There are a few reasons why your BSM (Blind Spot Monitor) light may be on. Here are the most common:
1. You have a flat tire or low tire pressure. Check your tires to see if they need to be inflated.
2. Your gas tank is running low. Fill up as soon as possible!
3. There's something obstructing your view of the blind spot monitor sensors, such as dirt, snow, or ice build-up. Clean off the sensors and make sure they're unobstructed.
4. The system could be malfunctioning. If the light is flashing, it indicates a more serious problem and you should take your car to a mechanic to have it checked out as soon as possible