 (B) and ground.
OK or NG
OK >> Replace BCM. Refer to BCS-19, "Removal and Installa-
tion of BCM" .
NG >> Repair BCM ground circuit.Te r m i n a l s
Vo l ta g e
(Approx.)
(+) (–)
ConnectorTe r m i n a l
(Wire color)
Ground 12V
M20 70 (W/B)
LEIA0098E
Te r m i n a l s
Vo l ta g e
(Approx.)
(+) (–)
ConnectorTe r m i n a l
(Wire color)
Ground 12V
M18 38 (W/L)
WEIA0038E
Terminals Continuity
(+) (–)
ConnectorTe r m i n a l
(Wire color)
Ground Yes
M20 67 (B)
LIIA1040E

WT-28
TROUBLE DIAGNOSIS FOR SYMPTOMS
Revision: August 20072004 QX56
Inspection 3: Low Tire Pressure Warning Lamp Flashes When Ignition Switch
Is Turned On
EES0012N
NOTE:
If low tire pressure warning lamp flashes as shown, the system is normal.
Flash Mode A

This mode shows transmitter status is OFF-mode.
Carry out transmitter wake up operation. Refer to WT-15,
"Transmitter Wake Up Operation" .
DIAGNOSTIC PROCEDURE
1. CHECK CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect BCM harness connectors M18 and M20.
3. Check terminals for damage or loose connections.
Inspection results OK?
OK >> GO TO 2.
NG >> Repair or replace damaged parts.
2. CHECK TIRE PRESSURE WARNING CHECK CONNECTOR CIRCUIT
Check continuity between BCM harness connector M18 terminal 15 (L/W) and check connector M123 terminal
1 (L/W).
OK or NG
OK >> Replace BCM. Refer to BCS-19, "Removal and Installa-
tion of BCM" .
NG >> Repair or replace harness connector.
SEIA0347E
Continuity should exist
WEIA0097E

TROUBLE DIAGNOSIS FOR SYMPTOMS
WT-29
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Revision: August 20072004 QX56
Inspection 4: Hazard Warning Lamp Flashes When Ignition Switch Is Turned OnEES0012O
DIAGNOSTIC PROCEDURE
1. CHECK GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect BCM harness connector M20.
3. Check continuity between BCM harness connector M20 terminal 67 (B) and ground.
OK or NG
OK >> Replace BCM. Refer to BCS-19, "Removal and Installa-
tion of BCM" .
NG >> Repair BCM ground circuit.Te r m i n a l s
Continuity
(+) (–)
ConnectorTe r m i na l
(Wire color)
Ground Yes
M20 67 (B)LIIA1040E

WT-30
TROUBLE DIAGNOSIS FOR SYMPTOMS
Revision: August 20072004 QX56
Inspection 5: “TIRE PRESSURE” Information In Display Unit Does Not ExistEES001PW
DIAGNOSTIC PROCEDURE
1. SELF-DIAGNOSTIC RESULT CHECK
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. Select "BCM" on “SELECT SYSTEM” screen.
NOTE:
If the BCM is not indicated, refer to LAN-5, "
CAN COMMUNICATION" .
4. Select "BCM" on "SELECT TEST ITEM" screen, and select "SELF-DIAG RESULTS".
5. Check display contents in self-diagnostic results.
Is "CAN COMM CIRCUIT" displayed in the self-diagnosis display items?
YES >> Malfunction in CAN communication system. Go To LAN-5, "CAN COMMUNICATION" .
NO >> GO TO 2.
2. CHECK DISPLAY UNIT
Perform display unit self-diagnosis. Refer to AV- 1 0 4 , "
Self-Diagnosis Mode (NAVI)" .
Inspection results OK?
OK >> Replace BCM. Refer to BCS-19, "Removal and Installation of BCM" .
NG >> Repair or replace malfunctioning parts.
Inspection 6: ID Registration Cannot Be CompletedEES0012Q
DIAGNOSTIC PROCEDURE
1. ID REGISTRATION (ALL)
Carry out ID registration of all transmitters.
Can ID registration of all transmitters be completed?
YES >> Inspection End.
NO >> Go To WT-23, "
Inspection 1: Transmitter or Control Unit (BCM)" .

REMOVAL AND INSTALLATION
WT-31
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Revision: August 20072004 QX56
REMOVAL AND INSTALLATIONPFP:00000
Transmitter (Pressure Sensor)EES0012R
REMOVAL
1. Deflate tire. Unscrew transmitter retaining nut and allow transmitter to fall into tire.
2. Gently bounce tire so that transmitter falls to bottom of tire.
Place wheel and tire assembly on tire changing machine and
break both tire beads. Ensure that the transmitter remains at the
bottom of the tire while breaking the bead.
3. Turn tire so that valve hole is at bottom, and gently bounce the
tire to ensure transmitter is near valve hole. Carefully lift tire onto
turntable and position valve hole (and transmitter) 270 degrees
from mounting/dismounting head.
4. Lubricate tire well, and remove top side of tire. Reach inside the
tire and remove the transmitter.
5. Remove the second side of the tire as normal.
INSTALLATION
1. Place first side of tire onto rim.
2. Mount transmitter on rim and tighten nut.
NOTE:
Make sure no burrs exist in the valve stem hole of the wheel.
SEIA0047E
SEIA0048E
SEIA0049E
Transmitter nut : 5.5 N·m (0.56 kg-m, 49 in-lb)
WEIA0137E