Kia 2004.5 Spectra Service Technical Training page 280

2004.5 Spectra Technology
BUCKLE SWITCH (BS)
OPERATION
The BSs are located in the buckle portion of the driver
and front passenger's seat belts.
The BSs are 5 volt reference hall effect type sensors
that are able to determine if the seat belts are
fastened by a change in the magnetic field when the
seat belt male portion is inserted into the buckle
portion.
The SRSCM monitors the state of the driver and
passenger seat belt buckles for:
1. Seat belt buckle fastened
2. Seat belt buckle not fastened
3. Open/Short to battery
4. Short to ground
This buckled/unbuckled information is sent to the
SRSCM to determine the deployment threshold level of
the air bags and the Belt Pretensioners BPT. A seat
belt that is not buckled reduces the threshold for
deployment of the airbag. The driver and/or
passenger that do not have the seat belt buckled will
experience an airbag deployment at a lower (less
severe) impact event. The safety belt is the primary
safety restraint.
The Spectra BPT fire/no fire algorithm chart will
change based upon seat buckle.
Supplemental Restraint System
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