display INFINITI QX56 2011 Factory Service Manual

SBC-16
< ECU DIAGNOSIS INFORMATION >
PRE-CRASH SEAT BELT CONTROL UNIT (DRIVER SIDE)
DTC Index
INFOID:0000000006237885
DTC Trouble diagnosis name
(CONSULT-III display) DTC detection condition Reference
U0126 STRG ANG SEN SIG Steering angle sensor malfunction is received SBC-33
U0428 STRG ANGL CAL Steering angle sensor calibration incomplete signal is receivedSBC-34
U1000 CAN COMM CIRCUITPre-crash seat belt control unit cannot transmit and receive CAN
communication signal for 2 seconds or more SBC-35
B2451 SEAT BLT MTR DR CIRC Motor or control unit malfunction
 Seat belt motor circuit is open or shorted
SBC-36
B2452 SEAT BLT MTR AS CIRC Motor or control unit malfunction
 Seat belt motor circuit is open or shorted SBC-37
B2453 BR_STROKE_SEN_CIRC
 Brake pedal stroke sensor malfunction
 Brake pedal stroke sensor circuit is open or shorted SBC-38
B2454 SEAT BLT PWR DR CIRC Motor power su
pply circuit is open or shortedSBC-41
B2455 CONTROL UNIT DR Malfunction in pre-crash seat belt control unit SBC-42
B2456 SEAT BLT PWR AS CIRC Motor power supply circuit is open or shortedSBC-43
B2457 CONTROL UNIT AS Malfunction in pre-crash seat belt control unit SBC-44
B2458 LOCAL COMM Local communication line open or shortedSBC-45
B2461 VHCL SPEED SIGNAL Vehicle speed signal malfunction is received SBC-47
B2463 ROLLOVER SIGNAL Rollover signal malfunction is received SBC-48
B2466 DR/AS CONTROL UNIT Control unit is out of the vehicle specificationSBC-49
B2470 SYS HEAT PROTC DRDeactivation for cooling to prevent system heating due to continuous
operation SBC-50
B2471 SYS HEAT PROTC ASDeactivation for cooling to prevent system heating due to continuous
operation
SBC-51
Revision: 2010 May2011 QX56

PRE-CRASH SEAT BELT CONTROL UNIT (PASSENGER SIDE)
SBC-17
< ECU DIAGNOSIS INFORMATION >
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PRE-CRASH SEAT BELT CONTROL UNIT (PASSENGER SIDE)
Reference ValueINFOID:0000000006237886
TERMINAL LAYOUT
PHYSICAL VALUES
Fail SafeINFOID:0000000006237887
 When a system malfunction is detected, deactivates a part of the system or all functions depending on the
malfunctioning part.
 When the malfunction condition recovers to the norma l condition, the system returns to the normal opera-
tion.
JMHIA0711ZZ
Te r m i n a l N o .
(Wire color) Description
ConditionVa l u e
(Approx.)
+ – Signal name Input/
Output
1
(Y) Ground Power supply Input — Battery voltage
6
(LG/B) Ground Seat belt buckle switch signal Input Seat belt is fastened 0 V
Seat belt is unfastened 5 V
8
(G) Ground Local Communication Line 2 Input/
Output IGN ON 5 V
9
(–) Ground Shield — — —
16
(W) Ground Local Communication Line 1
Input/
Output ——
18
(B) Ground Ground — — 0 V
19
(W) Ground Motor passenger circuit power supply Input — Battery voltage
20
(B) Ground Motor passenger circuit ground — — 0 V
Display contents of CONSULT-III Fail-safe
U0126 STRG ANG SEN SIG Stops the operation in the conditions as per the following.
 When lateral slippage during cornering occurs
 When steering wheel is rotated for emergency
U0428 STRG ANGL CAL Stops the operation in the conditions as per the following.
 When lateral slippage during cornering occurs
 When steering wheel is rotated for emergency
Revision: 2010 May2011 QX56

SBC-18
< ECU DIAGNOSIS INFORMATION >
PRE-CRASH SEAT BELT CONTROL UNIT (PASSENGER SIDE)
*1: The deactivation mode differs depending on the internal malfunctioning condition of control unit
U1000 CAN communication circuit
Stops the operation in the conditions as per the following. *
1
 During emergency brake operation
 When ABS continuo
usly operates
 When lateral slippage during cornering occurs
 When Intelligent brake assistance operates
 When steering wheel is rotated for emergency
 When the vehicle inclined excessively
 A part or the whole comfort function
B2452 SEAT BLT MTR AS CIRC Fully deactivates the whole operation.
B2453 BR_STROKE_SEN_CIRC Stops the operation in the conditions as per the following.
 During emergency brake operation
 When ABS continuo
usly operates
B2455 CONTROL UNIT DR Stops the operation in the conditions as per the following. *
1
 During emergency brake operation
 When ABS continuo
usly operates
 When lateral slippage during cornering occurs
 When Intelligent brake assistance operates
 When steering wheel is rotated for emergency
 When the vehicle inclined excessively
 A part or the whole comfort function
B2456 SEAT BLT PWR AS Fully deactivates the whole operation.
B2457 CONTROL UNIT AS Fully deactivates the whole operation.*
1
B2458 LOCAL COMM
Fully deactivates the whole operation.*1
B2461 VHCL SPEED SIGNALStops the operation in the conditions as per the following.
 During emergency brake operation
 When ABS continuo
usly operates
 When lateral slippage during cornering occurs
 When steering wheel is rotated for emergency
 When the vehicle inclined excessively
 A part or the whole comfort function
B2463 ROLLOVER SIGNAL When the vehicle inclined excessively
B2466 DR/AS CONTROL UNIT Stops the operation in the conditions as per the following.
 During emergency brake operation
 When ABS continuo
usly operates
 When lateral slippage during cornering occurs
 When steering wheel is rotated for emergency
 When the vehicle inclined excessively
 A part or the whole comfort function
B2471 SYS HEAT PROTC AS  Fully deactivates the whole operation.
 Operation return
- 1 time operation becomes possible after approximately 30 seconds
- Returns to the initial condition after approximately 8 minutes
Display contents of CONSULT-III Fail-safe
Revision: 2010 May2011 QX56

