2011 INFINITI QX56 turn signal

SBC-2
DTC Logic ...............................................................38
Diagnosis Procedure ..............................................38
Component Inspection ............................................39
B2454 SEAT BLT PWR DR CIRC .....................41
DTC Logic ............................................................ ...41
Diagnosis Procedure ..............................................41
B2455 CONTROL UNIT DR ..............................42
DTC Logic ............................................................ ...42
Diagnosis Procedure ..............................................42
B2456 SEAT BLT PWR AS ...............................43
DTC Logic ............................................................ ...43
Diagnosis Procedure ..............................................43
B2457 CONTROL UNIT AS ...............................44
DTC Logic ............................................................ ...44
Diagnosis Procedure ..............................................44
B2458 LOCAL COMM .......................................45
DTC Logic ............................................................ ...45
Diagnosis Procedure ..............................................45
B2461 VHCL SPEED SIGNAL ..........................47
Description ........................................................... ...47
DTC Logic ...............................................................47
Diagnosis Procedure ..............................................47
B2463 ROLLOVER SIGNAL .............................48
Description ........................................................... ...48
DTC Logic ...............................................................48
Diagnosis Procedure ..............................................48
B2466 DR/AS CONTROL UNIT ........................49
DTC Logic ............................................................ ...49
Diagnosis Procedure ..............................................49
B2470 SYS HEAT PROTC DR ..........................50
Description ........................................................... ...50
DTC Logic ...............................................................50
Diagnosis Procedure ..............................................50
B2471 SYS HEAT PROTC AS ..........................51
Description ........................................................... ...51
DTC Logic ...............................................................51
Diagnosis Procedure ............................................ ...51
POWER SUPPLY AND GROUND CIRCUIT .....52
Diagnosis Procedure ............................................ ...52
SEAT BELT BUCKLE SWITCH (DRIVER
SIDE) ..................................................................
53
Component Function Check ................................ ...53
Diagnosis Procedure ...............................................53
Component Inspection [Seat Belt Assembly (Driv-
er Side)] ..................................................................
54
SEAT BELT BUCKLE SWITCH (PASSEN-
GER SIDE) .........................................................
55
Component Function Check ................................ ...55
Diagnosis Procedure ...............................................55
Component Inspection [Seat Belt Assembly (Pas-
senger Side)] ...........................................................
56
SEAT BELT WARNING LAMP CIRCUIT ..........57
Component Function Check ................................ ...57
Diagnosis Procedure ...............................................57
Component Inspection [Seat Belt Assembly (Pas-
senger Side)] ...........................................................
58
SYMPTOM DIAGNOSIS ............................60
PRE-CRASH SEAT BELT DOSE NOT OPER-
ATE ................................................................. ...
60
Diagnosis Procedure ............................................ ...60
SEAT BELT WARNING LAMP DOES NOT
TURN OFF .........................................................
61
Diagnosis Procedure ............................................ ...61
SEAT BELT WARNING LAMP DOES NOT
TURN ON ...........................................................
62
Diagnosis Procedure ............................................ ...62
REMOVAL AND INSTALLATION ..............63
BRAKE PEDAL STROKE SENSOR .............. ...63
Exploded View ..................................................... ...63
Removal and Installation .........................................63
Revision: 2010 May2011 QX56

SBC-6
< SYSTEM DESCRIPTION >
COMPONENT PARTS
Component Description
INFOID:0000000006237876
A. View with instrument driver lower cov- er removed B. Combination switch C. View with center pillar lower garnish
removed (driver side)
D. View with center pillar lower garnish re- moved (passenger side)
Component Function
ABS actuator and electric unit (control unit) ABS operation signal is rece
ived from ABS actuator and el ectric unit (control unit)
via CAN communication.
ADAS control unit Intelligent brake assistance operation signal is received from ADAS control unit
via CAN communication.
Air bag diagnosis sensor unit  Detects a collision and supplies power supply for deployment to air bag module
and pre-tensioner seat belt.
 Performs the deploy judgement of passenger air bag based on the information from Occupant Detection System control unit
BCM Ignition ON signal, sleep/wake up signal, and door switch signal are received
from BCM via CAN communication.
Brake pedal stroke sensor  It changes voltage according to brake pedal depressed amount and sends the
signal to pre-crash seat belt control unit.
 There are 2 signals (brake pedal stroke sensor 1 and 2) sent from the brake
pedal stroke sensor. Pre-crash seat belt control unit judges the stroke amount
and the speed of the brake pedal according to the voltage of the signal sent by
each side.
Combination meter  Transmits vehicle speed signal to pre-crash seat belt control unit (driver side).
 Turns the seat belt warning lamp ON when the seat belt is unfastened.
Occupant detection system control unit Judges the passenger seat condition based on the information from occupant de-
tection unit.
Pre-crush seat belt control unit (driver side)  Total control of pre-crash seat belt system is operated according to transmit sig-
nal.
 Driver seat belt retractor integrates pre-crash seat belt control unit (driver side), driver seat belt motor, and tension reducer.
 Seat belt motor operates each operation of pull, return, and hold.
Pre-crush seat belt control unit (passenger side)  Control of passenger pre-crash seat belt is operated according to transmit sig-
nal.
 Passenger seat belt retractor integrates pre-crash seat belt control unit (driver seat), driver seat belt motor, and tension reducer.
 Seat belt motor operates each operation of pull, return, and hold.
Seat belt buckle switch (driver side)  Fastening or not fastening of seat belt is judged. This judgment is used for con-
trol of driver pre-crash seat belt system.
 Seat belt warning lamp on combination meter turns ON when seat belt is not fastened while ignition switch is ON.
 The seat belt buckle switch is installed in the seat belt buckle.
Seat belt buckle switch (passenger side)  Fastening or not fastening of seat belt is judged. This judgment is used to con-
trol passenger pre-crash seat belt system.
 The seat belt buckle switch is installed in the seat belt buckle.
Steering angle sensor Steering angle sensor signal, steering angle speed signal, steering angle sensor
neutral position adjustment completion signal, and steering angle sensor mal-
function signal are received via CAN communication.
Revision: 2010 May2011 QX56

