Infiniti QX56 (Z62). Manual — part 1076
SBC-4
< PRECAUTION >
PRECAUTIONS
• The seat belt was in use at the time of a collision (except for minor collisions and the belts, retractors and
buckles show no damage and continue to operate properly).
• The seat belt was damaged in an accident. (i.e. torn webbing, bent retractor or guide).
• The seat belt attaching point was damaged in an accident. Inspect the seat belt attaching area for damage
or distortion and repair as necessary before installing a new seat belt assembly.
• Anchor bolts are deformed or worn out.
• The seat belt pre-tensioner should be replaced even if the seat belts are not in use during the collision in
which the air bags are deployed.
COMPONENT PARTS
SBC-5
< SYSTEM DESCRIPTION >
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SBC
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SYSTEM DESCRIPTION
COMPONENT PARTS
Component Parts Location
INFOID:0000000006237875
1.
SYSTEM : Component Parts Loca-
tion"
2.
Combination meter
Refer to
.
3.
ABS actuator and electric unit (con-
trol unit)
Refer to
4.
Brake pedal stroke sensor
5.
Steering angle sensor Pre-crash
6.
Pre-crash seat belt control unit (driver
side)
7.
.
8.
Air bag diagnosis sensor unit
Refer to
9.
Seat belt control unit (passenger
side)
10.
Seat belt buckle switch
JMHIA1582ZZ
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 received from ABS actuator and electric 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.
SYSTEM
SBC-7
< SYSTEM DESCRIPTION >
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SYSTEM
PRE-CRASH SEAT BELT SYSTEM
PRE-CRASH SEAT BELT SYSTEM : System Diagram
INFOID:0000000006237877
PRE-CRASH SEAT BELT SYSTEM : System Description
INFOID:0000000006237878
• Pre-crash seat belt system integrates control unit and motor in driver and passenger seat belt retractors.
• Provides a sense of ease when pre-crash seat belt control unit judges the emergency braking operation, the
intelligent brake assistance operating status, the continuous ABS operating status, the emergency steering
wheel operation, the excessive vehicle inclination status, or the lateral slippage status during cornering.
The motor immediately retracts the seat belt and suppresses change in occupant posture.
• Even in a situation where a collision is unavoidable, effects of other safety devices, like the air bag, are max-
imized and damages are reduced.
• Motor retracts seat belt when unfastening and extracts seat belt when fastening to reduce the feeling of
pressure. (comfort function)
FUNCTION DESCRIPTION
Pre-crash seat belt system operates under the following conditions.
• During emergency brake operation
• When ABS continuously operates
• When intelligent brake assistance operates
• When lateral slippage during cornering occurs
• When steering wheel is rotated for emergency
JMHIA1565GB
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