ignition INFINITI QX56 2004 Factory Service Manual

TROUBLE DIAGNOSES
WT-15
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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

WT-20
TROUBLE DIAGNOSES
Revision: August 20072004 QX56
Preliminary CheckEES0012F
BASIC INSPECTION
1. CHECK ALL TIRE PRESSURES
Check all tire pressures. Refer to WT-33, "
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 low tire pressure warning lamp activate for 1 second when ignition switch is turned ON?
YES >> GO TO 3.
NO >> Check fuse and combination meter.
3. CHECK 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 transmitter activation tool battery.

TROUBLE DIAGNOSES
WT-21
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Malfunction Code/Symptom ChartEES0012G
Code/Symptom Malfunction partReference
page
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18Front-left tire pressure drops to 193 kPa (2.0 kg/cm
2 , 28 psi) or less
Front-right tire pressure drops to 193 kPa (2.0 kg/cm2 , 28 psi) or less
Rear-right tire pressure drops to 193 kPa (2.0 kg/cm2 , 28 psi) or less
Rear-left tire pressure drops to 193 kPa (2.0 kg/cm2 , 28 psi) or less—
21
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24Transmitter no data (front - left)
Transmitter no data (front - right)
Transmitter no data (rear - right)
Transmitter no data (rear - left)WT-23,
"Inspection 1:
Transmitter or
Control Unit
(BCM)"
31
32
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34Transmitter checksum error (front - left)
Transmitter checksum error (front - right)
Transmitter checksum error (rear - right)
Transmitter checksum error (rear - left)WT-23,
"Inspection 2:
Tran s mitte r -
1"
35
36
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38Transmitter pressure data error (front - left)
Transmitter pressure data error (front - right)
Transmitter pressure data error (rear - right)
Transmitter pressure data error (rear - left)WT-24,
"Inspection 3:
Tran s mitte r -
2"
41
42
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44Transmitter function code error (front - left)
Transmitter function code error (front - right)
Transmitter function code error (rear - right)
Transmitter function code error (rear - left)WT-23,
"Inspection 2:
Tran s mitte r -
1"
45
46
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48Transmitter battery voltage low (front - left)
Transmitter battery voltage low (front - right)
Transmitter battery voltage low (rear - right)
Transmitter battery voltage low (rear - left)WT-23,
"Inspection 2:
Tran s mitte r -
1"
52 Vehicle speed signalWT-25, "Inspection 4:
Vehicle Speed
Signal"
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-26,
"Inspection 1:
Low Tire
Pressure
Warning
Lamp Does
Not Come On
When Ignition
Switch Is
Turned On"
Low tire pressure warning lamp stays
on when ignition switch is turned on.Combination meter
BCM connector or circuit
BCMWT-26,
"Inspection 2:
Low Tire
Pressure
Warning
Lamp Stays
On When
Ignition
Switch Is
Turned On"

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-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