Seatbelt Anchor and Pretensioner
WARNING: This page is about a different car, the 2018 Lincoln Navigator. However, it is still accessible from the selected car via links, so may be relevant.
The seatbelt anchor pretensioner is a pyrotechnic device that removes excess of webbing slack from the seatbelts when deployed, and is serviced separately from the seatbelt retractor assembly.
To diagnose any pretensioner Diagnostic Trouble Codes (DTCs), Refer to:Airbag Supplemental Restraint System (SRS).