Mitsubishi Galant (2004+). Manual - part 1734

CONSTRUCTION AND OPERATION

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-9

CONSTRUCTION AND OPERATION

SYSTEM OPERATION

M2521001000213

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FRONT AIR BAG AND SEAT BELT WITH PRE-TENSIONER

In case of a frontal collision, if the SRS-ECU and the 
front air bag safing G sensor simultaneously detect 
an impact that based on criteria (turn ON), the 
SRS-ECU sends an ignition signal to the air bag 
modules (squibs) and seat belt pre-tensioners 
(squibs) on the driver and passenger sides, thus 
inflating the air bags and operating the seat belt 
pre-tensioners.

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AC306416

AB

ANALOG G SENSOR

IGNITION 
JUDGMENT

SHOCK 
ABOVE A 
CERTAIN 
LEVEL

IGNITION 
SIGNAL

SRS-ECU

FRONT IMPACT AGAINST 
ANOTHER VEHICLE

OR
FRONT IMPACT AGAINST A
SOLID SURFACE

FRONT AIR BAG 
SAFING G SENSOR

FRONT 
IMPACT 
SENSOR
(LH)

FRONT 
IMPACT 
SENSOR
(RH)

OCCUPANT
CLASSIFICATION-
ECU

SEAT 
BELT SWITCH

SEAT 
SLIDE SENSOR

AIR BAG OFF 
INDICATOR LIGHT

SEAT BELT
WARNING LIGHT

CONSTRUCTION AND OPERATION

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-10

SIDE AIR BAGS

In case of a side collision, if an impact that based on 
criteria is simultaneously detected by the side-impact 
sensors installed in a center pillar respectively and 
by the side air bag safing G sensor (the sensors turn 
ON), the SRS-ECU sends an ignition signal to the 
side air bag module on the relevant side to inflate 
them. 

DRIVER'S AIR BAG MODULE

M2521002000142

AC308644

AB

IGNITION 
JUDGMENT

SHOCK 
ABOVE A 
CERTAIN 
LEVEL

IGNITION 
SIGNAL

SRS-ECU

SIDE-AIRBAG MODULES

SIDE IMPACT 
SENSOR

SIDE IMPACT BY 
ANOTHER VEHICLE

AC308889

A

A

SECTION A - A

AIR BAG MODULE

INFLATOR

AIR BAG

MODULE COVER

AB

SQUIB CONNECTOR

CONSTRUCTION AND OPERATION

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-11

CAUTION

Improper services cause the sudden operation of 
driver’s air bag module or the system to be inop-
erative.  Do not disassemble or tamper with the 
air bag module to prevent the serious injury.
The driver’s air bag module incorporates a 4-spoke 
steering wheel. The driver’s air bag module is an 
assembly part consisting of an air bag, module cover, 
inflator, and their fasteners. The air bag is made from 
nylon and inflates by gas from the inflator. As a driver 
is being pressed to the air bag, it deflates discharg-
ing gas from two vents at the rear of the air bag to 
reduce the shock from the impact.

The driver's air bag deploys by changing its inflation 
pressure in two steps.
The inflator has two squib connectors to deploy the 
air bag in two steps.

FRONT PASSENGER'S AIR BAG MODULE

M2521003000123

CAUTION

Improper services cause the sudden operation of 
front passenger's air bag module or the system 
to be inoperative.  Do not disassemble or tamper 
with the air bag module to prevent the serious 
injury.
The front passenger’s air bag module consists of an 
air bag, inflator, module cover (incorporating the 
instrument panel pad), and their fasteners.

The air bag is made from nylon and inflates by the 
gas from the inflator. As a passenger is being 
pressed to the air bag, it deflates, discharging gas 
from two vent holes at the side of the air bag to 
reduce the shock from the impact.
The front passenger’s air bag deploys by changing 
its inflation pressure in two steps.
The inflator has two squib connector to deploy the air 
bag in two steps.
The front passenger air bag does not deploy at the 
front passenger seat is not occupied and when the 
occupant classification sensor in the front passenger 
seat senses a weight on the seat of less than 66 
pounds (30 kg).

AC306325

AC306752

AC308893

AB

SECTION A - A

AIR BAG

INFLATOR

A

A

AIR BAG MODULE

AIR BAG

INFLATOR

SQUIB CONNECTOR

SQUIB CONNECTOR

CONSTRUCTION AND OPERATION

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-12

SIDE AIR BAG MODULE

M2521004000085

CAUTION

Improper services cause the sudden operation of 
side air bag module or the system to be inopera-
tive.  Do not disassemble or tamper with the air 
bag module to prevent the serious injury.
The side-airbag module consists of an air bag, air 
bag cover, inflator and their fasteners. The modules 
are installed in the outer side supports of the driver’s 
and front passenger’s seatbacks. The side-airbags 
help protect the occupants regardless of the seat 
position and seatback angle.

The side-airbag are made of nylon fabric. The air 
bags are compactly folded and stored under the 
cover. On the side of the air bags, there are holes 
through which gas is partially released to alleviate 
shock to the occupant when the air bag is deployed.

CLOCK SPRING

M2521001100027

CAUTION

Improper services cause the system to be inop-
erative.  Do not disassemble or tamper with the 
clock spring to prevent the serious injury.
The clock spring consists of a flat cable, rotator, sta-
tor, etc. While this clock spring is essentially the 
same as before, it does not have a neutral position 
indication mechanism. Therefore, the clock spring 
centering procedures are different.

NOTE: For the clock spring centering procedures, 
refer to the SERVICE MANUAL.

AC308431AB

AIR BAG MODULE

INFLATOR

AIR BAG

COVER