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

MODEL 211.0/2 as of 1.6.06 except CODE (494) USA version except CODE (498) Japan version 

MODEL 211.0/2 as of 1.7.06 with CODE (494) USA version with CODE (498) Japan version 

Fig 1: Locating Left And Right Front Reversible Emergency Tensioning Retractors

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

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.