2020 Prius Prime XLE here. For my blind spot monitoring system I have the red lights on my a-pillar. Yesterday all of a sudden both lights turned constantly on, and when a vehicle was in my blind spot and I turned on the turn signal there was no beep warning. Today both lights are constantly off and the blind spot monitoring system is still not alerting me when I turn on the turn signal with any audible warning and the red light doesn't come on either When I go into the vehicle settings it does not show me any setting for BSM even though the manual clearly shows that there is a BSM setting The car otherwise drives just fine. There has been no snow or heavy rain or mud that would cause the sensors to malfunction. The only thing is this is Virginia and yesterday temperature was around 85°, not sure if that has anything to do with this I have not tried to disconnect the 12 volt battery yet. And I have not checked any fuses either just yet - i don't know which fuse to check. What could be the root cause and the fix?
