Seat Belt Reminder Lamp: Description and Operation

Fasten Seat Belt Indicator Circuit Operation
The Fasten Seat Belt Indicator receives battery voltage with the Ignition Switch (X134) in position II. The indicator is grounded through the Multi-Function Unit (MFU) (Z148) and the Driver's Seat Buckle Switch (X120). If the Driver's Seat Belt is buckled, the Driver's Seat Belt Buckle Switch opens and the Indicator turns off.