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
pre-tensioner 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. SRSCM located on the floor under the heater
core which monitors the system, an accelerometer which senses the vehicle
deceleration, a spring interconnection (clock spring) located within the
steering column ; system wiring and wiring connector; and a knee bolster
located under the steering column. 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 circuity to the microprocessor.
SRSCM (SRS Control Module)
The SRS airbag system
consists of electrical and electronic. Be cautious in the airbag
parts.
SRSCM will detect front
impact with inside sensor, and side impact with side impact sensor, detect
airbag deployment request signal, 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 inside
operation voltage. If inside operation voltage is below critical
value setting, it will perform
re-setting. |
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. |
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. |
4. |
Self diagnosis: SRSCM will constantly monitor
current SRS operation status and detect system failure during
vehicle power supply is on, system failure may be checked with
trouble codes using scan too.
(Hi-Scan) |
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 be turned on about 6 seconds, then will be truned
off. |
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. |
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 seat crash
pad. |
8. |
Once airbag is deployed, SRSCM should not be
used again but replaced. |
9. |
SRSCM will determine whether passenger has put
on seat belt using built-in switch signal in seat belt buckle, and
deploy front seat airbag at each set crash
speed. |
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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