2017 Toyota Tacoma - Blind spot monitoring offline

My dash is displaying “BSM not available” I checked them to make sure all connections are good, any suggestions other then a dealership ?

If the sensors are clean and are not covered with mud, snow, or salt residue, then I think you likely have no alternative to a dealer visit.

Did you check the setup menu to see what the status is? With car in park, check the status. If you aren’t sure how, the owners manual should tell you.