Whether you’re a passenger or a driver, road safety is always a top priority. In order to ensure that vehicles are safe on the road, vehicle manufacturers develop high-tech protective systems.
A Mercedes community initiative called PRESAFE System is one of them. The purpose of this feature is to provide the maximum level of protection for you and others on the road.
The following models have Mercedes Pre-Safe Functions Limited installed or available:
Mercedes Pre-Safe Functions Limited
| Mercedes-Benz C-Class | Mercedes-Benz S-Class |
| Mercedes-Benz E-Class | Mercedes-Benz CLA |
| Mercedes-Benz GLA | Mercedes-Benz CLS |
| Mercedes-Benz SL & SLC | Mercedes-Benz GLC X253 |
| Hatchback C253 Coupe SUV | Mercedes-Benz GLS X164 X166 |
| Mercedes-Benz GLE MLW166 C292 SUV |
What Does A PRESAFE Function Mean?
In order to prevent an impending collision, a vehicle has a function called PRE-SAFE®. Using different sensors, automatic measures ensure the safety of occupants in your vehicle.
Mercedes Pre-Safe Functions Limited: Causes
- By chance, the seat belt retractor in the vehicle is faulty or disconnected.
- There is damage to the wires or the seat feels hard when released.
- A 12-volt battery that is weak or dead causes this problem.
- It could be related to the previous minor collision.
- Detected and avoided safely before an accident occurs.
- Electrical issues: Fuse malfunctions, loose connections, or corroded wires can cause this message.
- Software glitches: The functionality of a system can be affected by a minor software issue.
- Component failures: Motors, which adjust the seats and seatbelts, can malfunction.
What are the features of a pre-safe Mercedes-Benz?
Pre-safe systems reduce the consequences of accidents by preventing them. A driver’s actions and the vehicle’s behavior are tracked by that function.
If there is any possibility that the vehicle will crash or lose control, the following preventive actions will be performed:
- When the vehicle rolls over, the windows and sunroof automatically close, preventing large debris from entering. Consequently, passengers’ windows will not roll up as a result of preventing windows from closing on their fingers.
- During braking, the brakes raise pressure inside the calipers, increasing braking force and improving vehicle stopping. In this way, the car slows down to the maximum extent possible.
- During braking, the vehicle ties up the seatbelts to support the passenger against the seatback, and it repositions the backrests upright. If an accident occurs unluckily, these functions will ensure a favorable body position.
- A hazard light will be automatically activated when the vehicle brakes. The action warns other drivers that a sudden stop is approaching.
- To prevent hearing damage from loud noises during a crash, the vehicle’s audio system automatically generates a powerful buzzing sound.
A vehicle with all of these features is prepared for potential impacts. Both the driver and the passenger are less likely to suffer injuries in accidents when these matrixes are used.
There is an additional safety feature on some vehicles called Pre-Safe Brake. To reduce the chances of accidents, this protection feature applies automatic brakes if the driver fails to react immediately.
What Is PRESAFE® Sound?
The Pre-Safe sound in Mercedes is activated if the vehicle detects an unavoidable collision. “Pink noise” or “pink sound” is a short intrusion signal played by the vehicle sound system in such a scenario.
What Is PRESAFE® Brake?
With PRE-SAFE® Brake, vehicles detect critical situations using radar sensors. It applies a partial brake for approximately one and a half seconds if the critical situation continuously develops without the driver reacting.
How Does The PRE-SAFE® Safety System Work?
Several vehicle safety systems are involved in this advanced protection system. Using these systems, it collects all the necessary information for its operations.
An input and driver monitoring function constantly checks for signs of panic braking. Slamming the brakes suddenly and sharply occurs when the driver releases the throttle.
Skidding and sliding can also lead to accidents, so identifying the signs of an upcoming accident is also very important. The pre-safe systems use data from Mercedes ABS/ESP systems and wheel speed sensors.
Their windshields also contain forward-facing cameras and radars that aid PRESAFE in making sense of the surroundings.
This system identifies potential issues and obstacles before they arise by collecting and combining extensive data from these sources.
Why Does This Warning Message Occur On The MB Dash?
Safety-critical systems such as Pre-Safe are complex. It is essential for all components to operate optimally and successfully, even the slightest irregularity can affect the system’s performance.
This warning message may appear if any malfunction may affect Pre-Safe functions. Here are the most relevant reasons:
There may be problems with the control software or its features, or bugs in the code itself. It is common for software inputs to be implausible and not able to deal with real-life situations in most cases.
In the event of ABS or ESP problems, Pre-Safe’s functionality will be limited and its features may be affected. In addition to faulty wheel speed sensors, faulty ESP control units are potentially problematic.
The operation may be caused by driving in rugged and harsh conditions. During heavy downpours or snowfall, the function may not function properly. These issues can also occur when the windshield is replaced in an unprofessional manner.
How To Reset Pre Safe Mode On Mercedes?
To reset that function on your Mercedes, follow these steps:
Release the Pre Safe button after holding it for a few seconds. You should seek professional assistance if the warning message appears on the dash. An array of sensors detects irregularities in Mercedes models.
Conclusion
The “Mercedes Pre-Safe functions limited” has been thoroughly discussed, an enhancement to vehicle safety. By reducing the consequences of crashes, it prevents them from happening.
SRS/ABS/ESP, forward-facing cameras, radars, and other hardware and systems are used to implement several actions. The performance of PRESAFE will also be affected by any failures or issues in these systems.
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Frequently Asked Questions
Why is my PRESAFE not working?
Sensors that are dirty often cause this notification. Clean the front sensors of your vehicle to get it working again.
What causes most for that system?
A number of factors can cause this message, including incorrectly positioned sensors, weak batteries, and faulty seat belt switches. Identifying the exact problem requires a diagnostic tool.
How do I clear a Mercedes fault code?
In order to apply this technique, you need to clear the fault code. Your car’s instrument cluster has a reset button on the left side. When the display reads “To rest: Press reset button for 3 seconds”, press and hold the button. Once the reset button has been pressed, the display should read “system has been reset.”.
