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.

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

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.

The SRS consists of four air bag modules, SRS air
bag control unit (SRS-ECU), two front impact sen-
sors, two side impact sensors, SRS warning light,
passenger’s air bag OFF indicator light, passenger’s
seat belt warning light, clock spring, seat belt
pre-tensioner, seat belt switch, seat slide sensor,
occupant classification sensor and occupant classifi-
cation-ECU. Air bag modules are located in the cen-

ter of the steering wheel and above the glove box.
Side-airbags are located inside the front seatback
assemblies. Each air bag consists of a folded air bag
and an inflator unit. The SRS-ECU placed on the
forefront of the floor monitors the system and has a
front air bag safing G-sensor, front air bag analog
G-sensor and a side-airbag safing G-sensor. The
front impact sensor is assembled in the radiator sup-
port panel to monitor impact in case of front impact.
The side impact sensors inside the center pillars
monitor the shock incurred by the sides of the vehi-
cle. The SRS warning light on the combination meter
indicates the operational status of the SRS. The
clock spring is installed in the steering column. The
seat belt pre-tensioner is built into the driver's and
passenger's front seat belt retractor. The seat slide
sensor is installed at the seat adjuster section of the
driver seat in order to detect the driver seat slide
position. The occupant classification sensor is
installed underneath a rail of the passenger seat to
detect the load on the seat. The passenger’s air bag
OFF indicator light is installed to the lower left of the
multi-center display, and illuminates when the pas-
senger seat airbag is inactive. The passenger’s seat
belt warning light is installed to the lower right of the
multi-center display, and illuminates when the pas-
senger is not wearing the seatbelt. The seatbelt
switch detects whether the seatbelt is used.
Only authorized service personnel should do work on
or around the SRS components. Those service per-
sonnel should read this manual carefully before start-
ing any such work.

GENERAL DESCRIPTION

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-4

ON-BOARD DIAGNOSTIC/SRS WARNING LIGHT
FUNCTION
The diagnosis unit monitors the SRS system and stores data
concerning any detected faults in the system. When the ignition
switch is in "ON" or "START" position, the SRS warning light
should illuminate for about seven seconds and then turn "OFF."
That indicates that the SRS system is in operational order. If
the SRS warning light does any of the following, immediate
inspection by an authorized dealer is needed:
1. The SRS warning light does not illuminate as described

above.

2. The SRS warning light stays on for more than seven

seconds.

3. The SRS warning light illuminates while driving.
If a vehicle's SRS warning light is in any of these three condi-
tions, the SRS system must be inspected, diagnosed and ser-
viced in accordance with this manual.

AC307341

SRS WARNING LIGHT

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