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

Passengers and drivers are equally concerned with road safety, which is always a top priority. The purpose of vehicle companies is thus to ensure road safety by developing high-tech protective systems.

Among them is the “PRESAFE System”, which was founded by the Mercedes community. The purpose of this function is to provide the maximum level of protection to you and other road users. 

According to the table below, Mercedes Pre-Safe Functions Limited is installed or is available for the following models:

Table

What Does A PRESAFE Function Mean?

An impending collision can be prepared for by using the PRE-SAFE® function of a vehicle. By using different sensors, automatic measures are taken to ensure your vehicle’s occupants’ safety.

Mercedes Pre-Safe Functions Limited: Causes

• There is a problem with the seat belt retractor, either by chance or the vehicle has disconnected it.
• There is damage to the wires or the seat feels hard when released. 
• There is a lack of power or a dead 12-volt battery that causes this problem. 
• It may be related to a minor collision that occurred previously.
• An accident that could have been avoided if it had been detected earlier but was safely avoided.
• Electrical issues: The Mercedes PRE-SAFE system may cause this message if fuses are malfunctioning, loose connections, or wires are corroded.
• Software glitches: Minor errors in software can have a big impact on the performance of a system.
• Component failures: Motors that adjust seatbelts or seats can malfunction.

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

Monitors the vehicle’s behavior and tracks the actions of the driver to prevent accidents if they could have been detected earlier. 

It will take the following preventative measures in the event of a car accident or loss of control:

1. A rollover prevents large debris from entering the vehicle by automatically closing the windows and sunroof. Thus, windows will not roll up if they are prevented from closing on the passenger’s fingers.
2. Brakes in the calipers increase pressure inside the calipers, thus increasing braking force and improving braking performance. Taking this action slows the car down to the greatest extent possible.
3. In the event of braking, the seat belts will be tightened and the backrests will be repositioned in the upright position so that the passenger is supported against the seat. If the crash takes place unluckily, these systems will ensure that your body is placed in a favorable position.
4. When the vehicle is braking, the hazard lights will be activated automatically. By doing this, other drivers are made aware that the vehicle is coming to a sudden stop.
5. A powerful buzzing sound is generated automatically by the vehicle’s audio system during a crash to protect your hearing.

Each of these features is designed to keep a vehicle safe in the event of an impact. This matrix reduces the risks of both the driver and the passenger being injured during an accident.

Certain vehicles have a safety feature called Pre-Safe Brake that adds another level of safety. An automatic brake system will be applied if the driver fails to react immediately, thereby preventing or reducing the risk of an accident.

What Is PRESAFE® Sound?

Pre-Safe is the name of the sound activated by a Mercedes vehicle in the event of an unavoidable collision. This scenario involves a short intrusion signal called “pink noise” or “pink sound” played by the vehicle’s sound system.

What Is PRESAFE® Brake?

With PRE-SAFE® Brake, vehicles can use radar to identify critical situations in order to initiate emergency braking. After approximately one and a half seconds, when no response is made to the critical situation, the vehicle applies a partial brake until the driver reacts.

How Does The PRE-SAFE® Safety System Work?

A drivetrain system and several other safety features contribute to the effectiveness of this advanced protection system. All of its operations are based on the information collected from these systems. 

A panic braking detection function constantly monitors inputs and drivers for signs of panic braking. Slamming the brakes suddenly and sharply is the result of the driver releasing the throttle and slamming the accelerator. 

It is also crucial to measure indicators of potential accidents that can occur while skidding and sliding. A pre-safe system is based on data collected from wheel speed sensors and the Mercedes ABS/ESP systems.

In addition to the forward-facing cameras and radars in their windshields, PRESAFE is able to gain perception through the forward-facing cameras and radars. 

These data sources will be used to collect and combine extensive information so that the system can recognize potential problems and take action promptly before they become critical.

Why Does This Warning Message Occur On The MB Dash?

System Pre-Safe plays an important role in ensuring the safety of our lives. It is crucial that the components of the system function optimally and effectively, no matter what the irregularity may be. 

Whenever there is any malfunction that may affect Pre-Safe functions, the vehicle displays a warning message “Pre-Safe functions limited.” These are the most relevant reasons why this might occur:

You may find that control software or its features contain bugs or are affected by affected functions. Generally, the software inputs from different sensors are implausible and cannot cope with real-life demands. 

As a result of issues with ABS and ESP systems, Pre-Safe’s functionality and features might be limited. Wheel speed sensors and ESP control units that malfunction are potential topics of discussion.

Those operations may occur as a result of driving in rugged and harsh environments. It may not function properly when there is heavy downpour or snow. It is also possible to experience these problems as a result of an unprofessional windshield replacement.

How To Reset Pre Safe Mode On Mercedes?

In order to reset that Mercedes function, you can follow these steps:

Once the Pre Safe button has been pressed, hold it for a few seconds before releasing it. You should seek professional help if you continue to see the warning message on the dash. In Mercedes models, irregularities are detected by means of a network of sensors.

Read: Mercedes B1 Service
Read: Mercedes Service A3
Read: Mercedes Service B9
Read: Mercedes B3 Service
Read: Mercedes A7 Service
Read: Mercedes B7 Service
Read: Mercedes A9 Service
Read: Service A5 Mercedes

Frequently Asked Questions

Conclusion

This message is an integral part of Mercedes Pre-Safe, which is designed to improve the safety of the vehicle in general. By reducing the consequences of car crashes, it prevents them from happening. 

With the help of SRS/ABS/ESP, forward-facing cameras, radars, and other hardware systems and elements, it implements several actions. It will impact the performance of PRESAFE functions as well if any failures or issues occur in these systems.

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