ZEST AND BOLT - page 866

SRS
5
10.2.5 SRS WARNING LAMP
The “AIR BAG” warning lamp is located in the
instrument cluster and controlled by SRS ECU.A
warning indicator in instrument cluster will alert to
any malfunction of the airbag SRS. Under normal
/fault free condition, the air bag warning light
comes on for approximately 3 seconds and goes
off with ignition ON.
The vehicle should always be checked for airbag
SRS if any of the following symptoms occurs:
The warning indicator fails to illuminate for
3sec when ignition switch is turned ON.
The warning indicator remains ON and fails to
extinguish within approximately 3 seconds
after ignition switch is turned ON.
The warning indicator illuminates after the
engine is started or while the vehicle is
running.
10.2.6 SEAT BELT PRETENSIONERS WITH
LOADLIMITERS
The seat belt pre tensioners activate in
conjunction with the SRS and provide additional
protection in the event of frontal impact of the
vehicle with sufficient severity.
The seat belts for both front seating positions are
equipped with pre-tensioning devices that are
designed to remove any slack from the seat belts
in the event of a collision. These devices improve
the performance of the seat belt system by
assuring that the belt is tight around the occupant
in a collision.
Along with pre-tensioning devices, the seat belts
are also provided with load limiters which ensure
that the occupant is optimally loaded by the seat
belt. The load limiting devices are only used in
conjunction with airbags.
The airbag SRS warning indicator on the
instrument cluster will alert you to any malfunction
of seat belt pre-tensioner.
NOTE:
After any impact, always check the seat
belts and pre-tensioners and replace if necessary.
(a) Pre-tensioner device
Pretensioner device is mounted in the retractor
unit.
The main function of a Pre-tensioner is to remove
slack from the belt in the event of an accident to
reduce forward movement of the occupant. The
Pre-tensioner unit essentially consists of a ball
cage comprising of a tube of steel balls
surrounding a toothed wheel. The wheel is
mounted on the belt-webbing spool.
When the ECU senses a crash, depending on the
crash severity, it sends a “fire” signal to the squib
in the belt Pre-tensioner. The firing of the squib
causes displacement of the balls in the tube. The
movement of the balls causes rotation of the
toothed wheel, which in turn rotates the webbing
spool and removes the slack from the belt.
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