The BSM off means there is an issue with the blind spot system. You get to know about this from the indicator light. If the light does not go off, it's time to inspect your car. The BSM off light comes on when dirt, snow, or debris is on the rear bumper close to the radar sensor. The BSM off notification will pop up if you frequently drive in a snowy area. If there is an extremely hot temperature close to the radar sensor, it will trigger the BSM off alert.