INFINITI QX56 2011 Factory Service Manual

SBC-44
< DTC/CIRCUIT DIAGNOSIS >
B2457 CONTROL UNIT AS
B2457 CONTROL UNIT AS
DTC LogicINFOID:0000000006237912
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.SELF-DIAGNOSIS WITH PRE-CRASH SEAT BELT CONTROL UNIT
1. Turn ignition switch ON.
2. Check “Self-diagnostic result” with CONSULT-III.
Is DTC detected?
YES >> Refer to SBC-44, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006237913
1..INSPECTION START
1. Check “Self-diagnostic result” with CONSULT-III.
2. Touch “ERASE”.
3. Perform DTC Confirmation Procedure. See SBC-44, "
DTC Logic".
Is DTC B2457 displayed again?
YES >> Replace pre-crash seat belt control unit (passenger side).
NO >> GO TO 2.
2.CHECK INTERMITTENT INCIDENT
Refer to GI-40, "
Intermittent Incident".
>> INSPECTION END
DTC No. Self-diagnosis item DTC Detection Condition Possible causes
B2457 CONTROL UNIT AS Pre-crash seat belt control unit (passenger side) in-
ternal circuit malfunction Pre-crash seat belt control unit (passenger
side)
Revision: 2010 May2011 QX56

B2458 LOCAL COMMSBC-45
< DTC/CIRCUIT DIAGNOSIS >
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SBC
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B2458 LOCAL COMM
DTC LogicINFOID:0000000006237914
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.SELF-DIAGNOSIS WITH PRE-CRASH SEAT BELT CONTROL UNIT
1. Turn ignition switch ON.
2. Check “Self-diagnostic result” with CONSULT-III.
Is DTC detected?
YES >> Refer to SBC-45, "Diagnosis Procedure".
NO >> INSPECTIN END
Diagnosis ProcedureINFOID:0000000006237915
1.CHECK POWER SUPPLY AND GROUND CIRCUIT
Check pre-crash seat belt control unit power supply and ground circuit. Refer to SBC-43, "
Diagnosis Proce-
dure".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace malfunctioning parts.
2.CHECK LOCAL COMMUNICATION LINE CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect pre-crash seat belt control unit (driver side and passenger side) harness connector.
3. Check continuity between pre-crash seat belt cont rol unit (driver side) harness connector and pre-crash
seat belt control unit (passenger side).
4. Check continuity between pre-crash seat belt control unit (driver side) harness connector and ground.
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair or replace harness or connector.
3.REPLACE PRE-CRASH SEAT BELT CONTROL UNIT (PASSENGER SIDE)
1. Replace pre-crash seat belt control unit (passenger side). Refer to SB-6, "
SEAT BELT RETRACTOR :
Removal and Installation".
2. Check “Self-diagnostic result” with CONSULT-III.
DTC No. Self-diagnosis item DTC Detection Condition Possible causes
B2458 LOCAL COMM Receipt of a malfunction signal between pre-
crash seat belt control unit (driver side) and
pre-crash seat belt control unit (passenger
side)  Harness or connectors
[The pre-crash seat belt control unit (driver side)
and pre-crash seat belt (passenger side) circuit
is open or shorted]
 Pre-crash seat belt control unit (driver side)
 Pre-crash seat belt control (passenger side)
Pre-crash seat belt control unit (driver side) Pre -crash seat belt control unit (passenger side)
Continuity
Connector Terminal Connector Terminal
B9 8
B231 8
Existed
16 16
Pre-crash seat belt control unit (driver side) GroundContinuity
Connector Terminal
B9 8
Not existed
16
Revision: 2010 May2011 QX56

SBC-46
< DTC/CIRCUIT DIAGNOSIS >
B2458 LOCAL COMM
Is DTC detected?
YES >> GO TO 4.
NO >> INSPECTION END
4.REPLACE PRE-CRASH SEAT BELT CONTROL UNIT (DRIVER SIDE)
1. Replace pre-crash seat belt control unit (driver side). Refer to SB-6, "
SEAT BELT RETRACTOR :
Removal and Installation".
2. Check “Self-diagnostic result” with CONSULT-III.
Is DTC detected?
YES >> GO TO 5.
NO >> INSPECTION END
5.CHECK INTERMITTENT INCIDENT
Refer to GI-40, "
Intermittent Incident".
>> INSPECTION END
Revision: 2010 May2011 QX56

