I'm a new owner but despite reading the manual and watching the video I could not get ACC to work today. I tried many times over a long drive and it never worked. Here's my understanding of the procedure. I get behind a vehicle who I want to follow; I then press "Main" and the ACC button; at this point I see the Set Vehicle Interval lines. However, the car does not shift into any kind of cruise control ie: it just starts to lose speed. I tried doing this procedure with my foot on and off the accelerator (neither one worked). At this point I held the Set Interval button for a second and converted to regular cruise control which seemed to work. Any advice appreciated.