air condition INFINITI QX56 2011 Factory Service Manual

WCS
SEAT BELT BUCKLE SWITCH SIGNAL CIRCUIT
WCS-41
< DTC/CIRCUIT DIAGNOSIS >
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SEAT BELT BUCKLE SWITCH SIGNAL CIRCUIT
Component Function CheckINFOID:0000000006222691
1.CHECK COMBINATION METER INPUT SIGNAL
Select the “Data Monitor” for the “METER/M& A” and check the “BUCKLE SW” monitor value.
>> INSPECTION END
Diagnosis ProcedureINFOID:0000000006222692
1.CHECK COMBINATION METER INPUT SIGNAL
1. Turn ignition switch ON.
2. Check voltage between combination meter harness connector and ground.
Is the inspection result normal?
YES >> Replace combination meter. Refer to MWI-85, "Removal and Installation".
NO >> GO TO 2.
2.CHECK SEAT BELT BUCKLE SWITCH CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect combination meter connector and seat belt buckle switch (driver side) connector.
3. Check continuity between combination meter harnes s connector and seat belt buckle switch (driver side)
harness connector.
4. Check harness continuity between comb ination meter harness connector and ground.
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair harness or connector.
3.CHECK SEAT BELT BUCKLE SWITCH GROUND CIRCUIT
Check harness continuity between seat belt buckle switch (driver side) harness connector and ground.
BUCKLE SW
When seat belt is fastened : Off
When seat belt is unfastened : On
Te r m i n a l s ConditionVol tag e
(Approx.)
(+) (-)
Combination meter
Ground
Connector Terminal
M34 35 When driver seat belt is fastened 12 V
When driver seat belt is unfastened 0 V
Combination meter Seat belt buckle switch (driver side)
Continuity
Connector Terminal Connector Terminal
M34 35 B76 3 Existed
Combination meter GroundContinuity
Connector Terminal
M34 35 Not existed
Revision: 2010 May2011 QX56

WCS-42
< DTC/CIRCUIT DIAGNOSIS >
SEAT BELT BUCKLE SWITCH SIGNAL CIRCUIT
Is the inspection result normal?
YES >> INSPECTION END
NO >> Repair harness or connector.
Component InspectionINFOID:0000000006222693
1.CHECK SEAT BELT BUCKLE SWITCH (DRIVER SIDE)
1. Turn ignition switch OFF.
2. Disconnect the seat belt buckle switch (driver side) connector.
3. Check continuity between terminals.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace seat belt buckle (driver side). Refer to SB-8, "
SEAT BELT BUCKLE : Removal and Instal-
lation".
Seat belt buckle switch (driver side)
GroundContinuity
Connector Terminal
B76 4 Existed
Terminal Condition Continuity
34 When seat belt is fastened Not existed
When seat belt is unfastened Existed
Revision: 2010 May2011 QX56

WCS
PARKING BRAKE SWITCH SIGNAL CIRCUITWCS-43
< DTC/CIRCUIT DIAGNOSIS >
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PARKING BRAKE SWITCH SIGNAL CIRCUIT
Diagnosis ProcedureINFOID:0000000006222530
1.CHECK COMBINATION METER INPUT SIGNAL
1. Turn ignition switch ON.
2. Check the voltage between combination meter harness connector and ground.
Is the inspection result normal?
YES >> INSPECTION END
NO >> GO TO 2.
2.CHECK PARKING BRAKE SWITCH SIGNAL CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect combination meter connecto r and parking brake switch connector.
3. Check continuity between combination meter har ness connector and parking brake switch harness con-
nector.
4. Check continuity between combination meter harness connector and ground.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Repair harness or connector.
Component InspectionINFOID:0000000006222531
1.CHECK PARKING BRAKE SWITCH
Check parking brake switch. Refer to BRC-118, "
Component Inspection".
Is the inspection result normal?
YES >> INSPECTION END.
NO >> Replace parking brake switch. Refer to PB-5, "
Exploded View".
(+) (−)
Condition Vo l ta g e
(Approx.)
Combination meter
Ground
Connector Terminal
M34 26 Ignition
switch ONWhen parking brake is applied 0 V
When parking brake is released 12 V
Te r m i n a l s
Continuity
Combination meter Parking brake switch
Connector Terminal Connector Terminal M34 26 M11 1 Existed
Te r m i n a l s Continuity
Combination meter
Ground
Connector Terminal
M34 26 Not existed
Revision: 2010 May2011 QX56

