I'm having the same issue however only my passenger side mirror blind spot light stays on even with the truck off.. I recently installed the ADD stealth fighter bumber that was falsely advertised to work with the blind spot modules. I call ADD to find a fix and they said it simply doesn't work so they stopped welding the brackets for them in their bumpers and "that not having it is a sacrifice of switching to the offroad scene" which is complete BS. Long story short I ran the truck without the sensors and got the same service message. I plugged the modules back in and am still having the same issue and I think that light that stays on is drawing a current and slowly killing the battery.