Nissan Murano Z51. Manual — part 1310
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< SYSTEM DESCRIPTION >
[FOR USA AND CANADA]
SRS AIR BAG SYSTEM
SYSTEM DESCRIPTION
SRS AIR BAG SYSTEM
System Diagram
INFOID:0000000005513476
System Description
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Supplemental Restraint System (SRS) activates air bag module and seal belt pre-tensioner when it detects a
frontal collision or a side collision that is more than the specified limit. Together with other safety devices, it
reduces the impact that occupant receives when vehicle collision occurs.
Air bag sensor unit supplies power supply to air bag module and pre-tensioner seat belt when deceleration
that is more than the specified limit is detected by G sensor in air bag diagnosis sensor unit, crash zone sen-
sor, or satellite sensor. Air bag module is composed of electric igniter (squib), filter, pyrotechnic material, and
gas generating material. When air bag module receives a signal from air bag sensor unit, air bag module
ignites pyrotechnic material using electric igniter (squib) so that gas generating material generates high tem-
perature nitrogen gas. The gas through filter activates air bag and seat belt pre-tensioner.
AIR BAG DIAGNOSIS SENSOR UNIT FUNCTIONS
Air bag diagnosis sensor unit has the following functions.
• Detects a collision and supplies the energy for deploying air bag and seat belt pre-tensioner.
• Detects and records electrical malfunction in air bag system and seat belt pre-tensioner system, and blinking
air bag warning lamp.
• Detects and records the deployment of air bag and seat belt pre-tensioner, and turns ON air bag warning
lamp.
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SRS AIR BAG SYSTEM
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< SYSTEM DESCRIPTION >
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• Indicates malfunctioning portion via the number of blinks from the air bag warning lamp in the diagnosis
mode.
• Indicates the malfunction record via CONSULT-III.
• Suppresses the deployment of passenger air bag when passenger seat is empty or occupied by child or
child-seat.
• When passenger seat is occupied by child or child seat, turns ON passenger air bag OFF indicator.
• When judges that passenger seat is occupied by a adult or a child and passenger seat belt is not fasten,
turns ON seat belt warning lamp. Further information for the seat belt warning system, refer to
.
COLLISION MODES
The operation of SRS is different depending on the collision modes applications. For example, the driver air
bag module, passenger air bag module, and seat belt pre-tensioner are activated in a frontal collision but not
in a side collision.
SRS configurations that are activated for the following collision modes.
×
: Apply —: Not apply
Component Parts Location
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Collision Mode
Driver air
bag mod-
ule
Front pas-
senger air
bag mod-
ule
Front LH
seat belt
pre-ten-
sioner
Front RH
seat belt
pre-ten-
sioner
Front LH-
side air
bag mod-
ule
Front RH
side air
bag mod-
ule
LH side
curtain air
bag mod-
ule
RH side
curtain air
bag mod-
ule
Frontal collision
×
×
×
×
—
—
—
—
Left side collision
—
—
—
—
×
—
×
—
Right side collision
—
—
—
—
—
×
—
×
1.
Front passenger air bag module
2.
Driver air bag module
3.
Combination switch (Spiral cable)
4.
Front passenger air bag OFF indica-
tor
5.
Air bag diagnosis sensor unit
6.
Satellite sensor (LH/RH)
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< SYSTEM DESCRIPTION >
[FOR USA AND CANADA]
SRS AIR BAG SYSTEM
Component Description
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7.
Front seat belt pre-tensioner (LH/
RH)
8.
Seat belt buckle switch (Driver side/
Passenger side)
9.
Front side air bag module (LH/RH)
10. Side curtain air bag module
11.
Crash zone sensor
12. Occupant Classification System seat
sensor mat
13. Occupant Classification System con-
trol unit
Component
Function
Air bag diagnosis sensor unit
Detects a collision and supplies power supply for deployment to air bag module and
pre-tensioner seat belt.
Air bag module
• Driver
• Passenger
• Side
• Curtain
Receives signal from air bag diagnosis sensor unit and deploys air bag.
Seat belt pre-tensioner
Receives signal from air bag diagnosis sensor unit and deploys seat belt pre-tension-
er.
Seat belt buckle switch
Controls deployment timing based on seat belt fastened or unfastened condition.
Crash zone sensor
Transmits signal to air bag diagnosis sensor unit when a frontal collision occurs.
Satellite sensor (LH/RH)
Transmits signal to air bag diagnosis sensor unit when a side collision occurs.
Occupant Classification System control unit
Detects passenger seat occupant and judges whether or not passenger seat air bag
is deployed.
Combination meter (air bag warning lamp)
Indicates air bag malfunctioning and deployment by blinking and illuminating air bag
warning lamp.
Passenger air bag OFF indicator
Indicates whether or not passenger air bag is in the activation mode based on the
judgement of Occupant Classification System.
Combination switch (spiral cable)
Supplies power supply to driver air bag module on steering wheel.
OCCUPANT CLASSIFICATION SYSTEM
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OCCUPANT CLASSIFICATION SYSTEM
System Diagram
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OCCUPANT CLASSIFICATION SYSTEM
System Description
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This Occupant Classification System (OCS) has the following function.
1.
Suppress the deployment of passenger air bag when passenger seat is empty, or when occupied by child
and child-seat. Turns on passenger air bag OFF indicator (Cut-off telltale) when passenger seat is occu-
pied by child-seat and child.
2.
Indicates malfunction portion with blinking times of air bag warning lamp in diagnosis mode.
3.
Indicates the malfunctioning record by CONSULT-III.
NOTE:
Operation of air bag diagnosis sensor unit when air bag diagnosis sensor unit receives information from Occu-
pant Classification System (OCS)
Component Parts Location
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Status (front passenger
seat)
Passenger air bag
Passenger air bag
OFF indicator (Cut-off
telltale)
Air bag warning lamp
Seat belt warning lamp
(when front passenger
seat is unbuckled)
Empty
Suppress
Off
Off
Off
Child/ child-seat
Suppress
On
Off
On
Adult
Enable to deploy
Off
Off
On
Malfunction
Suppress
On
Blinking
Off
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