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

MODEL 204.0 /2 with CODE (299) PRE-SAFE up to Model Year 8 

Illustrated on model 204.0 

Fig 1: Locating Front Reversible Emergency Tensioning Retractors

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 Electronic Stability Program control unit (N30/4), which transmits the signal for activating the reversible emergency tensioning retractors.