Component Description For Front Reversible Emergency Tensioning Retractors - GF91.40-P-4020RD
Model 172.4
with code 299 (PRE-SAFE®)
Location
The reversible emergency tensioning retractors are in the relevant side wall.
Task
The reversible emergency tensioning retractors have the job of tensioning the seat belt of the driver or front passenger seat in certain hazardous situations by actuating an integrated actuator motor in order to minimize the consequences of a potential accident. If the seat belt adjustment function is active, the seat belt slack is additionally reduced when the seat belt is fastened.
The tasks are subdivided as follows:
- Reading in of signals
- Evaluation of input factors
- Transmitting signals
Reading in of signals
The following signals, among other things, are read in via chassis CAN (CAN E) (up to 29.02.2016) or chassis CAN 1 (CAN E1) (as of 01.03.2016):
- Crash signal
- PRE-SAFE® status
- PRE-SAFE® stage
- Status of seat belt adjustment function
- Status of driver belt buckle restraint system switch (S68/3)
- Status of front passenger belt buckle restraint system switch (S68/4)
The functions that use these signals are described in the individual function descriptions (see block diagram or function schematic).
Evaluation of input factors
The input factors that have been read in are evaluated by the integrated microprocessor and the relevant components are then actuated.
Transmitting signals
The reversible emergency tensioning retractors send the request to display a fault message, among other things, via chassis CAN (up to 29.02.2016) or chassis CAN 1 (as of 01.03.2016).
The functions that use these signals are described in the individual function descriptions (see block diagram or function schematic).
| Wiring diagram, reversible emergency tensioning retractor | PE91.40-P-2200-97TAA |