Seat Satellite, Driver / Passenger (SSFA / SSBF)
The satellites of the driver and passenger side are identical. The satellite is located below the seat frame between the seat rails. It is fitted with the seat module beneath a cover in a plastic tray.
The SSFA/SSBF contain no acceleration sensors but do evaluate the seat occupancy (SBE) sensors and the seatbelt buckle switches.
The seat satellites are responsible for deploying the driver/passenger seatbelt tensioners and the Active Head Restraint (comfort seat option only).
The satellite SSFA / SSBF are connected to the SIM via the byteflight. The power supply of the satellites is also from the SIM and it is buffered by the memory backup capacitor. In sleep mode of the byteflight , the power supply of the SSFA / SSBF is deactivated by the SIM. The watchdog function is run by the SIM.
The satellites SSFA/SSBF control and monitor the trigger circuits of the seatbelt lock ten-sioners and the Active Head Restraints. The belt buckles are monitored by a Hall sensor. The Hall switches are identical to those of the E38 since 3/97. The seat occupation detection is monitored via an interface in the satellite.