CTYON 2006.03
8810-01
CIRCUIT
3) CIRCUIT DESCRIPTION
(1) OVERVIEW
The air bag systems for this vehicle are not much different from the previous air bag system
installed in KYRON. The curtain air bags are installed at the bottom of the roof trim and they
enhance the passenger’s safety. The driver’s and passenger’s curtain air bags
individually deploy.
When the front air bags deploy, the seat belt pretensioners retract the seat belts too.
Collision sensors, a kind of impact G (acceleration) sensor, detect the front and longitudinal
collisions and determine whether or not the air bags are deployed. The roles of each collision
sensor are as below
Front G sensors (inside the air bag unit)
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Send signals to the front air bags and the driver’s and front passenger’s seat
belt pretensioners.
By the signal from this sensor, front air bags (driver’s and passenger’s air bags)
deploy and the seat belt pretensioners of the driver’s and passenger’s seat belts
retract seat belts.
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Curtain air bag G sensors
▶
These are located inside the left and right B-pillar panel bottoms. When a collision
occurs, the air bag at the side of collision deploys accordingly. Please pay attention to
that, in the case of the curtain air bag, only the air bag at the side of collision deploys,
not both.
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When an air bag deploys (curtain air bags and seat belt pretensioners included), the
air bag unit must be replaced. Please do not attempt to delete the failure code with
SCAN-100 because some data about the deployment situation are stored in the unit.
The air bag related components, especially the air bag unit, must be stored in a
sealed case to prevent any damage.
Please do not connect a tester to any air bag connector or single item to measure the
supplied power or resistance. The detonator may explode due to a sudden extra
power supplied by the tester.
Before removing or installing any air bag related components, disconnect the
negative battery cable.
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(2) DRIVER AND PASSENGER BPT (BELT PRE-TENSIONER)
The belt pretensioner retracts the seat belt to tighten or take up slack in the wearer's belt.
When a collision occurs or when brakes are applied, a seat belt with a pretensioner detects
the stopping action and tightens the belt before the wearer is propelled forward. This holds
the occupant more securely in the seat.
(3) AIR BAG SYSTEM DEPLOY (FIRING LOOP)
According to the collision deceleration rate that each collision G sensor reads, the air bag unit
sends out about 2~4 or higher Amp current. This current generates some heat, which fires
the detonator in the inflator.
This table shows the basic inner resistance of the air bag related module and the basic
instant current necessary for a firing.
Please do not connect a tester to any air bag connector or single item to measure the
supplied power or resistance. The detonator may explode due to a sudden extra
power supplied by the tester.
Before removing or installing any air bag related components, disconnect the negative
battery cable.
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