2011 INFINITI QX56 ground

SBC-38
< DTC/CIRCUIT DIAGNOSIS >
B2453 BR STROKE SEN CIRC
B2453 BR STROKE SEN CIRC
DTC LogicINFOID:0000000006237903
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-38, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006237904
1.CHECK PRE-CRASH SEAT BELT CONTROL UNIT INPUT SIGNAL
1. Turn ignition switch ON.
2. Select “BRK PEDAL SNSR1” and “BRK PEDAL SNSR2” in “DATA MONITOR” mode with CONSULT-III.
3. Check “BRK PEDAL SNSR1” and “BRK PEDAL SNSR2” indication under the following conditions.
Is the inspection result normal?
YES >> GO TO 6.
NO >> GO TO 2.
2.CHECK BRAKE PEDAL STROKE SENSOR POWER SUPPLY
1. Turn ignition switch OFF.
2. Disconnect brake pedal stroke sensor harness connector.
3. Check voltage between brake pedal stroke sensor harness connector and ground.
Is the inspection result normal?
YES >> GO TO 4.
NO >> GO TO 3.
3.CHECK BRAKE PEDAL STROKE SENSOR POWER SUPPLY CIRCUIT
1. Disconnect pre-crash seat belt contro l unit (driver side) harness connector.
2. Check continuity between pre-crash seat belt c ontrol unit (driver side) harness connector and brake pedal
stroke sensor harness connector.
DTC No. Self-diagnosis item DTC Detection Condition Possible causes
B2453 BR STROKE SEN CIRC Circuit of brake pedal stroke sensor out-
put is open or shorted  Harness or connectors
(The sensor circuit is open or shorted)
 Pre-crash seat belt co ntrol unit (driver side)
 Brake pedal stroke sensor
Monitor item Condition Voltage (V)
(Approx.)
BRK PEDAL SNSR1 Brake released → depressed 1
→ 4
BRK PEDAL SNSR2 4 → 1
Brake pedal stroke sensor
GroundVoltage (V)
(Approx.)
Connector Terminal
E 111 2 5
Pre-crash seat belt control unit (driver side) Brake pedal stroke sensor Continuity
Connector Terminal Connector Terminal
B9 10 E111 2 Existed
Revision: 2010 May2011 QX56

B2453 BR STROKE SEN CIRCSBC-39
< DTC/CIRCUIT DIAGNOSIS >
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3. Check continuity between pre-crash seat belt control unit (driver side) harness connector and ground.
Is the inspection result normal?
YES >> Replace pre-crash seat belt c ontrol unit (driver side). Refer to SB-6, "SEAT BELT RETRACTOR :
Removal and Installation".
NO >> Repair or replace harness or connector.
4.CHECK BRAKE PEDAL STROKE SENSOR CIRCUIT
1. Disconnect pre-crash seat belt control unit (driver side) harness connector.
2. Check continuity between pre-crash seat belt c ontrol unit (driver side) harness connector and brake pedal
stroke sensor harness connector.
3. Check continuity between pre-crash seat belt control unit harness connector (driver side) and ground.
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair or replace harness or connector.
5.CHECK BRAKE PEDAL STROKE SENSOR
Refer to SBC-39, "
Component Inspection".
Is the inspection result normal?
YES >> GO TO 6.
NO >> Replace brake pedal stroke sensor. Refer to SBC-63, "
Removal and Installation".
6.CHECK INTERMITTENT INCIDENT
Refer to GI-40, "
Intermittent Incident".
>> INSPECTION END
Component InspectionINFOID:0000000006237905
COMPONENT PARTS INSPECTION
1.CHECK BRAKE PEDAL STROKE SENSOR
1. Turn ignition switch OFF.
2. Disconnect brake pedal stroke sensor connector.
3. Check resistance between brake pedal stroke sensor terminal as per the following.
Pre-crash seat belt control unit (driver side)
GroundContinuity
Connector Terminal
B9 10 Not existed
Pre-crash seat belt control unit (driver side) Brake pedal stroke sensor Continuity
Connector Terminal Connector Terminal
B9 2
E 111 1
Existed
12 3
17 4
Pre-crash seat belt control unit (driver side) GroundContinuity
Connector Terminal
B9 2
Not existed
12
17
Revision: 2010 May2011 QX56

