Kia 2004.5 Spectra Service Technical Training page 289

2004.5 Spectra Technology
BELT PRETENSIONERS
(BPT) OPERATION
Supplemental Restraint System
The front seat Belt Pretensioners are located at the
bottom of the "B" pillar behind the trim panel,
incorporated within the seat belt retractor.
When a vehicle has experienced an impact event that
causes the SRSCM to determine the event has
exceeded a threshold value, the BPTs will be deployed.
The Belt Pretensioners help reduce the severity of
injury to the front seat occupants by retracting the
seat belt webbing to keep the occupants in position.
After the seat belt is tightened, it then releases slightly
during the collision through the use of the built-in
force limiter that provides the occupant with a
controlled ride into the frontal airbags.
The BPTs are part of the seat belt retractors and
contain a pyrotechnic gas generator, which causes
movement of the piston in the manifold case that in
turn operates a rack gear. The seat belt webbing is
then retracted by the rotation of the retractor spool.
The gas generator is a service part and can be
replaced with out replacing the seat belt if
undamaged. The SRSCM can deploy the BPT 6 times
before the control module will need to be replaced.
This data is viewable on the Hi-Scan Pro.
N N o o t t e e : : V V e e r r y y l l o o w w s s p p e e e e d d i i m m p p a a c c t t s s m m a a y y o o n n l l y y
d d e e t t o o n n a a t t e e t t h h e e p p r r e e t t e e n n s s i i o o n n e e r r s s w w i i t t h h t t h h e e s s e e a a t t
b b e e l l t t f f a a s s t t e e n n e e d d . .
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