WCS
THE SEAT BELT WARNING CONTINUES SOUNDING, OR DOES NOT SOUND
WCS-45
< SYMPTOM DIAGNOSIS >
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THE SEAT BELT WARNING CONTIN UES SOUNDING, OR DOES NOT
SOUND
DescriptionINFOID:0000000006222694
 Seat belt warning chime does not sound.
 Seat belt warning chime sounds continuously.
Diagnosis ProcedureINFOID:0000000006222695
1.CHECK SEAT BELT WARNING LAMP
1. Turn ignition switch ON.
2. Check the operation of the seat belt warning lamp in the combination meter.
Is the inspection result normal?
YES >> GO TO 2.
NO >> GO TO 4.
2.CHECK BCM OUTPUT SIGNAL
Check if the seat belt warning chime is acti vated by performing BCM active test. Refer to WCS-20, "
BUZZER :
CONSULT-III Function (BCM - BUZZER)".
Is the inspection result normal?
YES >> INSPECTION END
NO >> GO TO 3.
3.CHECK COMBINATION METER INPUT SIGNAL
Check if buzzer switches to proper condition (On/Off) on data monitor of combination meter. Refer to WCS-14,
"CONSULT-III Function".
Is the inspection result normal?
YES >> Replace combination meter. Refer to MWI-85, "Removal and Installation".
NO >> Replace BCM. Refer to BCS-81, "
Removal and Installation".
4.CHECK SEAT BELT BUCKLE SWITCH (DRIVER SIDE) CIRCUIT
Perform the check for the seat belt buckle switch (driver side) circuit. Refer to WCS-41,
"DiagnosisProcedure".
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair harness or connector.
5.CHECK SEAT BELT BUCKLE SWITCH (DRIVER SIDE)
Perform a unit check for the seat belt buckle switch (driver side). Refer to WCS-42, "
Component Inspection".
Is the inspection result normal?
YES >> Replace combination meter. Refer to MWI-85, "Removal and Installation".
NO >> Replace seat belt buckle (driver side). Refer to SB-8, "
SEAT BELT BUCKLE : Removal and Instal-
lation".
Seat belt fastened : OFF
Seat belt not fastened : ON
Buzzer active condition : On
Buzzer non-active condition : Off
Revision: 2010 May2011 QX56

WT-2
DTC Logic ...............................................................39
Diagnosis Procedure ..............................................39
C1729 VEHICLE SPEED SIGNAL ....................41
DTC Logic ............................................................ ...41
Diagnosis Procedure ..............................................41
C1750, C1751, C1752, C1753 RECEIVER ........42
DTC Logic ............................................................ ...42
Diagnosis Procedure ..............................................42
C1754 LOW TIRE PRESSURE WARNING
CONTROL UNIT ................................................
45
DTC Logic ............................................................ ...45
Diagnosis Procedure ..............................................45
C1755, C1756, C1757, C1758 POOR RE-
CEIVING CONDITIONS .....................................
47
DTC Logic ............................................................ ...47
Diagnosis Procedure ..............................................47
U1000 CAN COMM CIRCUIT ............................49
Description ........................................................... ...49
DTC Logic ...............................................................49
Diagnosis Procedure ..............................................49
U1010 CONTROL UNIT (CAN) .........................50
Description ........................................................... ...50
DTC Logic ...............................................................50
Diagnosis Procedure ..............................................50
POWER SUPPLY AND GROUND CIRCUIT .....51
Diagnosis Procedure ........................................... ...51
LOW TIRE PRESSURE WARNING LAMP .......52
Component Function Check ................................ ...52
Diagnosis Procedure ..............................................52
SYMPTOM DIAGNOSIS .............................53
TPMS SYMPTOMS ......................................... ...53
Symptom Table ................................................... ...53
LOW TIRE PRESSURE WARNING LAMP
DOES NOT TURN ON .......................................
56
Description ........................................................... ...56
Diagnosis Procedure ..............................................56
LOW TIRE PRESSURE WARNING LAMP
DOES NOT TURN OFF .....................................
57
Description ........................................................... ...57
Diagnosis Procedure ..............................................57
LOW TIRE PRESSURE WARNING LAMP
BLINKS ..............................................................
58
Description ........................................................... ...58
Diagnosis Procedure ............................................ ...58
TIRE INFLATION INDICATOR DOES NOT
ACTIVATE .........................................................
59
Description ........................................................... ...59
Diagnosis Procedure ...............................................59
ID REGISTRATION CANNOT BE COMPLET-
ED ......................................................................
60
Description ........................................................... ...60
Diagnosis Procedure ..............................................60
NOISE, VIBRATION AND HARSHNESS
(NVH) TROUBLESHOOTING ............................
61
NVH Troubleshooting Chart ................................. ...61
PERIODIC MAINTENANCE .......................62
ROAD WHEEL ................................................ ...62
Adjustment ........................................................... ...62
Tire Rotation ...........................................................63
REMOVAL AND INSTALLATION ..............64
ROAD WHEEL TIRE ASSEMBLY ................. ...64
Exploded View ..................................................... ...64
Removal and Installation .........................................64
Inspection ................................................................64
LOW TIRE PRESSURE WARNING CON-
TROL UNIT ........................................................
65
Exploded View ..................................................... ...65
Removal and Installation .........................................65
TRANSMITTER .................................................66
Exploded View ..................................................... ...66
Removal and Installation .........................................66
TIRE PRESSURE RECEIVER ...........................68
Exploded View ..................................................... ...68
FRONT TIRE PRESSURE RECEIVER .................. ...68
FRONT TIRE PRESSURE RECEIVER : Removal
and Installation ........................................................
68
REAR TIRE PRESSURE RECEIVER .......................68
REAR TIRE PRESSURE RECEIVER : Removal
and Installation ..................................................... ...
68
SERVICE DATA AND SPECIFICATIONS
(SDS) .......... ................................................
69
SERVICE DATA AND SPECIFICATIONS
(SDS) .............................................................. ...
69
Road Wheel ......................................................... ...69
Tire Air Pressure .....................................................69
Revision: 2010 May2011 QX56

