What is the (BSM) Blind Spot Monitor System?

Blind Spot Monitor System

What is the (BSM) Blind Spot Monitor System on your vehicle? Whenever a vehicle is detected in a blind area of the outside rear view mirrors, or when a vehicle is detected fast coming from behind into a blind spot, the indicator for the outside rear view mirror on the detected side illuminates. When the turn signal lever is moved toward the detected side, the outside rear view mirror indication will begin to flash.

BSM Blind Spot Monitor System

The Blind Spot Monitor has 2 functions:

1. The BSM (Blind Spot Monitor) function 

Assists the driver in making a decision when changing lanes

2. The RCTA (Rear Cross Traffic Alert) function

Assists the driver when backing up

📖What Is BSM?

BSM detects cars utilizing radar or ultrasonic sensors within the rear bumpers’ left and right sides, as well as cameras in the side-view mirror housings. An infotainment system command or a control panel button on the car may switch this system on or off.

When activated, BSM operates at speeds of up to 20 mph. BSM alerts the driver when a passing vehicle approaches and maybe enters a blind zone on either side of the automobile.

An illuminated symbol or flashing light on the sideview mirror, gauge cluster, or head-up display indicates BSM. Often accompanied by an auditory warning like a buzzer tone or chime.

Some BSM systems provide haptic feedback through the steering wheel or seat. A BSM system will notify the motorist whether or not they utilize their turn signal to indicate a lane change.

Intelligent lane-keeping systems may assist with slight autonomous steering or braking to prevent lane-changing accidents. The driver has complete control and may manually overrule the feedback.

Some modern systems employ camera technology to offer a video picture of the vehicle’s side when the driver activates the turn signal to indicate lane change. This view shows the neighboring lane and any objects in the blind area.

📖Put in Mind about BMS

Typical scenarios in which BSM issues a warning include:

  • When a passing car in an adjacent lane approaches
  • When a vehicle changes lanes and enters the warning zone from the side

BSM systems will not issue a warning in certain situations:

  • When a vehicle approaches from the opposite direction
  • When a car approaches from directly behind in the same lane
  • When passing stationary objects such as stopped vehicles, guard rails, roadway barriers, and light poles

Because the device may not work well in certain situations, the driver must confirm his personal safety.

📖Blind-Spot Monitoring Tips

✔️To get the most out of blind-spot monitoring, we suggest:

✔️Remove any dust, dirt, snow, or other obstructions from the cameras and sensors. Wipe them clean.

✔️Check your car’s manual: Consult your owner’s handbook for detailed instructions. So you can drive safely.

✔️Know your system’s limits: Know your system’s limitations. Not all BSM systems work the same. Some may only work at particular speeds. It doesn’t detect pedestrians, bikes, or animals.

Use your eyes: Before going backwards, always look behind you.


When “Blind Spot Monitor System Malfunction Visit Your Dealer” or “Rear Cross Traffic Alert Malfunction Visit Your Dealer” is shown on the multi information display.


Is it possible to install a blind spot monitor?

If your vehicle does not already have one, you will need to install one in order to utilize it. If you want excellent results, professional installation is usually the best option, however many kits make it possible to install the individual components yourself.

How much does integrating blind spot monitoring cost?

Blind spot monitoring devices vary in price from $250 to $500. Systems in this price range have improved in accuracy, but they are still not as precise as factory-installed blind spot monitoring systems seen in newer cars. Finally, high-end blind spot monitoring devices might cost $500 or more.

Is it worth investing in blind spot monitors?

With almost 10% of automobile accidents involving lane changes, BSM may be a beneficial tool when used properly. The Insurance Institute for Highway Safety (IIHS) found in a 2017 study that blind-spot monitoring decreases lane-change accidents by 14%. Furthermore, it minimizes injuries from lane-change collisions by 23%.

Is an aftermarket blind spot detection device available?

Many aftermarket blind spot monitor systems are universal, which means they may be used regardless of the age, make, or model of your car. By providing you with an additional pair of eyes on the road, the system may help to lessen your stress levels. There are many of kit possibilities available, so do your homework.

Compiled and researched with ❤️by Erwin Salarda.