B-Pillar Satellite, Left (SBSL): Notes

The SBSL is located in the left B-pillar above the seatbelt inertia reel. The SBSL contains a sensor for transverse acceleration only.

The left B-pillar satellite is responsible for deploying the drivers seatbelt tension limiter.

Fig 1: Identifying Location Of SBSL

Courtesy of BMW OF NORTH AMERICA, INC.

Fig 2: View Of B-Pillar Satellite, Left (SBSL)

Courtesy of BMW OF NORTH AMERICA, INC.

The SBSL satellite is connected to the SIM via the byteflight.  The power supply of the satellite 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 SBSL is deactivated by the SIM.

The watchdog function is run via the SIM. The SBSL monitors the ignition stage for the belt tension limiter of the seatbelt on the driver's side.

Fig 3: B-Pillar Satellite, Left (SBSL) Circuit Diagram

Courtesy of BMW OF NORTH AMERICA, INC.