WT-14
< ECU DIAGNOSIS INFORMATION >
LOW TIRE PRESSURE WARNING CONTROL UNIT
ECU DIAGNOSIS INFORMATION
LOW TIRE PRESSURE WARNING CONTROL UNIT
Reference ValueINFOID:0000000006225497
VALUES ON THE DIAGNOSIS TOOL
CAUTION:
The reference values in the table below come from the control unit calculation data. The normal values
may in some cases be displayed even though the power circuit (harness) is open or shorted.
TERMINAL LAYOUT
PHYSICAL VALUES
CAUTION:
When using circuit tester to measure voltage for in spection, be sure not to extend forcibly any con-
nector terminals.
Monitor item Condition Value/Status
VHCL SPEED SE Vehicle stopped 0.00 km/h (0.00 mph)
Vehicle running
CAUTION:
Check air pressure of tire under standard condition. Approx. equal to the indication
on speedometer (Inside of
±
10%)
AIR PRESS FL Start engine and drive at 40 km/h (25 MPH) or more for 10 minutes. Approximately equal to the indi-
cation on tire gauge value for
front LH tire
AIR PRESS FR Start engine and drive at 40 km/h (25 MPH) or more for 10 minutes. Approximately equal to the indi-
cation on tire gauge value for
front RH tire
AIR PRESS RR Start engine and drive at 40 km/h (25 MPH) or more for 10 minutes. Approximately equal to the indi-
cation on tire gauge value for
rear RH tire
AIR PRESS RL Start engine and drive at 40 km/h (25 MPH) or more for 10 minutes. Approximately equal to the indi-
cation on tire gauge value for
rear LH tire
ID REGST FL1 Front LH transmitter ID registered Done
Front LH transmitter ID unregistered Yet
ID REGST FR1 Front RH transmitter ID registered Done
Front RH transmitter ID unregistered Yet
ID REGST RR1 Rear RH transmitter ID registered Done
Rear RH transmitter ID unregistered Yet
ID REGST RL1 Rear LH transmitter ID registered Done
Rear LH transmitter ID unregistered Yet
WARNING LAMP Low tire pressure
warning lamp: ON On
Low tire pressure warning lamp: OFF Off
JSEIA0024ZZ
Revision: 2010 May2011 QX56

