Mercedes-Benz C-Class (W205) 2015 - 2021 Owners Manual: PRE-SAFE system

PRE-SAFE (anticipatory occupant protection)

PRE-SAFE is able to detect certain critical driving situations and implement pre-emptive measures to protect the vehicle occupants.

PRE-SAFE can implement the following measures independently of each other:

• Tightening the seat belts on the driver's seat and front passenger seat.
• Closing the side windows.
• Vehicles with sliding sunroof: Closing the sliding sunroof.
• Vehicles with memory function: Moving the front passenger seat to a more favorable seat position.
• Vehicles with multicontour seat: Increasing the air pressure in the seat side bolsters of the seat backrest.
• PRE-SAFE Sound: provided that the multimedia system is switched on, generates a brief noise signal to stimulate the innate protective mechanism of a person's hearing.

Reversing the PRE-SAFE system measures

If an accident did not occur, the pre-emptive measures that were taken are reversed.

You will need to perform certain settings yourself.

• If the seat belt pre-tensioning is not reduced, move the seat backrest back slightly.

  The locking mechanism releases.

Function of PRE-SAFE PLUS (anticipatory occupant protection plus)

PRE-SAFE PLUS can detect certain impacts, particularly an imminent rear impact, and take pre-emptive measures to protect the vehicle occupants. These measures cannot necessarily prevent an imminent impact.

PRE-SAFE PLUS can implement the following measures independently of each other:

• Tightening the seat belts on the driver's seat and front passenger seat.
• Increasing brake pressure when the vehicle is stationary. This brake application is canceled automatically when the vehicle pulls away.

If an accident did not occur, the pre-emptive measures that were taken are reversed.

System limitations

The system will not initiate any action in the following situations:

• when backing up

The system will not initiate any braking application in the following situations:

• whilst driving
  or
• when entering or exiting a parking space while using Active Parking Assist