Hoping someone can help. Both heated seats refuse to work. Fuse okay, three stage lights come on okay, I get a return off the heating elements. Had an auto electrician run some (expensive) tests. Z45 & Z46 open circuit/short with power intermittent came back. Also the car is saying service required although it’s been done & the counter reset comes back after a while with same notification. I don’t know if there’s some sort of thermal controller under the seats but odd both dropped off together. I understand there’s a controller hidden under the dash, maybe this needs replacing ?. Any help appreciated especially if you know how to find and remove this unit, if it is this that’s at fault. I was wondering if now it thinks a service is due it’s switched the seats off ?. It an Audi so anything is possible!