Mercedes Pre-Safe Functions Limited Cause & Solutions [Explained]

Both drivers and passengers are concerned about road safety, which is always a priority. In order to ensure road safety, vehicle companies develop high-tech protective systems.

The Mercedes community founded a safety system called “PRESAFE System”. The maximum level of protection is provided to you and others on the road by this function. 

Mercedes Pre-Safe Functions Limited Cause & Solutions [Explained]

These models are available with Mercedes Pre-Safe Functions Limited, which MB has installed on them:

Table

Mercedes-Benz C-Class  Mercedes-Benz S-Class
Mercedes-Benz E-ClassMercedes-Benz CLA
Mercedes-Benz GLAMercedes-Benz CLS
Mercedes-Benz SL & SLCMercedes-Benz GLC X253
Hatchback C253 Coupe SUVMercedes-Benz GLS X164 X166
Mercedes-Benz GLE MLW166 C292 SUV

What Does A PRESAFE Function Mean?

An impending collision can be prepared for by using the PRE-SAFE® function. Autonomous measures ensure the safety of your vehicle’s occupants based on the data collected by different sensors.


Mercedes Pre-Safe Functions Limited: Causes

  • By chance, the seat belt retractor is broken or disconnected in the vehicle.
  • There are wires that are damaged, or the seat feels hard when released. 
  • Usually, it occurs when a 12-volt battery is weak or dead. 
  • There may have been a minor collision previously.
  • An accident that could have occurred, but was avoided safely after being detected earlier.
  • Electrical issues: Mercedes PRE-SAFE® fuses can malfunction, loose connections can occur, or wires may be corroded.
  • Software glitches: Even minor glitches can affect the functionality of the system.
  • Component failures: Motors and other components that adjust seatbelts and seats can malfunction.

What are the features of a pre-safe Mercedes-Benz?

Systems that prevent accidents and reduce their consequences are known as pre-safe systems. Monitoring the driver’s actions and monitoring the vehicle’s behavior are two functions of that system. 

What are the features of a pre-safe Mercedes-Benz

If there is any possibility of a car accident or loss of control, the following preventive actions will be taken:

  • Rollovers will stop large debris from entering the vehicle by closing the sunroof and windows automatically. Therefore, passengers’ windows won’t be able to roll up due to preventing windows from closing on their fingers.
  • Calipers increase braking pressure, which increases braking force and improves the vehicle’s stopping performance. The purpose of this action is to slow down the vehicle as much as possible.
  • The vehicle will tie up the seat belts and reposition the backrests when braking in order to support the passenger against the seat. By using these functions, you will be able to maintain a favorable position if you are unfortunate enough to be involved in a crash.
  • A system that automatically activates hazard lights when braking is in place. When other drivers see this action, they will be warned that the vehicle is about to stop suddenly.
  • A powerful buzzing sound is automatically generated by the audio system during a crash to protect the occupant from hearing damage caused by loud noises.

The purpose of all of these features is to prepare a vehicle for a possible collision. These matrixes contribute to the reduction of injury risks for both drivers and passengers in accidents.

A vehicle with the Pre-Safe Brake feature is an additional safety feature you should know about. A driver is prevented from causing an accident if the automatic brakes are applied automatically if they fail to react immediately.


What Is PRESAFE® Sound?

A pre-safe sound is activated by Mercedes when the vehicle detects an unavoidable collision. There will be a short intrusion signal called “pink noise” or “pink sound” played by the vehicle’s sound system in such a situation.

What Is PRESAFE® Brake?

In PRE-SAFE® Brake, radar sensors help vehicles identify critical situations before they initiate an emergency brake. For about one and a half seconds, the car applies a partial brake if its critical situation is continuously developing but the driver is not reacting.


How Does The PRE-SAFE® Safety System Work?

A number of vehicle safety systems, including the drivetrain, are relied upon for this advanced protection system. This system provides all the necessary information for the company’s operations by collecting data from them. 

Monitoring inputs and drivers is part of that feature, which is constantly looking for signs of panic braking. An involuntary release of the throttle and sudden and sharp braking can cause this. 

A significant factor is identifying potential accident signs that can result from skidding and sliding. Mercedes ABS/ESP system data and wheel speed sensors provide data for pre-safe systems.

Additionally, the PRESAFE system receives information from a series of forward-facing cameras and radars mounted in their windshields. 

A system that collects and combines extensive data from these sources will identify potential problems and take immediate action to prevent them from occurring.


Why Does This Warning Message Occur On The MB Dash?

A safety-critical system such as Pre-Safe requires a great deal of complexity. Every component of the system must function optimally and successfully, as even the slightest irregularity may negatively affect its performance. 

It displays a warning message when any malfunction affects the Pre-Safe functions. These are some of the most likely causes:

Why Does This Warning Message Occur On The MB Dash

There may be problems with the functionalities of control software or bugs within its code. Most sensors do not provide reliable software inputs and are incapable of handling real-life demands. 

In the event that ABS and ESP systems malfunction, Pre-Safe’s function and features will be limited. ESP control units that malfunction and wheel speed sensors that fail are potential sources of problems.

It is possible to cause this operation when driving in rugged and harsh conditions. In extreme weather conditions, like heavy downpours or snow, the device may not function properly. It is also possible to have these issues if the windshield replacement is not done properly.


How To Reset Pre Safe Mode On Mercedes?

The following steps will guide you through the process of resetting that function: 

For a few seconds, hold down the Pre Safe button, then release it. The best thing to do if the warning message remains on your dashboard is to seek professional assistance. In Mercedes models, irregularities are detected through a network of sensors.


Conclusion

Mercedes Pre-Safe functions limited is a message that enhances the overall safety of the vehicle. We have discussed it thoroughly. Consequently, it reduces the risk of crashes or prevents them from occurring. 

In addition to SRS/ABS/ESP, forward-facing cameras, radars, and other systems and hardware, the system performs several actions. PRESAFE functions and their performance are also affected by any failures and issues in these systems.


Frequently Asked Questions

Why is my PRESAFE not working?

It is common for this notification to occur due to dirty sensors. If you want it to work again, you’ll need to clean the front sensors.

What causes most for that system?

Seat belt switches may be defective, sensors may be placed incorrectly, batteries may be weak, or sensors may be positioned incorrectly. An accurate diagnosis must be made using a diagnostic tool.

How do I clear a Mercedes fault code?

You can use this technique by clearing fault codes. Your car’s instrument cluster should have a reset button (left side). Keep pressing and holding the reset button until you see “To rest: Press reset button for 3 seconds”. The screen will display “system has been reset” after you press the reset button agai

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