The switches are always powered since they can be turned ON at any time. The moonroof switches, if you have them, are controlled by the ignition switch. Although the map light switches always have power going to them, the will be turned OFF after 10 minutes by the battery saver feature. What are you trying to power? If it's a dashcam or radar detector, there are threads on those where they have tapped into the rearview mirror or power lines in the 'A' pillar.
Peter