Infiniti QX56 (Z62). Manual - part 1076

 

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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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SYSTEM DESCRIPTION

COMPONENT PARTS

Component Parts Location

INFOID:0000000006237875

1.

BCM
Refer to 

BCS-4, "BODY CONTROL 

SYSTEM : Component Parts Loca-
tion"

.

2.

Combination meter
Refer to 

MWI-6, "METER SYSTEM : 

Component Parts Location"

.

3.

ABS actuator and electric unit (con-
trol unit)
Refer to 

BRC-149, "Component 

Parts Location"

.

4.

Brake pedal stroke sensor

5.

Steering angle sensor Pre-crash

6.

Pre-crash seat belt control unit (driver 
side)

7.

ADAS control unit
Refer to 

DAS-13, "Component Parts 

Location"

.

8.

Air bag diagnosis sensor unit
Refer to 

SRC-8, "Component Parts 

Location"

.

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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