C1704, C1705, C1706, C1707 LOW TIRE PRESSURE
WT-31
< DTC/CIRCUIT DIAGNOSIS >
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DTC/CIRCUIT DIAGNOSIS
C1704, C1705, C1706, C1707 LOW TIRE PRESSURE
DTC LogicINFOID:0000000006225508
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION
With CONSULT-III
1. Turn the ignition switch ON.
CAUTION:
Never start the engine.
2. Check the tire pressure for all wheels and adjust to the specified value. Refer to WT-69, "
Tire Air Pres-
sure".
3. Perform self-diagnosis for “AIR PRESSURE MONITOR”.
Is DTC
“C1704”, “C1705”, “C1706”, or “C1707” detected?
YES >> Proceed to WT-31, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006225509
1.CHECK TIRE PRESSURE
Check the air pressure of all wheels. Refer to WT-69, "
Tire Air Pressure".
Is the inspection result normal?
YES >> Replace the DTC-detected malfunctioning transmitter. Refer to WT-66, "Removal and Installa-
tion".
NO >> After adjusting the air pressure, GO TO 2.
2.CHECK TIRE PRESSURE SIGNAL
With CONSULT-III
1. Drive for 3 minutes at a speed of 40 km/h (25 MPH) or more, then drive normally for 10 minutes.
2. Stop the vehicle.
3. Select “DATA MONITOR” for “AIR PRESSURE MONITOR” with CONSULT-III.
4. Within 5 minutes after vehicle stopped, check t hat the tire pressures match the standard value.
Is the inspection result normal?
YES >> INSPECTION END
DTC Display Item Malfunction detected condition Possible causes
C1704 LOW PRESSURE FL Front LH wheel pressure drops to 189 kPa (1.93 kg/cm
2, 27.4 psi)
or less
Low tire pressure
C1705 LOW PRESSURE FR
Front RH wheel pressure drops to 189 kPa (1.93 kg/cm
2, 27.4 psi)
or less
C1706 LOW PRESSURE RR Rear RH wheel pressure drops to 189 kPa (1.93 kg/cm
2, 27.4 psi)
or less
C1707 LOW PRESSURE RL Rear LH wheel pressure drops to 189 kPa (1.93 kg/cm
2, 27.4 psi) or
less
Monitor item Displayed value
AIR PRESS FL Approximately equal to the indication on tire gauge value for front LH tire
AIR PRESS FR Approximately equal to the indication on tire gauge value for front RH tire
AIR PRESS RR Approximately equal to the indica tion on tire gauge value for rear RH tire
AIR PRESS RL Approximately equal to the indication on tire gauge value for rear LH tire
Revision: 2010 May2011 QX56

C1708, C1709, C1710, C1711 TRANSMITTER (NO DATA)
WT-33
< DTC/CIRCUIT DIAGNOSIS >
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C1708, C1709, C1710, C1711 TRANSMITTER (NO DATA)
DTC LogicINFOID:0000000006225510
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION
With CONSULT-III
1. Drive for 3 minutes at a speed of 40 km/h (25 MPH) or more, then drive normally for 10 minutes.
2. Stop the vehicle.
3. Perform self-diagnosis for “AIR PRESSURE MONITOR”.
Is DTC
“C1708”, “C1709”, “C1710” or “C1711” detected?
YES >> Proceed to WT-33, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006225511
1.CHECK TIRE PRESSURE SIGNAL
With CONSULT-III
1. Drive for 3 minutes at a speed of 40 km/h (25 MPH) or more, then drive normally for 10 minutes.
2. Stop the vehicle.
3. Select “DATA MONITOR” for “AIR PRESSURE MONITOR” with CONSULT-III.
4. Within 5 minutes after vehicle stopped, read the val ues that are displayed for “AIR PRESS FL”, “AIR
PRESS FR”, “AIR PRESS RR”, and “AIR PRESS RL”.
Are all tire pressures displayed 0 kPa (psi)?
YES >> GO TO 2.
NO >> GO TO 5.
2.CHECK RECEIVER CIRCUIT
1. Turn the ignition switch OFF.
2. Disconnect low tire pressure warning control unit harness connector and tire pressure receiver harness connector.
3. Check the continuity between low tire pressure warning control unit harness connector and tire pressure
receiver harness connector.
CHECK RECEIVER POWER CIRCUIT
DTC Display Item Malfunction detected condition Possible causes
C1708 [NO DATA] FL Tire pressure data signal from the front LH wheel
transmitter cannot be detected.
 Harness or connector connec-
tion malfunction
(Tire pressure re ceiver, low tire
pressure warning control unit)
 Transmitter ID registration in-
complete
 Transmitter malfunction
 Transmitter battery voltage
C1709 [NO DATA] FR
Tire pressure data signal from the front RH wheel
transmitter cannot be detected.
C1710 [NO DATA] RR Tire pressure data signal from the rear RH wheel
transmitter cannot be detected.
C1711 [NO DATA] RL Tire pressure data signal from the rear LH wheel
transmitter cannot be detected.
Low tire pressure wa
rning control unit Tire pressure receiver
Continuity
Connector Terminal Connector Terminal
M96 10 E53 (Front LH)
1 Existed
9 E19 (Front RH)
8 B43 (Rear LH)
7 B212 (Rear RH)
Revision: 2010 May2011 QX56

