Nissan Qashqai J11. Manual - part 1019

SRC-14

< SYSTEM DESCRIPTION >

SYSTEM

SYSTEM

System Description

INFOID:0000000010377817

SYSTEM DIAGRAM

SYSTEM DESCRIPTION

Supplemental Restraint System (SRS) activates air bag module and seat 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

JMHIA2896GB

SYSTEM

SRC-15

< SYSTEM DESCRIPTION >

C

D

E

F

G

I

J

K

L

M

A

B

SRC

N

O

P

reduces the impact that occupant receives when vehicle collision occurs. Air bag diagnosis sensor unit sup-
plies 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 sensor, 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 diagnosis sensor unit, air bag module ignites pyrotechnic
material using electric igniter (squib) so that gas generating material generates high temperature nitrogen gas.
The gas through filter activates air bag. At the same time, pre-tensioner seat belt receives power supply from
air bag diagnosis sensor unit, gas generator is activated, and then gas is generated. Balls in pipe are moved
according to generated gas pressure and strike pinion gear on ELR shaft. ELR shaft rotates and retracts seat
belt.

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 turns

air bag warning lamp ON.

• Detects and records the deployment of air bag and seat belt pre-tensioner, and turns ON air bag warning

lamp.

• Indicates the malfunction record via CONSULT.
• Transmits car crash information signal to BCM when a collision is detected (collision detection output func-

tion).

Air Bag Warning Lamp

• Detects electrical malfunction in air bag system and seat belt pre-tensioner system, and turns air bag warn-

ing lamp ON.

• Detects deployment malfunction in air bag system and seat belt pre-tensioner system, and turns air bag

warning lamp ON.

• Air bag diagnosis sensor unit warns the driver by turning air bag warning lamp ON when air bag diagnosis

sensor unit detects battery low voltage. Air bag warning lamp turns ON when a voltage value at which air
bag diagnosis sensor unit cannot operate normally (9 V or less) is detected for 10 seconds or more. After
starting to turn ON, air bag warning lamp turns OFF when air bag diagnosis sensor unit detects the normal
value of battery voltage for 10 seconds or more. The mode cannot be switched to diagnosis mode by ignition
switch while air bag warning lamp turns ON due to this cause. 

• Air bag diagnosis sensor unit warns the driver by turning air bag warning lamp ON when air bag diagnosis

sensor unit detects battery high voltage. Air bag warning lamp turns ON when a voltage value at which air
bag diagnosis sensor unit cannot operate normally (16 V or more) is detected for 3 seconds or more. After
starting to turn ON, air bag warning lamp turns OFF when air bag diagnosis sensor unit detects the normal
value of battery voltage for 3 seconds or more. The mode cannot be switched to diagnosis mode by ignition
switch while air bag warning lamp turns ON due to this cause.

SRC-16

< SYSTEM DESCRIPTION >

SYSTEM

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, seat belt pre-tensioner and lap pre-tensioner are activated in a frontal
collision.
SRS configurations that are activated for the following collision modes.

×

: Apply   —: Not apply

Air bag warning lamp operation

SRS condition

No malfunction is detected

• Air bag is deployed
• Seat belt pre-tensioner is deployed
• Air bag diagnosis sensor unit is malfunctioning
• Air bag warning lamp circuit is malfunctioning
• The system is malfunctioning
• Battery voltage is low (less than 9 V) or high battery voltage 

(more than 16 V)

• Self diagnostic result is not erased after repair

• Air bag diagnosis sensor unit is malfunctioning
• Air bag warning lamp circuit is malfunctioning

SHIA0011E

SHIA0013E

SHIA0014E

SRS configuration

Frontal collision

Rear collision

Left side collision

Right side collision

Driver air bag module

×

—

—

*1

—

*1

Passenger air bag module

×

—

—

*1

—

*1

Seat belt pre-tensioner LH

×

—

*1

—

*1

—

*1

Seat belt pre-tensioner RH

×

—

*1

—

*1

—

*1

Lap pre-tensioner LH 

×

—

*1

—

*1

—

*1

Lap pre-tensioner RH 

×

—

*1

—

*1

—

*1

Side air bag module LH

—

*2

—

×

—

*2

Side air bag module RH

—

*3

—

—

*3

×

Curtain air bag module LH

—

*2

—

×

—

*2

SYSTEM

SRC-17

< SYSTEM DESCRIPTION >

C

D

E

F

G

I

J

K

L

M

A

B

SRC

N

O

P

*1: SRS may be activated when an excessive impact is applied toward the front of the vehicle.
*2: SRS may be activated when an excessive impact is applied toward the left of the vehicle.
*3: SRS may be activated when an excessive impact is applied toward the right of the vehicle.

PASSENGER AIR BAG CUTOFF FUNCTION

The passenger air bag module can change ON/OFF of the function by operating passenger air bag cutoff
switch. The passenger air bag cutoff switch is located in the left side of glove box. The indicators in indicator
unit turn on/off according to the passenger air bag cutoff switch state.
• When passenger air bag cutoff switch is turned to the ON position, the passenger air bag module is enabled

and could inflate for certain types of collision. And front passenger air bag on indicator turn on.

• When the switch is turned to the OFF position, the passenger air bag module is disabled and will not inflate.

And front passenger air bag off indicator turn on.

NOTE:
The driver side air bag module always reminds enabled and is not affected by the passenger air bag cutoff
switch.

Curtain air bag module RH

—

*3

—

—

*3

×

Collision detection output function

×

×

×

×

SRS configuration

Frontal collision

Rear collision

Left side collision

Right side collision