Driver’s and front passenger’s air bags and seat belt
pre-tensioners deploy and operate in head-on colli-
sions that exceed the criteria to activate the SRS
system.
The front air bag deploys when a vehicle collides
head-on with a concrete (fixed) wall at approximately
25 km/h (15 mph) or more, or when a vehicle suffers
a severe impact from the front side.
The side air bag deploys when a center of side body
suffers a severe impact.
The front air bags and pre-tensioners may not work
under the following conditions:

•

A head-on collision is less than the criteria.

•

The collision is from the rear

•

The collision is from the side

•

The vehicle rolls over or is in a similar position.

The side-airbags may not work under the following
conditions:

•

A side-collision is less than the criteria.

•

The collision is from the front

•

The collision is from the rear

•

The vehicle rolls over or is in a similar position.

Driver’s and front passenger’s air bags and seat
belts with pre-tensioner are standard equipment.
Some models are equipped with side-airbags on
both driver’s and front passenger’s sides as standard
equipment. Side-airbags are optional on some mod-
els.

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
The SRS is designed to supplement the front seat
belts. It reduces injury to the driver(s) and the front
passenger(s) by deploying air bag(s) in case of a
head-on collision.
The SRS front air bags from an advanced air bag
system together with sensors at the vehicle and sen-
sors attached to front seats.

SRS SIDE-AIRBAG
Side-airbag systems in the front seats are activated
when side impacts exceed a criteria to protect the
occupants’ upper bodies.

SEAT BELT WITH PRE-TENSIONER
The seat belts with pre-tensioner work simulta-
neously with the SRS. The seat belt incorporating the
pre-tensioner automatically winds the seatbelt upon
front impact to reduce forward shifting of the driver’s
and passenger’s. The seat belt use status is used to
control the activation and deactivation of the
pre-tensioner.

GENERAL DESCRIPTION

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-3

System Component Parts

The SRS and seat belt pre-tensioner systems con-
sist of air bag modules, SRS-ECU, two front impact
sensors, two side impact sensors, SRS warning light,
clock spring, driver’s seat slide position sensor, pas-
senger’s occupant classification sensor, passenger’s
air bag OFF indicator light, passenger’s seat belt
warning light and seat belt pre-tensioner. Air bags
are located in the center of the steering wheel, above
the glove box, and in the front seatback assemblies.
Each air bag has a safing folded air bag and an infla-
tor. The SRS-ECU under the front floor console mon-
itors the system. The front impact sensor is
assembled in the radiator support panel to monitor
collision upon frontal impact. The side impact sensor
is assembled in the center pillar to monitor collision
upon side impact. The warning light on the instru-
ment panel indicates the operational status of the
SRS. The clock spring is installed in the steering col-
umn. The seat slide sensor is attached to the seat
rail and provides the air bag control unit with informa-
tion on the seat position. The occupant classification
sensors are attached to the seat rails and provide the
air bag control unit with information on the weight

applied to the front passenger seat. The passenger
air bag OFF indicator light is located above the cen-
tral vents in the instrument panel. The passenger
seat belt warning light is located above the central
vents in the instrument panel. The seat belt
pre-tensioner is incorporated in the seat belt retrac-
tor. The seat belt switch detects whether the seatbelt
is used.
The SRS-ECU will start a squib ignition current to the
driver's air bag module, front passenger’s air bag
module and seat belt pretensioner when simulta-
neously detecting frontal impact with the front impact
sensor and the SRS-ECU. It will also supply a squib
ignition current to the side-airbag module when
simultaneously detecting side impact with the side
impact sensor and the SRS-ECU.
The SRS-ECU has the following functions:
This triggers the air bag modules.

•

Power supply backup function that deploys or
operates the air bag module and seat belt
pretensioner within specific period, in case of
power failure upon impact.

•

Diagnostic test mode to improve safety and reli-
ability.

AC308646AB

SIDE-AIRBAG

PASSENGER'S
(FRONT) AIR BAG

DRIVER'S AIR BAG

SEAT BELT PRE-TENSIONER

GENERAL DESCRIPTION

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-4

CONSTRUCTION DIAGRAM

AC205757

AC304745

AC306318

AC306329

AC306289

AC306749

SRS WARNING LIGHT

VEHICLE
IDENTIFICATION
CODE CHART
PLATE

SIDE IMPACT
SENSOR

SIDE-AIRBAG
MODULE

SIDE IMPACT
SENSOR

FRONT IMPACT
SENSOR

PASSENGER'S (FRONT)
AIR BAG MODULE

SRS-ECU

CLOCK
SPRING

DATA LINK CONNECTOR
(FOR SCAN TOOL)

SEAT BELT WITH
PRE-TENSIONER

DRIVER'S AIR
BAG MODULE

PASSENGER'S SEAT BELT WARNING LIGHT

PASSENGER'S
AIR BAG OFF INDICATOR LIGHT

SEAT BELT WITH
PRE-TENSIONER

SEAT SLIDE
SENSOR

SEAT BELT
SWITCH

OCCUPANT
CLASSIFICATION
SENSOR

SRS-ECU

OCCUPANT
CLASSIFICATION-ECU

Content .. 1730 1731 1732 1733 ..