Owners/service Manual problems of the 2013 Chrysler 300

The forward collision warning (fcw) does not work. Info I have received is that fcw was part of the adaptive cruise control (acc) and only works as part of that system. The Chrysler manual does not say that the acc has to be on for fcw to work. Fcw is a completely different topic from acc in the manual. Fcw is supposed to work when you come up behind a car even without the acc on. In my car the fcw activates at times when the acc is off and it picks up something on the right such as a car in front of me turning right onto another road. Other manufactures such as Ford and Hyundai have fcw that works without the acc on. While not relieving the driver from needing to brake, fcw is a safety feature I paid for, and I want it to work. I have made several trips to two different dealers to try to get the fcw fixed with no success .