Infiniti G37 Coupe. Manual — part 1075
SBC-8
< FUNCTION DIAGNOSIS >
PRE-CRASH SEAT BELT SYSTEM
PRE-CRASH SEAT BELT SYSTEM
System Diagram
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System Description
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• Pre-crash seat belt has been adopted to RH/LH seat belts.
• When the pre-crash seat belt control unit judges the emergency braking operation, the motor built into the
pre-crash seat belt retract the shoulder belt to protect the passenger in case of collision, also give a sense of
security.
FUNCTION DESCRIPTION
Operation Condition
• Pre-crash seat belt operates under the following conditions.
Operation Prohibition Condition
• Pre-crash seat belt does not operate under the following conditions.
*
1
: When pre-crash seat belt does not operate after it continuously operates 3 times or more, operation can be performed again by stop-
ping operation for approximately 7 minutes.
*
2
: Refer to
for details of fail-safe mode.
JMHIA0430GB
Condition
• During emergency brake operation
• When operation prohibition condition is not satisfied
Condition
• When seat belt is not fastened (Only the seat belt that is not fastened does not operate)
• When the vehicle speed is 15 km/h or less
• When pre-crash seat belt continuously operates 3 times or more *
1
• At fail-safe condition *
2
PRE-CRASH SEAT BELT SYSTEM
SBC-9
< FUNCTION DIAGNOSIS >
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Refer to
for details of operation condition.
JMHIA0431GB
SBC-10
< FUNCTION DIAGNOSIS >
PRE-CRASH SEAT BELT SYSTEM
Component Parts Location
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Component Description
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1.
Battery
2.
30A (F/L-G)
3.
Pre-crash seat belt control unit
4.
Brake pedal stroke sensor
5.
Brake pedal
6.
Accelerator pedal
7.
Seat belt pre-tensioner
8.
Seat belt buckle
9.
Seat belt buckle switch
A.
Back side of glove box
B.
Back of driver instrument panel (low-
er)
C.
Brake pedal stroke sensor connector
D.
Back of center pillar lower garnish
E.
Seat belt pre-tensioner connector
JMHIA0432ZZ
Component
Function
Pre-crash seat belt control unit
It controls pre-crash seat belt motor according to input signal.
Pre-crash seat belt motor
(Seat belt motor [RH/LH])
It is built into seat belt retractor, and it pulls, returns, and maintains according to
the motor rotation.
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 will judge the stroke
amount and the speed of the brake pedal according to the voltage of the signal
sent by each side.
Seat belt buckle switch
It is arranged in the seat belt buckle and judges whether the seat belt is fastened
or not fastened.
CAN system: Unified meter and A/C amp
It transmits the vehicle status to pre-crash seat belt control unit using the CAN
communication system.
ON BOARD DIAGNOSTIC (OBD) SYSTEM
SBC-11
< FUNCTION DIAGNOSIS >
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ON BOARD DIAGNOSTIC (OBD) SYSTEM
Diagnosis Description
INFOID:0000000001711972
HOW TO DIAGNOSE
• Diagnosis for pre-crash seat belt system can be performed using CONSULT-III electronic diagnostic tester.
• Diagnosis allows technicians to detect and analyze circuits that return errors.
• Diagnostic modes of CONSULT-III are.
DIAGNOSIS PROCEDURE
Follow the diagnosis procedure to check. Refer to
.
DIAGNOSIS ITEM
• Communication
• LH/RH seat belt motor
• Brake pedal sensor
• Motor power supply
• Pre-crash seat belt control unit
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.)
• SELF-DIAG RESULTS [MEMORY]
Resume trouble diagnosis item selection screen, confirm “SELF-DIAG RESULTS”, and then touch ERASE
MEMORY.
CONSULT-III Function
INFOID:0000000001711973
“SELF-DIAG RESULTS”, “DATA MONITOR”, “CAN DIAG SUPPORT MNTR”, “C/U PART NO” of pre-crash
seat belt system can be checked by combining communications between CONSULT-III (data reception and
command transmission).
SELF-DIAGNOSIS RESULTS
Check self-diagnosis results.
CAUTION:
When malfunctions are detected in several systems, including the CAN communication [U1000], trou-
bleshoot the CAN communication [U1000].
Self-diagnosis mode
Inspection
SELF-DIAGNOSIS
RESULTS
×
×
DATA MONITOR
×
×
Part to be diagnosed
Inspection Item, Diagnosis
Mode
Description
Refer to
Pre-crash seat belt
SELF-DIAGNOSIS RESULTS
• Displays names of freeze frame data and
basic inspection stored in ECM.
• Displays data recorded when a malfunction
is detected.
• Can print out the display.
• Erases DTCs recorded in memory.
DATA MONITOR
• Displays input data for pre-crash seat belt
control unit in real time.
CAN DIAG SUPPORT MNTR
• Monitors communication status of CAN
communication.
ECU PART NUMBER
• Displays pre-crash seat belt control unit
part number.
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