Relations for the cycle route 17 are not up to date and do not correspond to the road signs. The 17 is going South of Bonnet and not east. This trace seems more accurate (only for for this little part between bonnet and Lomborgvej, there are some parts wrong elsewhere): https://www.alltrails.com/explore/map/map-f4666b1--7? 
I can't find an official trace...