I have a 2005 A8 with RSE. I can't get it to turn on for the life of me. All the common sense things are not working. Seems there is no power going to it. Eveything is connected to a media splitter box(Blaupunkt Controller Box D3 7 620 100 201). I changed batteries in remote. I don't exactly know where the fuse is for the system. Please help!!!!

 

In case anyone needs to know... To fix issue I had to recode Towing control(J345) module to 0001002 in VCDS #69 Trailer module and it worked!!! Thanks to peter at ross-tech!!!