How to Reset Pre Safe Mode Mercedes?

The “Pre-Safety” mode in Mercedes consists of a variety of safety-related features and technologies that the vehicle uses to detect and respond to potential dangers while driving. It is an important and potentially life saver safety feature because it can help to protect the occupants of a vehicle in the event of a collision. By adjusting the seats and headrests, closing the windows and sunroof, and tightening the seat belts, Pre-Safe can help to reduce the risk of injury in a crash. Additionally, by activating the brakes if necessary, Pre-Safe can help to reduce the severity of an accident and keep the passenger safe in case of a collision and accident.

if the PreSafety setting in your Mercedes is no longer working correctly, then it must be reset to restore its full functions. In this post, we’ll discuss what the pre-safety mood is, how to reset it, and what it means when it says “pre-safe functions are limited”. 

How Do I reset the pre-safety mood in Mercedes?

Resetting the Pre-Safety system in your Mercedes doesn’t have to be a hassle and can be done safely with the help of a qualified technician. But before attempting any of the steps discussed in this guide, always consult your owner’s manual or contact a certified Mercedes repair shop for assistance. With proper care, your Mercedes should remain safe and reliable for years to come.

Resetting the Pre-Safety Mood in a Mercedes vehicle is a quick and easy process. To reset the Pre-Safety Mood, you will first need to locate the reset switch. But before beginning the reset process, make sure you turn off the engine, open the hood, and disconnect the battery power. This prevents any electrical currents from interfering with the reset process. Once the power has been disconnected, you can start the reset process.

Once these steps are complete, you can begin the reset process. For most Mercedes models, resetting the safety system is as easy as pressing a combination of buttons on the car’s instrument panel. Consult your owner’s manual for the exact buttons to press for your particular model. 

Step 1: 

The first step is to disconnect all of the wires that are connected to the pre-safety system. You will also need to remove the airbag module (also known as the ECU), which is usually located under the dash on the driver’s side. Remove the module and disconnect the wires from the ECU. The wiring harness should also be examined to make sure there are no loose wires or connectors.

Step 2:  Identifying the reset switch


The reset switch looks like a small black button located near the driver’s seat or on the side of the dashboard. You may need to open the glove box to access the switch. 

Step 3: Resetting the Pre-Safety Mood 

Once you have located the reset switch, you need to access the vehicle settings menu. To do this, press the “Settings” button on your Mercedes dashboard and then select the “Restore” option. To reset the Pre-Safety Mood, you just need to press this switch. 

After resetting the Pre-Safety Mood, you will need to test it by trying one of its functions, such as automatic emergency braking, lane departure warning, or automatic cruise control. 

What Does It Mean When My Mercedes Says Pre-Safe Functions Are Limited?

To put it simply, the “Pre-Safe Functions Limited” error indicates that the vehicle has functioning issues in the area of Pre-Safe, which is a safety system in your vehicle. It’s a type of predictive technology with certain components like brake assist and blind spot monitoring that help to ensure that the car is functioning properly. When the Pre-Safe system is limited, it means that it is not performing to its full capability, which can be a major issue for any driver.

This could be caused by several factors and some possible causes of this warning message include:

  • Malfunctioning sensors such as radar, camera, or ultrasonic sensors.
  • Dust and Debris
  • Software issue with the vehicle’s control module.
  • Water or Snow Particles
  • faulty electrical systems, such as a blown fuse or a malfunctioning relay.
  • Issues with the Pre-Safe control module.

How to Fix the Pre-Safe Functions Limited Problem?

It’s important to not ignore this warning message, as the Pre-Safe system is designed to help protect the occupants of the vehicle in the event of a collision. If the system is not functioning properly, it may not be able to prepare the vehicle and its occupants for impact, which could increase the risk of injury in the event of a crash.

Check Your Battery

One of the first things to check if you have the “Pre-Safe Functions Limited” error is to make sure that your battery is in good condition. This is because a worn-out battery will not be able to power all of the electronics in your vehicle, which can lead to a limited Pre-Safe system. Have a look at the battery and if it’s looking old and worn out, then you may need to go get a new one.

Examine the Fuses

The next thing you can do to try fixing the “Pre-Safe Functions Limited” error is to take a look at the fuses. This is because if one of the fuses is blown, then the pre-safe system of your Mercedes won’t be running at its full potential. You can do this by popping the hood and inspecting the fuses. If you find one that is damaged, then you might want to replace it.

Seek professional help

If none of these measures have been able to solve the error and you’re still experiencing the “Pre-Safe Functions Limited” issue with your Mercedes, then it may be time to take it to a professional. Mercedes mechanics are experts when it comes to dealing with this type of problem and they should be able to get your car running back to its best in no time. 


Q. What do the Pre safe sensors in Mercedes mean?

A. Pre-Safe sensors in Mercedes-Benz vehicles are a part of the Pre-Safe system. They are designed to detect an imminent collision and prepare the vehicle and its occupants for impact. These sensors can detect things like sudden braking, steering inputs, and changes in the environment, such as a vehicle or obstacle in the road ahead. These sensors are crucial for the Pre-Safe system to function properly, as they are the ones that detect the danger and trigger the system’s response.

Q: How do I turn off pre-safety on my Mercedes?

A: To turn off the Pre-Safety setting on your Mercedes, you will need to access the vehicle settings menu and then press the reset switch. 

Q: What does pre-safe inoperative mean?

A: “Pre-safe inoperative” means that one of your safety features is not working correctly. If this is the case, then you should contact your local Mercedes service center to diagnose the issue and provide you with a solution.


The Pre-Safety Mood in Mercedes is an important feature that helps keep you and your passengers safe while on the road. If this setting becomes inoperative, then you will need to reset it to restore its full functions. Locating the reset switch and resetting the Pre-Safety Mood is a straightforward process. With the right knowledge and tools, you can ensure that your Mercedes remains safe and sound.


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