Hello, I don’t like the whole pre-plan and circuit diagrams that show that the solar aeration circuit is a closed circuit when ignited. There are already a few solutions to deactivate the solar aeration REALLY, but they are all not worthy of Phaeton. (Nothing against cable ties in general 😉 ) My idea is this: In the AC menu, take off the item “solar aeration” via Can Bus, send this signal via an Arduino with Canbus Shield, which then controls a bistable relay in the current circuit solar cells – fan motor. Bistable because it is supposed to keep off the ignition and thus voltage off the relay, a normal relay always needs a control current to stay switched and at rest current we already have enough in the car. Now, however, someone has to help me with the canbus. Where can I take off the comfort can? On the OBD plug obviously not? And what ID does the point “solar aeration” have to remain and on the calm current? And is the menu point even finished in the car?