SRSCM INDEPENDENT LAMP ACTIVATION

1. |
Loss of ignition voltage supply to the SRSCM :
lamp turned on continuously. |
2. |
Loss of internal operating voltage : lamp
turned on continuously. |
3. |
SRSCM not connected : lamp turned on through
shorting bar in wiring harness
connector. |
CLOCK SPRING
The clock spring (coil
spring) consists of two current carrying coils. It is attached between the
steering column and the steering wheel. It allows rotation of the steering
wheel while maintaining continuous contact of the deployment loop through
the inflator module.

side impact sensor(sis)
The SRSCM is supported
with the side airbag function by two SIS, which act as intelligent
acceleration sensors and as such back up the central airbag controller.
Both the SIS continuously report the system statuson the left and
right-hand sides of the vehicle to the SRSCM.
When the ignition is ON, never cause a sudden
shock around the installation area of the satellite sensor by a
hammer, etc. Otherwise it could cause the airbag system to
unexpectedly deploy during
servicing. |
SRSCM
The SRS airbag system
has sophisticated electrical and electronic components. Therefore the
airbag operating components should be handled very carefully.
The SRSCM will deploy
the airbag modules by sensing the frontal impact sensed by the sensor
built in to the SRSCM.
1. |
DC/DC convertor : The DC/DC converter in the
power supply includes a step-up and a step-down converter, which
provides the firing voltage for four firing circuits and the
internal operating voltage. If the internal operating voltage falls
below a defined threshold, a reset is
executed. |
2. |
Arming sensor/safing sensor : The
arming/safing sensor built in to the airbag firing circuit has the
function of arming the airbag circuit under all required deployment
conditions and maintaining the airbag firing circuits unarmed under
normal driving conditions. The safing sensor is a dual-contact
electro mechanical switch that closes if it experiences a
deceleration exceeding a specified
threshold. |
3. |
Back-up power : The SRSCM reserves an energy
reserve to provide deployment energy for a short period when the
vehicle voltage is low or if lost in a vehicle frontal
crash. |
4. |
Back-up power : The SRSCM reserves an energy
reserve to provide deployment energy for a short period when the
vehicle voltage is low or if lost in a vehicle frontal
crash. |
5. |
Malfunction detection : The SRSCM continuously
monitors SRS operating status while the ignition key is turned on
and detects possible malfunctions in the system. The malfunction can
be displayed in the form of a diagnostic trouble code using the
Hi-Scan Pro. |
6. |
MIL (Malfunction Indication Lamp) notification
: If any fault is detected, the SRSCM sends a signal to the
indicator lamp on the instrument cluster to warn the vehicle
driver.
The MIL indicator is the key item in notifying
the driver of SRS faults. It verifies lamp and SRSCM operation by
flashing 6 times when the ignition switch is first turned
on. |
7. |
Malfunction recording : Once a fault occurs in
the system, the SRSCM records the fault in memory in the form of a
DTC, which can only be erased by the Hi-Scan
Pro. |
8. |
Data link connector : SRSCM memory stored is
linked through this connector located under neath the driver side
crash pad to an external output device such as the Hi-Scan
Pro. |
9. |
What if only BPT's
deploy. |
10. |
Crash output
The crash output is used to unlock the doors
in case of a crash. The crash output is : 0 ~ 200 μA in OFF mode and
200mA in ON mode. During the unlock command, the switch is closed
for 200
mS. |