Hyundai Sonata mirror sensors not functioning, no alert when vehicles pass on Hyundai Sonata

Some Hyundai Sonata owners report experiencing issues with the mirror sensors not functioning properly, leading to a lack of alerts when vehicles pass by. This problem may stem from malfunctions in the Blind Spot Detection System (BSD), which is designed to enhance awareness of surrounding traffic through features like flashing mirror indicators and audible warnings. Owners have noted that if the light sensor on the side mirror does not illuminate when cars enter the blind spot, it could indicate a fault in the BSD system. Additionally, some owners find that the BSD button must be illuminated to activate the system, and failure to do so can result in non-functioning alerts. Hyundai has issued a service bulletin highlighting that shorts in the wiring could be a common cause of these issues. Furthermore, the placement of sensors, which are typically located in the upper rear panel, can be affected by obstructions, such as chrome pieces, impacting system performance. In some cases, replacing the sensor may be necessary, which could involve removing the bumper or accessing panels in the trunk. It is advisable for owners facing these challenges to check the BSD button's status, evaluate sensor placement, and consult a professional for diagnosis and resolution.