You have to reinstall the 15 amp fuse into the fuse tap next to the 10 amp fuse that you install into the fuse slot for the steering wheel. If you only install one fuse into will power the fog lamps, but since the other slot is empty its like you removed the fuse from the steering wheel slot all together. I assume its the internal design of the fuse taps shown in the picture which i used on my 2000 A6, w/ steering wheel radio controls.