Seatbelt Anchor Pretensioners
WARNING: This page is about a different car, the 2021 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
The front seatbelt anchor pretensioners are pyrotechnic devices that remove excess webbing from the seatbelts when deployed. One is included as part of each front row outboard seatbelt assembly and cannot be serviced separately.