Front should begin to intermittently beep ( and appear on display) at approx. 24 inches from obstacle and become a steady beep at 14 inches or less. These details are in the owners manual also detailing the rear distances that set the alarms which are different than the front/side sensors. Demosan

 

I didn't even know we had a choice! I'll look that up when I have a moment.

 

In my response to the OP I did not mean to convey these sensors are in "settings" , rather convey the rears are different than the front. In the front, as I'm you are aware, within the range of the sensors the duration of the audible signals change as you get to the 14 inch location where the "alert' is a constant sound. Hope this clarifies...……… Demosan