B2461 VHCL SPEED SIGNALSBC-47
< DTC/CIRCUIT DIAGNOSIS >
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B2461 VHCL SPEED SIGNAL
DescriptionINFOID:0000000006237916
Inputs the vehicle speed signal from combination meter via CAN communication.
DTC LogicINFOID:0000000006237917
DTC DETECTION LOGIC
NOTE:
If DTC B2461 is displayed with DTC U1000, first per form the trouble diagnosis for DTC U1000. Refer to SBC-
35, "DTC Logic".
DTC CONFIRMATION PROCEDURE
1.SELF-DIAGNOSIS WITH PRE-CRASH SEAT BELT CONTROL UNIT
1. Turn ignition switch ON.
2. Check “Self-diagnostic result” with CONSULT-III.
Is DTC detected?
YES >> Refer to SBC-47, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006237918
1.CHECK COMBINATION METER
Check combination meter. Refer to MWI-57, "
Work flow".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace malfunctioning parts.
2.CHECK INTERMITTENT INCIDENT
Refer to GI-40, "
Intermittent Incident".
>> INSPECTION END
DTC No. Self-diagnosis item DTC De tection Condition Possible causes
B2461 VHCL SPEED SIGNAL Receipt of a malfunction signal of the vehicle speed signal Combination meter
Revision: 2010 May2011 QX56

SBC-48
< DTC/CIRCUIT DIAGNOSIS >
B2463 ROLLOVER SIGNAL
B2463 ROLLOVER SIGNAL
DescriptionINFOID:0000000006237919
Inputs the rollover signal from air bag diagnosis sensor unit via CAN communication.
DTC LogicINFOID:0000000006237920
DTC DETECTION LOGIC
NOTE:
If DTC B2463 is displayed with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to SBC-
35, "DTC Logic".
DTC CONFIRMATION PROCEDURE
1.SELF-DIAGNOSIS WITH PRE-CRASH SEAT BELT CONTROL UNIT
1. Turn ignition switch ON.
2. Check “Self-diagnostic result” with CONSULT-III.
Is DTC detected?
YES >> Refer to SBC-48, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006237921
1.CHECK DTC WITH AIR BAG DIAGNOSIS SENSOR UNIT
Check “self-diagnostic result” for “AIR BAG DIAGNO SIS SENSOR UNIT” with CONSULT-III. Refer to SRC-19,
"CONSULT-III Function".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Replace air bag diagnosis sensor unit. Refer to SR-26, "
Removal and Installation".
2.CHECK INTERMITTENT INCIDENT
Refer to GI-40, "
Intermittent Incident".
>> INSPECTION END
DTC No. Self-diagnosis item DTC De tection Condition Possible causes
B2463 ROLLOVER SIGNAL Receipt of a malfunction signal of the rollover signal Air bag diagnosis sensor unit
Revision: 2010 May2011 QX56

B2466 DR/AS CONTROL UNITSBC-49
< DTC/CIRCUIT DIAGNOSIS >
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B2466 DR/AS CONTROL UNIT
DTC LogicINFOID:0000000006237922
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.SELF-DIAGNOSIS WITH PRE-CRASH SEAT BELT CONTROL UNIT
1. Turn ignition switch ON.
2. Check “Self-diagnostic result” with CONSULT-III.
Is DTC detected?
YES >> Refer to SBC-49, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006237923
1.CHECK THE VEHICLE SPECIFICATION
Check the part number.
Does the part application fit to the vehicle specification?
YES >> GO TO 2.
NO >> Replace the malfunction parts.
2.CHECK INTERMITTENT INCIDENT
Refer to GI-40, "
Intermittent Incident".
>> INSPECTION END
DTC No. Self-diagnosis item DTC Detection Condition Possible causes
B2466 DR/AS CONTROL UNIT Pre-crash seat belt control unit is out of the
vehicle specification  Pre-crash seat belt co
ntrol unit (driver side)
 Pre-crash seat belt co ntrol unit (passenger
side)
Revision: 2010 May2011 QX56

