I have an 85 911, so it might be different. On my car if you look at the little white in-line connector near the bottom of the photo, that was my issue. It is a connector that supplies power to the components you mentioned. I suspect it was a connector the factory put in to allow a mechanic to separate, and kill the interior lights and the trunk light during maintenance if the doors or the trunk were left open. I had to replace my connector to get everything functional.