U0126 ST ANG SEN SIGSBC-33
< DTC/CIRCUIT DIAGNOSIS >
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DTC/CIRCUIT DIAGNOSIS
U0126 ST ANG SEN SIG
DescriptionINFOID:0000000006237891
Inputs the steering angle signal from steering angle sensor via CAN communication.
DTC LogicINFOID:0000000006237892
DTC DETECTION LOGIC
NOTE:
If DTC U0126 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-33, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006237893
1.CHECK DTC WITH “ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)”
Check “Self-diagnostic result” for “ABS” with CONSULT-III. Refer to BRC-40, "
CONSULT-III Function".
Is DTC detected?
YES >> Repair or replace malfunctioning parts.
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
U0126 ST ANG SEN SIG Receipt of a malfunction signal of Steering angle signal Steering angle sensor
Revision: 2010 May2011 QX56

SBC-34
< DTC/CIRCUIT DIAGNOSIS >
U0428 STRG ANGL CAL
U0428 STRG ANGL CAL
DescriptionINFOID:0000000006237894
Inputs the steering calibration incomplete signal from steering angle sensor via CAN communication.
DTC LogicINFOID:0000000006237895
DTC DETECTION LOGIC
NOTE:
If DTC U0428 is displayed with DTC U0126, first perform the trouble diagnosis for DTC U0126. Refer to SBC-
33, "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-34, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006237896
1.CHECK DTC WITH “ABS ACTUATOR A ND ELECTRIC UNIT (CONTROL UNIT)”
Check “Self-diagnostic result” for “ABS” with CONSULT-III. Refer to BRC-40, "
CONSULT-III Function".
Is DTC detected?
YES >> Repair or replace malfunctioning parts.
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
U0428 STRG ANGL CAL Receipt of the calibration incomplete signal Steering angle sensor calibration incomplete
Revision: 2010 May2011 QX56

SBC-36
< DTC/CIRCUIT DIAGNOSIS >
B2451 SEAT BLT MTR DR CIRC
B2451 SEAT BLT MTR DR CIRC
DTC LogicINFOID:0000000006237899
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-36, "Diagnosis Procedure".
NO >> Driver side pre-crash seat belt motor system is normal.
Diagnosis ProcedureINFOID:0000000006237900
1.INSPECTION START
1. Check “Self-diagnostic result” with CONSULT-III.
2. Touch “ERASE”.
3. Perform DTC Confirmation Procedure. Refer to SBC-36, "
DTC Logic".
Is DTC B2451 displayed again?
YES >> Replace pre-crash seat belt control unit (driver side). Refer to SB-6, "SEAT BELT RETRACTOR :
Removal and Installation".
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
B2451 SEAT BLT MTR DR CIRC Circuit of seat belt
motor (driver side) is
open or shorted Pre-crash seat belt control unit (driver side)
Revision: 2010 May2011 QX56

B2452 SEAT BLT MTR AS CIRCSBC-37
< DTC/CIRCUIT DIAGNOSIS >
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B2452 SEAT BLT MTR AS CIRC
DTC LogicINFOID:0000000006237901
DTC DETECTION LOGIC
DTC REPRODUCTION 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-37, "Diagnosis Procedure".
NO >> Passenger side pre-crash seat belt motor system is normal.
Diagnosis ProcedureINFOID:0000000006237902
1.INSPECTION START
1. Check “Self-diagnostic result” with CONSULT-III.
2. Touch “ERASE”.
3. Perform DTC Confirmation Procedure. Refer to SBC-37, "
DTC Logic".
Is DTC B2452 displayed again?
YES >> Replace pre-crash seat belt control unit (passenger side). Refer to SB-6, "SEAT BELT RETRAC-
TOR : Removal and Installation".
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
B2452 SEAT BLT MTR AS CIRC Circuit of seat belt motor (passenger side)
is open or shorted Pre-crash seat belt control unit (passenger
side)
Revision: 2010 May2011 QX56

SBC-42
< DTC/CIRCUIT DIAGNOSIS >
B2455 CONTROL UNIT DR
B2455 CONTROL UNIT DR
DTC LogicINFOID:0000000006237908
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-42, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006237909
1..INSPECTION START
1. Check “Self-diagnostic result” with CONSULT-III.
2. Touch “ERASE”.
3. Perform DTC Confirmation Procedure. See SBC-42, "
DTC Logic".
Is DTC B2455 displayed again?
YES >> Replace pre-crash seat belt control unit (driver 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
B2455 CONTROL UNIT DR Pre-crash seat belt control unit (driver side) inter-
nal circuit malfunction Pre-crash seat belt control unit (driver side)
Revision: 2010 May2011 QX56

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

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