Blind Spot Warning Light Staying On; What Does It Say?

Blind Spot Warning Light Staying On; What Does It Say?

Why are my blind spotlights on? If the yellow Blind Spot Monitor warning light illuminates briefly, it indicates that the system is activated and operational. However, if the warning light remains continuously lit, it suggests that the system has detected an object in your blind spot, and you must exercise extra caution before performing any maneuvers like changing lanes or making a turn.

In case the warning light remains constantly illuminated, it is recommended to get in touch with your nearest authorized repairer for assistance.

In this article, you will find everything you need to know about the blind spot light with required explanations on important points. So I invite you to stick around until the end to find out what you’ve been looking for. Welcome to SolidCarCare.

Table of Contents

What is a blind spot warning system and how does it work?

A blind spot warning system is a safety feature that helps drivers detect other vehicles or objects in their blind spots, which are areas outside their peripheral vision that cannot be seen using only the side and rearview mirrors. 

The system typically uses sensors, cameras, or radars mounted on the vehicle to monitor the blind spots, and when it detects an object, it alerts the driver through a visual, audible, or tactile warning, such as a flashing light or a vibration in the steering wheel or seat. 

This technology is designed to enhance driver awareness and reduce the risk of accidents caused by blind spot collisions, particularly when changing lanes or merging onto a highway.

What are the disadvantages of blind spot warnings?

Blind spot warning (BSW) systems are designed to alert drivers when there are vehicles or objects in their blind spots, which can help to prevent accidents. However, like any technology, there are some disadvantages to BSW that drivers should be aware of. Some of these disadvantages include:

False alarms: BSW systems can sometimes give false alarms, alerting drivers when there is no actual danger. This can be frustrating and distracting for drivers.

Overreliance on technology: Drivers may become over-reliant on BSW systems and may not be as vigilant when checking their blind spots manually. This can lead to complacency and potentially dangerous situations.

Limited coverage: BSW systems typically have a limited coverage area, and may not detect vehicles or objects in blind spots that are outside of their range.

Cost: BSW systems can add to the cost of a vehicle, and may not be available on all models or trim levels.

Malfunctions: Like any electronic system, BSW systems can malfunction or fail, which can lead to a false sense of security for drivers.

Weather and lighting conditions: BSW systems may be less effective in poor weather conditions or in low light situations, which can limit their usefulness.

It’s important for drivers to remember that blind spot warning systems are just one tool in their arsenal for staying safe on the road, and that they should always rely on their own observations and judgment when changing lanes or maneuvering in traffic.

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Blind spot warning light staying on; What causes this and what are the fixes?

Blind Spot Warning Light Staying On

If the blind spot warning (BSW) light on your vehicle stays on, it can indicate a problem with the system that requires attention. There are a few possible causes of a BSW light staying on, including:

  • Sensor blockage

The BSW system relies on sensors located on the exterior of the vehicle to detect other vehicles in the blind spot. If these sensors become blocked by dirt, snow, or other debris, they may not function properly, causing the light to stay on.

What is a blind spot sensor blocked? This can prevent the system from functioning properly and may result in false alerts or a warning light staying on. It’s important to keep the sensors clean and free of obstructions to ensure that the blind spot monitoring system operates correctly.

  • Electrical issue

If there is an electrical problem with the BSW system, such as a blown fuse or a faulty wiring connection, it can prevent the system from functioning properly and cause the light to stay on.

  • Malfunctioning BSW system

If the BSW system itself is malfunctioning, it may not be able to detect other vehicles in the blind spot and may keep the light on.

Fixing the problem

To fix the problem, there are a few steps you can take:

Clean the sensors: If the sensors are blocked, try cleaning them to see if this resolves the issue.

Check the electrical connections: Make sure that all electrical connections related to the BSW system are secure and not damaged.

Reset the system: Try resetting the BSW system by disconnecting the vehicle’s battery for a few minutes and then reconnecting it.

Visit a mechanic: If the above steps do not resolve the issue, it may be necessary to take the vehicle to a mechanic for further diagnosis and repair.

It’s important to note that driving with a malfunctioning BSW system can be dangerous, as it may not detect vehicles in the blind spot and could lead to a collision. If you are unable to fix the issue on your own, it’s important to seek professional help as soon as possible.

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Can we fix blind-spot monitoring to a car?

Blind Spot Warning Light Staying On

Yes, it is possible to add blind spot monitoring (BSM) to a car that does not come equipped with it from the factory.

There are a few different ways to do this, including:

  • Aftermarket BSM systems

There are a variety of aftermarket BSM systems available that can be installed on a car. These systems typically include sensors that are mounted on the exterior of the vehicle and a warning system that alerts the driver if there is a vehicle in the blind spot.

  • OEM retrofit kits

Some car manufacturers offer retrofit kits that allow you to add BSM to a car that did not come with it from the factory. These kits may include new sensors, wiring, and a control module that integrates with the car’s existing systems.

  • Professional installation

If you are not comfortable installing an aftermarket BSM system or retrofit kit yourself, you can have it installed by a professional at an automotive shop.

It’s important to note that adding BSM to a car that did not come with it from the factory may require modifications to the vehicle’s wiring, and may also void the manufacturer’s warranty. It’s important to do your research and choose a reputable installer to ensure that the system is installed correctly and does not cause any damage to your car.

How do you calibrate a blind spot sensor?

Calibrating a blind spot sensor typically requires specialized equipment and expertise, and can only be done by a qualified mechanic or dealership. The cost and time required for calibration will depend on a few factors, such as the make and model of the vehicle, the type of sensor system, and the location of the repair facility. Here are some general guidelines:


The cost of blind spot sensor calibration can range from $100 to $400 or more, depending on the factors mentioned above.


The time required for calibration can vary, but it typically takes between 1-3 hours to complete. Some repair facilities may offer same-day service, while others may require you to leave your vehicle overnight.


During the calibration process, the mechanic will typically use a diagnostic tool to reset the sensor system and ensure that it is aligned properly. They may also test the system to make sure that it is detecting objects in the blind spot accurately.

2012 Toyota Sienna Blind Spot Sensor Calibration

It’s important to have your blind spot sensors calibrated if you notice that the system is not functioning properly or if there has been damage to the sensors or related components. A misaligned or malfunctioning blind spot sensor can lead to false alerts or a failure to detect vehicles in the blind spot, which can be dangerous.

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