For some time now, both cigarette lighters have not been working on my fat. (No current despite the ignition. despite running engine; Sry, I have never tried before whether they already have power with the ignition on.) They have failed simultaneously!

I checked the appropriate fuses; they are fine. (Also the other consumers who are simultaneously protected with these fuses work tadelos.) I assume that there is a relay or even ECU that switches the electricity through for the cigarette lighters.
If my assumption is correct, where is this relay or ECU?
If my assumption is not correct, what else could be the cause?
Thank you very much in advance!