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SRS
10
10.3 SRS OPERATION
The basic function of an airbag is to provide
cushioning effect to occupants. It works in
conjunction with seat belts and airbags.
The seat belt pretensioners remove any slack
from the belt system during the initial phase of an
accident. The load limiters in the belts reduce the
load level on the chest by release of belt length
from the retractor assembly.
In the event of a collision, airbag SRS ECU
monitors the rate of deceleration induced by the
collision, through impact sensors, to determine
whether the airbags should be deployed. The
circumstances affecting different collisions
(vehicle speed, angle of impact, type and size of
object hit etc.), vary considerably and will affect
the rate of deceleration accordingly.
NOTE:
The airbag SRS is not designed to
operate as a result of roll - over, rear
collisions, minor frontal or side impacts nor
will it operate as a result of heavy braking or
driving over bumps and potholes.
10.4 TIGHTENING TORQUES
Sr.
No.
Description
Torque
(Kg-m)
1
SRS ECU mounting
fasteners
0.9
2
PAB bracket to CCB fixing
(M5 X 19)
0.4±0.05
3
Clock spring fasteners
0.2~0.3
4
Front remote sensing unit
1.0
5
Side remote sensing unit
0.8±0.1
10.5 SAFETY PRECAUTIONS
The SRS system contains components which
could be potentially hazardous to the service
engineer if not serviced and handled correctly.
The following guidelines are intended to alert the
service engineer to potential sources of danger
and emphasize the importance of ensuring the
integrity of SRS components fitted to the vehicle.
It should be noted that these precautions are not
restricted to operations performed when servicing
the SRS system; the same care should be
exercised when working on ancillary systems and
components located in the vicinity of the SRS
components; these include but are not limited to:
Steering system - (steering wheel airbag)
Body and trim components - (passenger
airbag, seatbelt pre-tensioners, SRS ECU,
front remote sensing unit and passenger air
bag deactivation switch)
Electrical system components - (SRS
harnesses etc.)
WARNING:
1. The front airbag modules contain
extremely flammable components. Contact
with water, acid or heavy metals may
produce harmful or explosive compounds.
Do not dismantle, incinerate or bring into
contact with electricity.
2. Do not expose an airbag module or
seatbelt pre-tensioner to heat exceeding
85°C (185°F).
3. The inflator is intended not to fire below
the threshold current. To avoid inadvertent
triggering of the airbag, NEVER apply a
current through the squib except with the
specified test equipment and procedures.
4.
Never dispose the airbag module
undeployed without proper instructions as
this may result in possible injury. All
deployments
must
follow
special
instructions to be safe. All units shall be
activated (deployed) prior to disposal. It is
recommended that the module assembly
be dismantled for recycling of the
individual components. The gas generator
after activation can be scrapped as metal
or depending on design.