SYSTEMSBC-9
< SYSTEM DESCRIPTION >
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PRE-CRASH SEAT BELT SYSTEM : Fail SafeINFOID:0000000006237879
 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.
*1: The deactivation mode differs depending on the internal malfunctioning condition of control unit 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
 A part of comfort function
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
 A part of comfort function
U1000 CAN communication circuit Stops the operation in the conditions as per the following. *
1
 During emergency brake operation
 When ABS continuously 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
B2451 SEAT BLT MTR DR CIRC Fully deactivates the whole operation.
B2452 SEAT BLT MTR AS CIRC Deactivate s a part of comfort function.
B2453 BR_STROKE_SEN_CIRC Stops the operation in the conditions as per the following.
 During emergency brake operation
 When ABS continuously operates
 A part of comfort function
B2454 SEAT BLT PWR DR CIRC Fully deactivates the whole operation.
B2455 CONTROL UNIT DR Stops the operation in the conditions as per the following. *
1
 During emergency brake operation
 When ABS continuously 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 Deactivates a part of comfort function.
B2457 CONTROL UNIT AS Deactivates a part of comfort function.
B2458 LOCAL COMM Deactivates a part of comfort function.
B2461 VHCL SPEED SIGNAL Stops the operation in the conditions as per the following.
 During emergency brake operation
 When ABS continuously operates
 When lateral slippage during cornering occurs
 When steering wheel is rotated for emergency
 When the vehicle inclined excessively
 When comfort function operates
B2463 ROLLOVER SIGNAL Stops the operation in the conditions as per the following.
 When the vehicle inclined excessively
 A part or the whole comfort function
B2466 DR/AS CONTROL UNIT Deactivates a part of comfort function.
B2470 SYS HEAT PROTC DR  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
Revision: 2010 May2011 QX56

SBC-14
< ECU DIAGNOSIS INFORMATION >
PRE-CRASH SEAT BELT CONTROL UNIT (DRIVER SIDE)
TERMINAL LAYOUT
PHYSICAL VALUES
Fail SafeINFOID:0000000006237884
 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 normal 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
2
(G) Ground Brake pedal stroke sensor signal 1 Input Brake released
→ depressed 1 V - 4 V
4
(P) Ground CAN-L Input/
Output ——
6
(LG/R) 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 Output IGN ON 5 V
9
(–) Ground Shield — — —
10
(R) Ground Brake pedal stroke sensor power circuit Output IGN ON 5 V
12
(B) Ground Brake pedal stroke sensor signal 2 Input Brake released
→ depressed 4 V - 1 V
14
(L) Ground CAN-H Input/
Output ——
16
(W) Ground Local Communication Line 1 Input/
Output ——
17
(W) Ground Brake pedal stroke sensor ground circuit — — 0 V
18
(B) Ground Ground — — 0 V
19
(W) Ground Motor drive circuit power supply Input — Battery voltage
20
(B) Ground Motor drive circuit ground — — 0 V
Revision: 2010 May2011 QX56

PRE-CRASH SEAT BELT CONTROL UNIT (DRIVER SIDE)SBC-15
< ECU DIAGNOSIS INFORMATION >
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*1: The deactivation mode differs depending on the internal malfunctioning condition of control unit 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
 A part of comfort function
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
 A part of comfort function
U1000 CAN communication circuit Stops the operation in the conditions as per the following. *
1
 During emergency brake operation
 When ABS continuously 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
B2451 SEAT BLT MTR DR CIRC Fully deactivates the whole operation.
B2452 SEAT BLT MTR AS CIRC Deactivate s a part of comfort function.
B2453 BR_STROKE_SEN_CIRC Stops the operation in the conditions as per the following.
 During emergency brake operation
 When ABS continuously operates
 A part of comfort function
B2454 SEAT BLT PWR DR CIRC Fully deactivates the whole operation.
B2455 CONTROL UNIT DR Stops the operation in the conditions as per the following. *
1
 During emergency brake operation
 When ABS continuously 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 Deactivates a part of comfort function.
B2457 CONTROL UNIT AS Deactivates a part of comfort function.
B2458 LOCAL COMM Deactivates a part of comfort function.
B2461 VHCL SPEED SIGNAL Stops the operation in the conditions as per the following.
 During emergency brake operation
 When ABS continuously operates
 When lateral slippage during cornering occurs
 When steering wheel is rotated for emergency
 When the vehicle inclined excessively
 When comfort function operates
B2463 ROLLOVER SIGNAL Stops the operation in the conditions as per the following.
 When the vehicle inclined excessively
 A part or the whole comfort function
B2466 DR/AS CONTROL UNIT Deactivates a part of comfort function.
B2470 SYS HEAT PROTC DR  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
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