Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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.
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.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.