On my A3 I've got 4 sensors on the front bumper, they defo look OEM, I can see the cabling behind the bumper but can't see where it goes. Thing is I've never heard them beep or dunno how I would actually use them/activate them? I've got ETKA & Elsawin and I can't even find them on that? Anyone any ideas? Does anyone else have an A3 with them fitted? How do they work/activate?