The SRSCM monitors the status of the driver and front
passenger seat belt buckle. The SRSCM provides one pin each for the
driver and front passenger seat belt buckle status input. The seat belt
buckle circuit operates from internal boost voltage supplied by the
SRSCM, and uses chassis ground for the signal return. The buckle status
modify the SRSCM deployment. If the buckle status is unbuckled, the
corresponding pretensioner will not be deactivated.