C1716, C1717, C1718, C1719 TRANSMITTER (PRESSURE DATA)
WT-37
< DTC/CIRCUIT DIAGNOSIS >
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C1716, C1717, C1718, C1719 TRAN SMITTER (PRESSURE DATA)
DTC LogicINFOID:0000000006225512
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION
With CONSULT-III
1. Turn the ignition switch ON.
CAUTION:
Never start the engine.
2. Check the tire pressure for all wheels and adjust to the specified value. Refer to WT-69, "
Tire Air Pres-
sure".
3. Perform self-diagnosis for “AIR PRESSURE MONITOR”.
Is DTC
“C1716”, “C1717”, “C1718”, or “C1719” detected?
YES >> Proceed to WT-37, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006225513
1.CHECK TIRE PRESSURE
Check the air pressure of all wheels. Refer to WT-69, "
Tire Air Pressure".
Is the inspection result normal?
YES >> Replace the DTC-detected malfunctioning transmitter. Refer to WT-66, "Removal and Installa-
tion".
NO >> After adjusting the air pressure, GO TO 2.
2.CHECK TIRE PRESSURE SIGNAL
With CONSULT-III
DTC Display Item Malfunction detected condition Possible causes
C1716 [PRESSDATA ERR] FL Malfunction in the tire pressure data from the
front LH wheel transmitter.
NOTE:
In this case the low tire pressure warning
control unit judges that the tire pressure is
438.60 kPa (4.47 kg/cm
2, 63.60 psi).
 Transmitter ID registration in-
complete
 Transmitter malfunction
C1717 [PRESSDATA ERR] FR
Malfunction in the tire pressure data from the
front RH wheel transmitter.
NOTE:
In this case the low tire pressure warning
control unit judges that the tire pressure is
438.60 kPa (4.47 kg/cm
2, 63.60 psi).
C1718 [PRESSDATA ERR] RR Malfunction in the tire pressure data from the
rear RH wheel transmitter.
NOTE:
In this case the low tire pressure warning
control unit judges that the tire pressure is
438.60 kPa (4.47 kg/cm
2, 63.60 psi).
C1719 [PRESSDATA ERR] RL Malfunction in the tire pressure data from the
rear LH wheel transmitter.
NOTE:
In this case the low tire pressure warning
control unit judges that the tire pressure is
438.60 kPa (4.47 kg/cm
2, 63.60 psi).
Revision: 2010 May2011 QX56

C1728 RECEIVER IDWT-39
< DTC/CIRCUIT DIAGNOSIS >
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C1728 RECEIVER ID
DTC LogicINFOID:0000000006225514
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION
With CONSULT-III
1. Drive for 3 minutes at a speed of 40 km/h (25 MPH) or more, then drive normally for 10 minutes.
2. Stop the vehicle.
3. Perform self-diagnosis for “AIR PRESSURE MONITOR”.
Is DTC
“C1728” detected?
YES >> Proceed to WT-39, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006225515
1.CHECK TIRE PRESSURE RECEIVER INPUT SIGNAL
1. Turn the ignition switch ON. CAUTION:
Never start engine.
2. Use an oscilloscope and check the input signal waveform between the low tire pressure warning control
unit harness connector and ground.
STANDBY STATUS
WHEN SIGNAL IS RECEIVED
Is the inspection result normal?
DTC Display Item Malfunction detected condition Possible causes
C1728 RECEIVER ID NO REG Receiver ID registration cannot be performed.  Tire pressure receiver malfunc-
tion
 Low tire pressure warning con- trol unit malfunction
Low tire pressure warning control unit — Value (Approx.)
Connector Terminal
M96 3
Ground
Approx. 4.5 V
4
5
6
Low tire pressure warning control unit — Value (Approx.)
Connector Terminal
M96 3
Ground Approx. 4.5 V
4
5
6
OCC3879D
OCC3880D
Revision: 2010 May2011 QX56