Seat Belt Tensioner: Description and Operation

GF91.40-P-4020T Front Reversible Emergency Tensioning Retractor, Component Description
- as of 1.6.06
- except CODE (494) USA version
- except CODE (498) Japan version
- as of 1.7.06
- with CODE (494) USA version
- with CODE (498) Japan version

Component Identification:

Location
The reversible emergency tensioning retractors are located in the respective B-pillar.

Task
The reversible emergency tensioning retractors perform the following tasks:
^ Reducing the existing seat belt slack
^ Fixing the occupants in position in the seats
^ Retain seat belt force
^ Release seat belt force

The reversible emergency tensioning retractors are connected via the Controller Area Network bus Class C (engine compartment) (CAN C) to the ESP control unit (N47-5), which transmits the signal to trigger the reversible emergency tensioning retractors.