I have determined I have a bad PA control unit in my 2013 C2S. I have purchased a new module P/N 991.618.185.06. I have rear sensors only in my car, and this module has been confirmed to be the correct replacement unit. My question: After replacement, do I need to program this unit via PIWIS or can I replace without any further programming? Part description lead me to believe it was preprogrammed for rear assist cars only, but now I'm not sure. Thanks!