Seat Belt Tensioner: Description and Operation

GF91.40-P-4020CE Component Description For Front Reversible Emergency Tensioning Retractor
- with CODE (299) PRE-SAFE

Component Identification:

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

Task
The reversible emergency tensioning retractors perform the functions of the PRE-SAFE system and, as of 1.6.09, the seat belt slack reduction function.

The reversible emergency tensioning retractors perform the following tasks:
^ Reading in of signals
^ Evaluation of input factors
^ Actuating components

Reading in of signals
The input factors are read in via the following connection:
^ Chassis CAN (CAN E)

Chassis CAN
The signals are received by the reversible emergency tensioning retractor via chassis CAN.

The functions resulting therefrom are described in the corresponding function descriptions (see block diagram or function schematic).$

Evaluation of input factors
The variables read in by the integrated microprocessor are evaluated and the components for the corresponding reversible emergency tensioning retractor are immediately actuated.

Component actuation
The components are actuated via the following connection:
^ Chassis CAN

Chassis CAN
The signals are sent by the reversible emergency tensioning retractor via chassis CAN.

The functions resulting therefrom are described in the corresponding function descriptions (see block diagram or function schematic).$