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Why is my blind spot detection not working?

If your vehicle's blind spot detection system is not working as expected, there could be a few potential reasons. In this article, we'll explore some common issues and provide steps to help you get your blind spot detection back on track.


Common Causes of Blind Spot Detection Failure


Blind spot detection systems rely on sensors, typically radar or camera-based, to monitor the areas around your vehicle that you can't see directly. If these sensors are not functioning properly, the system may not be able to detect vehicles or objects in your blind spots. Some common causes of blind spot detection failure include:



  • Sensor Obstruction: Dirt, snow, ice, or other debris can block the sensors, preventing them from accurately detecting objects in your blind spots.

  • Sensor Misalignment: If the sensors are not properly aligned, they may not be able to cover the full extent of your blind spots.

  • System Malfunction: Like any electronic system, the blind spot detection components can experience hardware or software issues that prevent the system from working correctly.

  • Vehicle Modifications: Changes to your vehicle, such as adding aftermarket accessories or altering the suspension, can interfere with the blind spot detection system's operation.


If you're experiencing issues with your blind spot detection system, it's important to address the problem as soon as possible to ensure your safety and the safety of other drivers on the road.


Troubleshooting Steps


Here are some steps you can take to troubleshoot and resolve issues with your blind spot detection system:



  1. Check for Sensor Obstructions: Visually inspect the sensors, typically located on the side mirrors or rear bumper, for any dirt, snow, ice, or other debris that could be blocking them. Clean the sensors and ensure they are unobstructed.

  2. Verify Sensor Alignment: Consult your vehicle's owner's manual or contact the manufacturer to ensure the sensors are properly aligned. If the alignment is off, you may need to have a professional technician adjust the sensors.

  3. Perform a System Diagnostic: Many vehicles have built-in diagnostic tools that can help identify any issues with the blind spot detection system. Check your owner's manual or consult a professional to run a diagnostic test and identify any system malfunctions.

  4. Check for Vehicle Modifications: If you've made any changes to your vehicle, such as adding aftermarket accessories or altering the suspension, these modifications could be interfering with the blind spot detection system. Consult with the manufacturer or a professional to ensure your vehicle's modifications are compatible with the blind spot detection system.


If you've followed these troubleshooting steps and are still experiencing issues with your blind spot detection system, it's best to consult a professional automotive technician who can further diagnose and repair the problem.

How much does it cost to repair a blind spot sensor?


The cost of replacing a blind spot sensor can vary depending on the make and model of the vehicle. On average, you can expect to pay between $200 and $600 for parts and labour. The labour time can take anywhere from one to three hours depending on the location of the sensor and the complexity of the job.



Why did my blind spot detection turn off?


Either the program needs to be debugged or patched, or the sensor needs to be cleaned or replaced. Damage to your mirrors The side detection system is almost always built into the side mirrors. As a result, if your mirrors get knocked off, hit, or generally damaged, it can mess with your side detection.



How do you test a blind spot sensor?


You can do this by driving the vehicle in a safe area and observing the signals from the BSM. You should also ask a friend or a helper to drive another vehicle alongside your vehicle and check if the BSM detects it and alerts you.



How do I reset my Blind Spot Monitor?


Reset the BSM system. This can usually be done by disconnecting the vehicle battery for a few minutes, then reconnecting it.



How do you fix a blind spot on a car?


Move the rear view mirror until you have the best view directly behind your vehicle. You should make the adjustments with your head in its usual driving position. Lean your head across until it's against your driver's side window. Adjust the driver's side mirror until you see the side of your car.



Can blind spots be fixed?


Temporary scotomas, such as those caused by migraine, need no specific treatment as they last less than an hour. Scotomas in the peripheral field don't cause many problems in daily life. Scotomas in the central vision hamper activities but cannot be corrected with glasses, contact lenses, or surgery.



How do you clean a blind spot sensor?


Use isopropyl alcohol and a clean rag and clean all around the blind spot monitor.



How do you clean blind spot sensors?


Use isopropyl alcohol and a clean rag and clean all around the blind spot monitor. The back of the monitor must be as clean as possible so sealant will adhere to it. Let the area dry completely before attempting to seal the monitor and wiring.



How do I fix a spot on my monitor?


Dirt or Dust: Sometimes, white spots might simply be due to dirt or dust particles on the screen. Cleaning the screen gently with a microfiber cloth can resolve this. Regular cleaning can prevent these spots from reappearing and maintain the screen's clarity.



Why is my blind spot indicator not working?


Since the blind spot stopped working on its own suddenly this can indicate a fault with one of the mirror sensors or a fault with the blind spot control module/ECU failing. Either one of these will create this sudden loss of the blind spot assist when nothing was done by you to turn it off.


Kevin's Auto

Kevin Bennett

Company Owner

Kevin Bennet is the founder and owner of Kevin's Autos, a leading automotive service provider in Australia. With a deep commitment to customer satisfaction and years of industry expertise, Kevin uses his blog to answer the most common questions posed by his customers. From maintenance tips to troubleshooting advice, Kevin's articles are designed to empower drivers with the knowledge they need to keep their vehicles running smoothly and safely.