My car got bumped in a parking lot and now the blind spot detection system seems to be offline. I am getting an error message when I turn the car on and the rear BSD isn't working. Is there a way to correct this without paying $1500 to the dealership. I already went there and they told me the only way they can fix it is to pay the $1500 so they can rebalance it. They are telling me that the blind spot detector is a plate that has to be replaced in order to line them up. Any ideas?