We have set the FCW for the normal setting and it appears on the instrument panel when we do this. Once we start to drive, the FCW has never alerted us that we need to brake and it doesn't seem like it's on. I've looked in the manual and searched YouTube without any luck. What steps do we take to turn this on so it can work properly? The rear sensors are working just fine. This can easily be something we are doing wrong. Any advice would be appreciated.