S 600 Coupe (140.076) V12-6.0L (120.980) (1995)
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Seat Belt Buckle Switch: Description and Operation
The left front seatbelt buckle switch with AB and ETR (S68/3) and right front seatbelt buckle switch with AB and ETR (S68/4) monitor whether the
three-point seatbelts on the driver and passenger seats are fastened. If the seatbelt is not buckled they cause the emergency tensioning retractor control
module with airbag to actuate the driver and/or passenger airbag when actuation threshold 1 is exceeded.