SBC-50
< DTC/CIRCUIT DIAGNOSIS >
B2470 SYS HEAT PROTC DR
B2470 SYS HEAT PROTC DR
DescriptionINFOID:0000000006237924
When fastening and unfastening seat belt or opening and closing door is repeated continuously for a short
period of time, the system temporarily deactivates the retracting function of seat belt to prevent excessive
heating. The system recovers automatically.
DTC LogicINFOID:0000000006237925
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.SELF-DIAGNOSIS WITH PRE-CRASH SEAT BELT CONTROL UNIT
1. Turn ignition switch ON.
2. Check “Self-diagnostic result” with CONSULT-III.
Is DTC detected?
YES >> Refer to SBC-50, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006237926
1.CHECK THE VEHICLE CONDITION WITH CONSULT-III DATA MONITOR
1. Check “HEAT PROTC LH” in “D ATA MONITOR” with CONSULT-III.
2. Wait until “OFF” appears.
3. Perform the “self-diagnosis result” with CONSULT-III, after performing the check.
4. Touch “ERASE”.
5. Perform DTC Confirmation Procedure. Refer to SBC-50, "
DTC Logic".
Is DTC B2470 displayed again?
YES >> GO TO 2.
NO >> INSPECTION END
2.CHECK INTERMITTENT INCIDENT
Refer to GI-40, "
Intermittent Incident".
>> INSPECTION END
DTC No. Self-diagnosis item DTC Detection Condition Possible causes
B2470 SYS HEAT PROTC DR Deactivate s to prevent excessive heating Comfort function activates continuously in a
short period of time.
Revision: 2010 May2011 QX56

B2471 SYS HEAT PROTC ASSBC-51
< DTC/CIRCUIT DIAGNOSIS >
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B2471 SYS HEAT PROTC AS
DescriptionINFOID:0000000006237927
When fastening and unfastening seat belt or opening and cl osing door is repeated continuously for a short
period of time, the system temporar ily deactivates the retracting function of seat belt to prevent excessive
heating. The system recovers automatically.
DTC LogicINFOID:0000000006237928
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.SELF-DIAGNOSIS WITH PRE-CRASH SEAT BELT CONTROL UNIT
1. Turn ignition switch ON.
2. Check “Self-diagnostic result” with CONSULT-III.
Is DTC detected?
YES >> Refer to SBC-51, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006237929
1.CHECK THE VEHICLE CONDITION WITH CONSULT-III DATA MONITOR
1. Check “HEAT PROTC RH” in “DATA MONITOR” with CONSULT-III.
2. Wait until “OFF” appears.
3. Perform the “self-diagnosis results” wit h CONSULT-III, after performing the check.
4. Touch “ERASE”.
5. Perform DTC Confirmation Procedure. Refer to SBC-51, "
DTC Logic".
Is DTC B2471 displayed again?
YES >> GO TO 2.
NO >> INSPECTION END
2.CHECK INTERMITTENT INCIDENT
Refer to GI-40, "
Intermittent Incident".
>> INSPECTION END
DTC No. Self-diagnosis item DTC Detection Condition Possible causes
B2471 SYS HEAT PROTC AS Deactivate s to prevent excessive heating Belt retracting function activates continuously in
the short period of time
Revision: 2010 May2011 QX56

