Front reversible emergency tensioning retractor, component description - GF91.40-P-4020SX

MODEL 221.0/1 up to Model Year 8 

Fig 1: Identifying Left/Right Front Reversible Emergency Tensioning Retractor

Courtesy of MERCEDES-BENZ USA

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 chassis CAN to the ESP control unit (N47-5), which transmits the signal for activating the reversible emergency tensioning retractors.