Infiniti QX56 (Z62). Manual - part 1077

SBC-8

< SYSTEM DESCRIPTION >

SYSTEM

• When the vehicle inclined excessively
• When comfort function operates

OPERATION CONDITION

Operation while driving
• Operation start and stop conditions of pre-crash seat belt system are as shown in the following table.
• The activation and deactivation conditions of pre-crush seat belt are as per the following.

NOTE:
For details of intelligent brake assist system.Refer to

BRC-152, "INTELLIGENT BRAKE ASSIST : System

Description"

Comfort function

• Seat belt is retracted and the looseness is reduced in the state as shown in the following table.
• Operation start and stop conditions of pre-crash seat belt system are as shown in the following table.

Operation Prohibition Condition

Pre-crash seat belt system does not operate in the following conditions.
• When seat belt is not fastened (only the seat belt that is not fastened does not operate)
• When motor is overheat due to contentious operation*1
• When the system is in fail-safe mode

*1: System operation is temporarily deactivated to avoid overheating, when comfort function is continuously
operated (18 times or more) during a short period of time by fastening and unfastening seat belts or opening
and closing doors.

MALFUNCTION WARNING

When system malfunction is detected, comfort function is deactivated to warn customer of system malfunc-
tion.

Operation item

Operation start condition

Operation stop condition

During emergency brake operation

• Vehicle speed is 15 km/h (9 MPH) or more
• Emergency braking status is detected

• During acceleration
• When stopped

When ABS continuously operates

• ABS continuously operates for 2 seconds or

• Brake pedal is in depressed state

When intelligent brake assistance oper-
ates

System detects that intelligent brake assistance is
in operating status

2 seconds after operation start

When lateral slippage during cornering
occurs

• Vehicle speed is 30 km/h (19 MPH) or more
• System detects that the vehicle is in lateral slip-

page state

• System detects that the vehicle is driving on a

curve

• Vehicle stopped
• 1 second or more after maintaining

steering wheel angle in straight driv-
ing state

When steering wheel is rotated for emer-
gency

• Vehicle speed is 60 km/h (36 MPH) or more
• Steering wheel angle is 90 degrees or more
• System detects that steering wheel is rotated for

emergency

When the vehicle inclined excessively

• Vehicle speed is 30 km/h (19 MPH) or more
• System detects that the vehicle inclined exces-

sively

• During acceleration
• Vehicle stopped

Operation item

Activating condition

Deactivating condition

Door open

• Seat belt is in not fastened state
• Door is operated to open from closed
• Vehicle stopped

• Seat belt retract is complete
• 13 seconds after start retracting

Seat belt is fastened

• When door is closed
• Seat belt is fastened

• Seat belt is unfastened
• 1 second after operation

Seat belt is release

Seat belt is unfastened

• Seat belt retract is complete
• 10 seconds after start retracting

SYSTEM

SBC-9

< SYSTEM DESCRIPTION >

SBC

PRE-CRASH SEAT BELT SYSTEM : Fail Safe

INFOID: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 normal condition, the system returns to the normal opera-

tion.

: 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. *

• 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

Deactivates 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. *

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

SBC-10

< SYSTEM DESCRIPTION >

SYSTEM

SEAT BELT WARNING LAMP SYSTEM

SEAT BELT WARNING LAMP SYSTEM : System Diagram

INFOID:0000000006237880

SEAT BELT WARNING LAMP SYSTEM : System Description

INFOID:0000000006237881

• Turns ON seat belt warning lamp, when the Occupant Detection System judges adult or child in the front

passenger seat and the passenger seat belt buckle switch is OFF.

• Operation of air bag diagnosis sensor unit when air bag diagnosis sensor unit receives information from

Occupant Detection System.

• In addition, seat belt warning lamp illuminates, when the driver side seat belt is not fasten. This does not

relate to the air bag diagnosis sensor unit.

• For driver seat belt function, refer to

MWI-16, "MASTER WARNING LAMP : System Diagram"

JMHIA0685GB

Status (front passenger seat)

Seat belt warning lamp (When front passenger seat is unbuck-
led)

Empty

OFF

An object

OFF

Child/ child-seat

Adult

Malfunction

OFF

Zero point reset
Not yet performed (service parts only)

OFF

DIAGNOSIS SYSTEM (PRE-CRASH SEAT BELT)

SBC-11

< SYSTEM DESCRIPTION >

SBC

DIAGNOSIS SYSTEM (PRE-CRASH SEAT BELT)

CONSULT-III Function

INFOID:0000000006237882

Diagnosis for pre-crash seat belt system can be performed using CONSULT-III.

APPLICATION ITEM

SELF-DIAGNOSIS RESULTS

Refer to

SBC-16, "DTC Index"

CAUTION:

When malfunctions are detected in several systems, including CAN communication [U1000], trouble-
shoot CAN communication [U1000].
A malfunction of system may be displayed when battery voltage is low (when 7 to 8 V is continued for
approximately 2 seconds) even though the system is not malfunctioning. Erase DTC memory and
never replace any parts after making sure that the system is normal, especially if the malfunctions are
displayed after replacing battery.

ERASING SELF-DIAGNOSIS RESULTS

• SELF-DIAGNOSIS RESULTS

Current “SELF-DIAG RESULTS” are displayed. (If all suspect circuits have been repaired, “NO DTC” is dis-
played.)

DATA MONITOR

Part to be diagnosed

Diagnosis Mode

Function description

Pre-crash seat belt

Self-diagnosis Results

• Displays data recorded when a malfunction is de-

tected.

• Erases DTC recorded in memory.

Data Monitor

Displays input data for pre-crash seat belt control
unit in real time.

Work Support

Changes the setting for each system function.

CAN DIAG SUPPORT MNTR

Monitors communication status of CAN communi-
cation.

Ecu Identification

Displays pre-crash seat belt control unit part num-
ber.

Monitor item

Contents

BUCKLE SW RH

Indicates [ON/OFF] condition of seat belt buckle switch (RH).

BUCKLE SW LH

Indicates [ON/OFF] condition of seat belt buckle switch (LH).

VEHICLE DISTANCE

Indicates [ON/OFF] condition of intelligent brake assist signal.

IGN SW

Indicates [ON/OFF] condition of ignition switch.

FR DOOR SW RH

Indicates [Close/Open] condition of front door switch (RH).

FR DOOR SW LH

Indicates [Close/Open] condition of front door switch (LH).

ABS ACTIVATING

Indicates [ON/OFF] condition of ABS operation signal.

VHCL SPEED

Indicates [Km/h] vehicle speed signal.

BRK PEDAL SNSR1

Indicates [V] voltage of brake pedal stroke sensor 1 signal.

BRK PEDAL SNSR2

Indicates [V] voltage of brake pedal stroke sensor 2 signal.

STRG ANGLE

Indicates [deg] steering angle signal.

STRG ANGLE SPEED

Indicates [deg/s] steering angle speed signal.

INCLINATION JDMT

Indicates [ON/OFF] condition of pre roll over signal.

PRE-TEN ACTIVTN

Indicates [ON/OFF] condition of pre-tensioner operated signal.

HEAT PROTC RH

Indicates [ON/OFF] condition of heat protection (RH).

HEAT PROTC LH

Indicates [ON/OFF] condition of heat protection (LH).

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