Blind Spot Detection problems of the 2022 Toyota Sienna

While driving approximately 25 mph my dash lit up with the cross traffic sensor is unavailable and my blind spot monitor is unavailable. I got out and cleaned off my sensors on the outside of my vehicle all around the vehicle front and back and the warning has stayed on. It was not raining or snowing and I was on dry pavement at the time. My vehicle was not hit nor did I hit anything. There is no damage what so ever to the sensors or anywhere on my vehicle.

Today in the morning while driving on normal road, suddenly rear cross traffic alert and blind spot monitor became unavailable according to a message on the dash. This message persisted after restarting. In the afternoon another message gave these two company. The vehicle informed me, that the parking support brake is now unavailable as well. Funny is, that these messages are not documented in the alert history of the vehicle, although they still persist. Mileage of first occurrence was 9800. Another user in a Sienna forum reported a similar problem and said this might be related to the poor design of the rear bumper that allows ingress and accumulation of dust, dirt and mud around the rear radar sensor. The vehicle was driven the week before the incident and about 700 mi before the incident on a dirt road (county road) in michigan. This was pretty dusty and a bit muddy, but nothing a normal non-off-road vehicle couldn't stand.

We are not talking about malfunction, since it's underperforming by design. Rcta and bsm don't make any audible alert. Every other vehicle I owned had this. Here bsm is silent and rcta can't be heard, because volume can't be adjusted. This is dangerous, since relying on visual with rcta doesn't make sense, when you try to watch you back in reality through the rear windows. Please recall this Toyota safety issue because it doesn't utilize its potential and poses an unnecessary risk for everyone.

While operating the vehicle in the city of helena, montana, foreign matter entered the interior of the rear bumper. This caused the rcta and bsw systems to fail because the sensors were obstructed by mud. This failure condition happens to my 2022 Toyota Sienna every three weeks. Toyota has designed the vehicle to allow the ingress of debris to the *interior* of the rear bumper, therefore the failure of rcta and bsw is inevitable. Toyota can and should know that this failure is inevitable but has offered no repair, nor has it offered advice on how to restore operability after failure. Yes, mud can interfere with safety sensors on any vehicle, but only this 2022 Toyota Sienna intentionally allows mud to accumulate on the *interior* of the bumper resulting in this otherwise avoidable failure.