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Have you encountered a message on your dashboard saying ‘Blind Spot Assist Inoperative’ or ‘Blind Spot Assist Currently Unavailable’?
If you have, you’re not alone.
In this article, we’ll dive into the common causes of the ‘Blind Spot Assist Inoperative’ message and provide straightforward steps you can take to fix it.
Quick Answer: My Blind Spot Assist is not working.
A ‘Blind Spot Assist Inoperative’ message on Mercedes vehicles is often caused by dirty Blind Spot Assist sensors, a faulty fuse, or water in the sensors. You can fix it by cleaning the sensors or replacing the fuse.
What causes the ‘Blind Spot Assist Inoperative’ message?
The ‘Blind Spot Assist Inoperative’ message indicates that there’s an issue with the Blind Spot Assist system. This message can be seen on a variety of Mercedes models including the C300 and E350.
Here are the most common causes of the ‘Blind Spot Assist Inoperative’ message on a Mercedes:
- Bad weather conditionsThink of heavy snowfall, rain, or fog. These conditions can occur. make your car’s sensors dirty. This error message may be caused by a layer of ice or snow covering the sensors.
- Water in the sensors Water and electronics don’t mix well. If you’ve driven through heavy rain or just had your car washed, water might seep into the sensors. This can lead to short circuits and temporary malfunctions of the Blind Spot Assist System.
- Fuse failure.Blind Spot Assist has a fuse specific to your Mercedes. The system will stop working if this fuse blows. This can happen because of an electrical overload or normal wear and tear.
- Radar sensors for Blind Spot assist that are faulty.The radar sensor itself can be the cause of the problem. They can be damaged by an accident, internal faults or manufacturing defects.
- Heavy traffic or driving near barriers and walls.Blind Spot Assist can be overwhelmed by extended bumper-to-bumper driving or driving near walls. It’s constantly detecting objects, and in these scenarios, it might get a bit ‘tired’ and give you an inoperative message.
- Weak auxiliary battery. Last but not least, your car’s auxiliary battery powers lots of features, including the Blind Spot Assist. This battery could cause problems if it runs low. Mercedes fault codes.
Here is a section from the official Mercedes owner’s manual regarding the limitations of the Blind Spot Assist system:
How do you fix the ‘Blind Spot Assist Inoperative’ error?
Now that we know what might be causing the trouble, let’s get to fixing it.
Here are some steps that can help to resolve the ‘Blind Spot Assist Inoperative’ error:
- Clean the sensors.
- Check the Blind Spot Assist fuse.
- Check for water in the sensor.
- Measure the voltage of your auxiliary battery.
- Replace the faulty Blind Spot Assist Sensor.
1. Clean the sensors
Start with the easiest fix.
Your Mercedes’ Blind Spot Assist system relies on sensors to detect potential hazards.
These sensors can get dirty, especially if you’re driving through snow, ice, or even just a lot of dirt and grime.
If you see this message along with any of the following warnings, it could be that your radar sensor is dirty.
Cleaning all the radar sensors is a great way to reset the ‘Blind Spot Assist Inoperative’ message.
Here is the location of the Mercedes Blind Spot Assist Sensor:
- Front bumper mounted sensors.
- Sensors mounted on the rear bumper.
- Sensor/camera mounted to side mirror.
Here are some images to help you identify the location of all the sensors in the Blind Spot Assist System on a Mercedes.
Use a clean, soft cloth to gently wipe away any dirt, mud snow or ice.
It’s like cleaning your glasses; a clear view can make all the difference!
2. Check the Blind Spot Assist Sensor fuse
Next, let’s look at the fuses.
The Blind Spot Assist Sensor Fuse is usually located at location 116 in Mercedes vehicles.
However, we recommend checking your car’s manual to find which fuse is for the Blind Spot Assist sensor.
If it’s blown out, replace it with one that has the same rating.
3. Check for water inside the sensors
If you’ve recently driven through heavy rain or had your car washed, water might have gotten into the sensors.
Often, it is a temporary problem.
Give it some time to dry out, or if you’re in a hurry, a careful blast of compressed air can help speed up the process.
4. How to measure your auxiliary battery voltage
A weak auxiliary power supply can affect many things, including your Blind Spot Assist.
Check the voltage of your auxiliary batteries using a multimeter. If it’s low, charging or replacing the battery might be necessary.
5. Replace the faulty Blind Spot assist sensor
If you’ve tried all the above and the message still shows up, the sensor itself might be the problem.
This is a more complex problem that usually requires professional diagnosis and replacement.
Replacement of the Mercedes Blind Spot Assist sensors costs between $800 and $1,000.
It’s best to take your car to a certified mechanic or a Mercedes dealership for this.
What is Blind Spot Assistance on a Mercedes vehicle?
Blind Spot Assist is a safety feature designed to alert you when there’s a vehicle in your blind spot.
This is the area beside and slightly behind your car that you can’t see with your mirrors:
Here’s how it works:
- Radar sensors are a type of radar.Radar sensors are typically located in your Mercedes’ rear bumper. These sensors continuously send out signals which bounce back when they strike an object like another vehicle.
- Detection zone.The system has a detection zone where it looks for other vehicles. If a car enters this zone while you’re driving, the Blind Spot Assist kicks into action.
- Alert mechanismWhen the system detects that a vehicle is in your blindspot, it will alert you. This is done visually, usually by way of a warning light on your side-mirror. Some models will vibrate the steering wheel or give an audible warning if you begin to turn into a new lane while a vehicle is in your blindspot.
Why is Blind Spot Assist so important?
Well, it’s all about safety.
Accidents that occur when changing lanes are common.
Blind Spot Assist helps reduce the risk of accidents by alerting drivers to potential hazards they may not have noticed.
It’s important to note that Blind Spot Assist doesn’t replace the need to use your mirrors and to turn your head to check your blind spots before changing lanes.
Consider it an extra layer of safety, not as a substitute for good driving habits.
And that’s a wrap on fixing the ‘Blind Spot Assist Inoperative’ message in your Mercedes.
We’ve covered the common causes, how to troubleshoot them, and even dived into what Blind Spot Assist is.
Remember, while it’s great to know how to fix these issues yourself, there’s no shame in seeking professional help, especially regarding the more complex problems.
Did we miss something? Comment below if you have any questions or comments!