The supplemental
restraint system (SRS) is designed to supplement the seat belt to help
reduce the risk or severity of injury to the driver and passenger by
activating and deploying the driver, passenger, side airbag and belt
pretensioner in certain frontal or side collisions.
The SRS (Airbag)
consists of ; a driver side airbag module located in the center of the
steering wheel, which contains the folded cushion and an inflator unit ; a
passenger side airbag module located in the passenger side crash pad
contains the folded cushion assembled with inflator unit ; side airbag
modules located in the front seat contain the folded cushion and an
inflator unit ; curtain airbag modules located inside of the headliner
which contains folded cushions and inflator units. The impact sensing
function of the SRSCM is carried out by electronic accelerometer that
continuously measure the vehicle’s acceleration and delivers a
corresponding signal through amplifying and filtering circuitry to the
microprocessor.
SRSCM (SRS Control Module)
SRSCM will detect front
impact with front impact sensors and internal acceleration sensors inside
of SRSCM. For side impact, SRSCM will detect the side impact with 4 side
impact sensors, 2 conventional acceleration sensors in Center pillar inner
locations and 2 pressure sensing sensors in side of front door module, and
internal acceleration sensor inside of SRSCM.
SRSCM is designed to
issue corresponding airbag module(s) deployment(s) using above described
sensor inputs.
| 1. |
DC/DC converter: DC/DC converter in power
supply unit includes up/down transformer converter, and provides
ignition voltage for all firing circuits, implemented as ASICs and
the internal operation voltage of the SRSCM itself. if the internal
operation voltage is below critical value setting, it will perform
resetting. |
| 2. |
Back up power supply: SRSCM has separate back
up power supply, that will supply deployment energy instantly in low
voltage condition or upon power failure by front
crash. |
| 3. |
Self diagnosis: SRSCM will constantly monitor
current SRS operation status and detect system failure while vehicle
power supply is on, system failure may be checked with trouble codes
using GDS. |
| 4. |
Airbag warning lamp on: Upon detecting error,
the module will transmit signal to SRSCM indicator lamp located at
cluster. MIL lamp will indicat to the driver that there is an SRS
error. Upon ignition key on, SRS lamp will turn on for about six
seconds. |
| 5. |
Trouble code registration: Upon error
occurrence in system, SRSCM will store DTC corresponding to the
error. DTC can be cleared only by GDS. However, if an internal fault
code is active or if a crash is recorded the fault clearing cannot
be performed. |
| 6. |
Self diagnostic connector: Data stored in
SRSCM memory will be output to GDS or other external output devices
through a connector located below driver side crash
pad. |
| 7. |
Once airbag is deployed, SRSCM should not be
used again but replaced. |
| 8. |
SRSCM will determine whether passenger fasten
the seat belt by the signal from built-in switch in seat belt
buckle, and deploy front seat airbag at each set crash
speed. |
| 9. |
Side airbag deployment will be determined by
SRSCM that will detect satellite sensor impact signal upon side
crash, irrespective to seat belt
condition. |
