Seat Belt Tensioner: Description and Operation

GF91.40-P-4020CA Component Description For Front Reversible Emergency Tensioning Retractor

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:
^ Reading in of signals
^ Evaluation of input factors
^ Actuation of components

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

Chassis CAN
The following signals are read in over the chassis CAN:
- provided by the supplement restraint system control unit (N2/10):
- Status of driver seat belt buckle restraint system switch (S68/3) and front passenger seat belt buckle restraint system switch (S68/4)

- provided by electronic stability program control unit (N30/4) (without code (233) DISTRONIC PLUS) or electronic stability program control unit Premium (N30/7) (with code (233) DISTRONIC PLUS):
- Request for reversible emergency tensioning retraction

Evaluation of input factors
The input factors that have been read in are evaluated by the integrated microprocessor and the affected components are then actuated.

Actuation of components
Actuation of the components takes place via the following connections:
^ Chassis CAN
^ Direct line

Chassis CAN
The following components are actuated via the chassis CAN:
- Instrument cluster (A1)

Direct line
Components integrated into the reversible emergency tensioning retractors are actuated directly.