B2454 SEAT BLT PWR DR CIRCSBC-41
< DTC/CIRCUIT DIAGNOSIS >
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B2454 SEAT BLT PWR DR CIRC
DTC LogicINFOID:0000000006237906
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-41, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006237907
1.CHECK FUSE
1. Turn ignition switch OFF.
2. Check 30 A fuse (No. 83).
Is the inspection result normal?
YES >> GO TO 2.
NO >> Replace the blown fuse after repairing the affected circuit if a fuse is blown.
2.CHECK PRE-CRASH SEAT BELT MOTOR POWER SUPPLY
1. Disconnect pre-crash seat belt control unit (driver side) harness connector.
2. Check voltage 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.CHECK INTERMITTENT INCIDENT
Refer to GI-40, "
Intermittent Incident".
>> INSPECTION END
DTC No. Self-diagnosis item DTC De tection Condition Possible causes
B2454 SEAT BLT PWR DR CIRC Seat belt motor (driver
side) power supply cir-
cuit is open or shorted  Harness or connectors
[Pre-crash seat belt control unit (driver
side) circuit is open or shorted]
 Pre-crash seat belt co ntrol unit (driver side)
Pre-crash seat belt control unit (driver side)
GroundVoltage (V)
Connector Terminal Battery voltage
B9 19
Revision: 2010 May2011 QX56

B2456 SEAT BLT PWR ASSBC-43
< DTC/CIRCUIT DIAGNOSIS >
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B2456 SEAT BLT PWR AS
DTC LogicINFOID:0000000006237910
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-43, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006237911
1.CHECK FUSE AND FUSIBLE LINK
1. Turn ignition switch OFF.
2. Check 30 A fuse (No.77).
Is the inspection result normal?
YES >> GO TO 2.
NO >> Replace the blown fuse after repairing the affected circuit if a fuse is blown.
2.CHECK PRE-CRASH SEAT BELT MOTOR POWER SUPPLY
1. Disconnect pre-crash seat belt contro l unit (passenger side) harness connector.
2. Check voltage between pre-crash seat belt cont rol unit (passenger side) harness connector and ground.
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair or replace harness between pre-crash seat belt control unit (passenger side) and fuse.
3.CHECK INTERMITTENT INCIDENT
Refer to GI-40, "
Intermittent Incident".
>> INSPECTION END
DTC No. Self-diagnosis item DTC Detection Condition Possible causes
B2456 SEAT BLT PWR AS
CIRC Pre-crash seat belt control unit (passenger side)
power supply circuit is open or shorted  Harness or connectors
[Pre-crash seat belt control unit (pas-
senger side) circuit is open or shorted]
 Pre-crash seat belt control unit (pas-
senger side)
Pre-crash seat belt control unit (passenger side)
GroundVoltage (V)
(Approx.)
Connector Terminal Battery voltage
B231 19
Revision: 2010 May2011 QX56

B2458 LOCAL COMMSBC-45
< DTC/CIRCUIT DIAGNOSIS >
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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-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

SBC-54
< DTC/CIRCUIT DIAGNOSIS >
SEAT BELT BUCKLE SWITCH (DRIVER SIDE)
4. Check continuity between pre-crash seat belt control unit (driver side) harness connector and ground.
Is the inspection result normal?
YES >> Replace pre-crash seat belt control unit (driver side). Refer to SB-6, "SEAT BELT RETRACTOR :
Removal and Installation".
NO >> Repair or replace harness or connector.
3.CHECK SEAT ASSEMBLY SWITCH GROUND CIRCUIT
Check continuity between seat belt assembly (driver side) and ground.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair or replace harness or connector.
4.CHECK SEAT BELT ASSEMBLY (DRIVER SIDE)
Check seat belt assembly (driver side). Refer to SBC-54, "
Component Inspection [Seat Belt Assembly (Driver
Side)]".
Is the inspection result normal?
YES >> Check intermittent incident. Refer to GI-40, "Intermittent Incident".
NO >> Replace seat belt assembly (driver side). Refer to SB-6, "
SEAT BELT RETRACTOR : Removal
and Installation".
Component Inspection [Seat Belt Assembly (Driver Side)]INFOID:0000000006237933
1.CHECK SEAT BELT ASSEMBLY (DRIVER SIDE)
1. Turn ignition switch OFF.
2. Disconnect seat belt assembly (driver side) harness connector.
3. Check continuity between seat belt assembly (driver side) terminals.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace seat belt assembly (driver side). Refer to SB-6, "
SEAT BELT RETRACTOR : Removal
and Installation".
Pre-crash seat belt control unit (driver side)
GroundContinuity
Connector Terminal
B9 6 Not existed
Seat belt assembly (driver side) GroundContinuity
Connector Terminal
B76 4 Existed
Seat belt assembly (driver side) Condition Continuity
Te r m i n a l
3 4When driver side seat belt is fastened Not existed
When driver side seat belt is not fastened Existed
5 When driver side seat belt is fastened Existed
When driver side seat belt is not fastened Not existed
Revision: 2010 May2011 QX56