Nissan Murano Z51. Manual - part 1353

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SRS AIR BAG SYSTEM

SYSTEM DESCRIPTION

SRS AIR BAG SYSTEM

System Diagram

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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-

JMHIA0500GB

SRS AIR BAG SYSTEM

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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.

• 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.

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

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

—

—

—

—

—

×

—

×

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SRS AIR BAG SYSTEM

Component Parts Location

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Component Description

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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)

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

JMHIA0493ZZ

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.

SRS AIR BAG SYSTEM

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Satellite sensor (LH/RH)

Transmits signal to air bag diagnosis sensor unit when a side collision occurs.

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.

Component

Function