SBC-52
< DTC/CIRCUIT DIAGNOSIS >
POWER SUPPLY AND GROUND CIRCUIT
POWER SUPPLY AND GROUND CIRCUIT
Diagnosis ProcedureINFOID:0000000006237930
1.CHECK GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect pre-crash seat belt control unit (driver side and passenger side) harness connector.
3. Check continuity between pre-crash seat belt c ontrol unit (driver side and passenger side) harness con-
nector and ground.
Is the measurement value normal?
YES >> GO TO 2.
NO >> Repair or replace harness or connector.
2.CHECK POWER SUPPLY CIRCUIT-I
Check voltage between pre-crash seat belt control unit (driver side and passenger side) harness connector
and ground.
Is the measurement value normal?
YES >> INSPECTION END
NO >> GO TO 3.
3.CHECKPOWER SUPPLY CIRCUIT-II
1. Disconnect fuse block (J/B) harness connector.
2. Check continuity between pre-crash seat belt c ontrol unit (driver side and passenger side) harness con-
nector and fuse block (J/B) harness connector.
3. Check continuity between pre-crash seat belt c ontrol unit (driver side and passenger side) harness con-
nector and ground.
Is the measurement value normal?
YES >> Check 10 A fuse (No. 6).
NO >> Repair or replace harness or connector.
Pre-crash seat belt control unit GroundContinuity
Connector Terminal
B9 (Driver side) 18
Existed
20
B231 (Passenger side) 18
20
Pre-crash seat belt control unit
GroundVo l ta g e
(Approx.)
Connector Terminal
B9 (Driver side) 1 Battery voltage
B231 (Passenger side)
Pre-crash seat belt control unit Fuse block (J/B) Continuity
Connector Terminal Connector Terminal
B9 (Driver side) 1 M2 6B Existed
B231 (Passenger side)
Pre-crash seat belt control unit GroundContinuity
Connector Terminal
B9 (Driver side) 1 Not existed
B231 (Passenger side)
Revision: 2010 May2011 QX56

SEAT BELT BUCKLE SWITCH (DRIVER SIDE)
SBC-53
< DTC/CIRCUIT DIAGNOSIS >
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SEAT BELT BUCKLE SW ITCH (DRIVER SIDE)
Component Function CheckINFOID:0000000006237931
1.CHECK SEAT BELT WARNING LAMP FUNCTION
1. Turn ignition switch ON.
2. Sits in the passenger seat.
3. Fasten the seat belt (passenger side).
4. Check seat belt warning lamp function.
Is the inspection results normal?
YES >> GO TO 2.
NO >> Check seat belt warning lamp circuit. Refer to SBC-57, "
Diagnosis Procedure".
2.CHECK PRE-CRASH SEAT BELT CONTROL UNIT (DRIVER SIDE) FUNCTION
With CONSULT-III
When checking “BUCKLE SW LH” on DATA MONITOR scr een, check that ON/OFF display changes synchro-
nized with the insertion operat ion to the seat belt buckle.
Is the inspection result normal?
YES >> Seat belt buckle switch (driver side) circuit is normal.
NO >> Check seat belt buckle switch (driver side). Refer to SBC-53, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000006237932
1.CHECK PRE-CRASH SEAT BELT CONTROL UNIT (DRIVER SIDE) OUTPUT SIGNAL
1. Turn ignition switch OFF.
2. Disconnect seat belt assembly (driver side) harness connector.
3. Turn ignition switch ON.
4. Check voltage between seat belt assembly (driver side) harness connector and ground.
Is the inspection result normal?
YES >> GO TO 3.
NO >> GO TO 2.
2.CHECK SEAT BELT ASSEMB LY (DRIVER SIDE) CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect pre-crash seat belt control unit (driver side) harness connector.
3. Check continuity between pre-crash seat belt cont rol unit (driver side) harness connector and seat belt
assembly (driver side) harness connector.
Condition Seat belt warning lamp
Seat belt (driver side) is fastened Not illuminated
Seat belt (driver side) is unfastened Illuminated
Monitor item Condition
BUCKLE SW LH When driver side seat belt is not fastened: OFF
When driver side seat belt is fastened: ON
(+)
(–)Voltage (V)
(Approx.)
Seat belt assembly (driver side)
Connector Terminal B76 5 Ground 5
Pre-crash seat belt control unit (driver side) Seat belt assembly (driver side) Continuity
Connector Terminal Connector Terminal
B9 6 B76 5 Existed
Revision: 2010 May2011 QX56