Seat Satellite, Rear (SSH): Notes

The rear seat satellite is installed if the vehicle is ordered with rear side airbags (SA 261). The special equipment also includes the Advanced HPS (AHPS) for rear seat passengers, but these are triggered by the SASL/SASR. The rear seat satellite is fitted beneath the rear seat cushion in the middle area.

Fig 1: Identifying Seat Satellite, Rear (SSH)

Courtesy of BMW OF NORTH AMERICA, INC.

The SSH contains no acceleration sensors but does evaluate the rear seat occupancy (SBE) sensors.

The seat satellite, rear is responsible for deploying the left/right rear passenger airbags and seatbelt tensioners. Additionally if the vehicle is equipped with basic seats the SSH is responsible for controlling the electric rear head restraints.

The satellite SSH is 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 SSH is deactivated by the SIM. The watchdog function is run by the SIM.

The power supply for the head restraint adjustment is unaffected by this.

Fig 2: Seat Satellite, Rear (SSH) Circuit Diagram

Courtesy of BMW OF NORTH AMERICA, INC.