Hyundai Elantra HD: General Information
General
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 driver and passenger 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 sensor,
and side impact with side impact sensor, and determine airbag module deployment.
| 1. |
DC/DC converter: DC/DC converter in power supply
unit includes up/down transformer converter, and provide ignition voltage
for 2 front airbag ignition circuits and the internal operation voltage
of the If the internal operation voltage is below critical value setting,
it will perform resetting.
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| 2. |
Safety sensor: Safety sensor is located in airbag
ignition circuit. Safety sensor will operate airbag circuit at any deployment
condition and release airbag circuit safely at normal driving condition.
Safety sensor is a double contact electro-mechanical switch that will
close detecting deceleration above certain criteria.
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| 3. |
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.
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| 4. |
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 scan tool.
(Hi-Scan)
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| 5. |
Airbag warning lamp on: Upon detecting error, the
module will transmit signal to SRSCM indicator lamp located at cluster.
MIL lamp will indicate driver SRS error. Upon ignition key on, SRS lamp
will turn on for about six seconds.
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| 6. |
Trouble code registration: Upon error occurrence
in system, SRSCM will store DTC corresponding to the error. DTC can
be cleared only by Hi-Scan. However, if an internal fault code is logged
or if a crash is recorded the fault clearing should not happen.
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| 7. |
Self diagnostic connector: Data stored in SRSCM memory
will be output to Hi-Scan or other external output devices through connector
located below driver side crash pad.
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| 8. |
Once airbag is deployed, SRSCM should not be used
again but replaced.
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| 9. |
SRSCM will determine whether passenger put on seat
belt by the signal from built-in switch in seat belt buckle, and deploy
front seat airbag at each set crash speed.
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| 10. |
Side airbag deployment will be determined by SRSCM
that will detect satellite sensor impact signal upon side crash, irrespective
to seat belt condition.
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