Circuit/System Description

The inflatable restraint sensing and diagnostic module (SDM) monitors the passenger seat status and the passenger seat belt buckle switch and provides an output to the passenger seat belt indicator. When the inflatable restraint sensing and diagnostic module detects the passenger seat is occupied and the seat belt is not fastened, the inflatable restraint sensing and diagnostic module supplies a pulse width modulated signal to control the passenger seat belt indicator circuit. The inflatable restraint sensing and diagnostic module monitors the passenger seat belt indicator circuits and if a fault is detected a DTC will be set.