Infiniti M35/M45 Y50. Manual — part 1033
PRE-CRASH SEAT BELT
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PRE-CRASH SEAT BELT
PFP:98845
Component Parts and Harness Connector Location
NHS0007X
System Description
NHS0007Y
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Pre-crash seat belt system is adapted to front seat belts RH/LH.
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When the pre-crash seat belt control unit judges the emergency braking operation, it gives the sense of
security by the motor built into the pre-crash seat belt retracting the shoulder belt and suppressing the
crew's posture change. Also, it eases the damage of the collision.
PHIA1123E
1.
Fuse block (J/B)
2.
Fuse, fusible link and relay block
(J/B)
3.
Pre-crash seat belt control unit B142
(View with the trunk side finisher LH
removed)
4.
Brake pedal stroke sensor E125
(View with the instrument driver
lower panel removed)
5.
Pre-crash seat belt motor B32 (LH),
B422 (RH)
(View with the center pillar lower
garnish removed)
6.
Seat belt buckle switch B203 (driver
seat) B253 (passenger seat)
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PRE-CRASH SEAT BELT
FUNCTION DESCRIPTION
Operation condition
Pre-crash seat belt operates under the following conditions.
Operation prohibition condition
If operation condition is satisfied, pre-crash seat belt does not operate under the following conditions.
*
1
: When pre-crash seat belt doesn't operate after it continuously operates 3 times or more, operation can be performed again by stop-
ping operation for approximately 7 minutes.
*
2
for details of fail-safe mode.
FAIL-SAFE MODE
When a malfunction occurs in the following system, the pre-crash seat belt function is controlled according to
the malfunctioning parts.
Also, seat belt warning lamp blinks with fastening driver seat belt when the following malfunction occurs.
Seat Belt Warning Lamp Illumination Pattern
NOTE:
The seat belt warning lamp illumination system shown above operates only when the air bag system does not
turn on the seat belt warning lamp. The air bag system turns on the seat belt warning lamp, depending on the
conditions of passenger being on and the passenger seat belt fastening.
Condition
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When the brake pedal is depressed more than a certain extent
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When operation prohibition condition is not satisfied
Condition
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When seat belt is not fastened (Only the seat belt that is not fastened does not operate.)
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When vehicle is moving backwards
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When the vehicle speed is 15 km/h (9 MPH) or less
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When pre-crash seat belt continuously operates 3 times or more *
1
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At fail-safe condition *
2
Malfunctioning parts
Control contents
Brake pedal stroke sensor system malfunction
Pre-crash seat belt RH/LH do not activate when emergency brake operates.
Seat belt motor RH malfunction
Pre-crash seat belt RH does not activate.
Seat belt motor LH malfunction
Pre-crash seat belt LH does not activate.
Motor power supply circuit malfunction
Pre-crash seat belt RH/LH do not activate.
PHIA1142E
PRE-CRASH SEAT BELT
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CAN Communication System Description
NHS0007Z
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CAN communication, control units are connected with 2
communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads required data only.
CAN Communication Unit
NHS00080
Refer to
LAN-50, "CAN System Specification Chart"
.
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PRE-CRASH SEAT BELT
Schematic
NHS00081
THWT0139E
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