I have been researching the wiring inside the cab of our 2015 Seneca and have have somehow stumbled upon an excellent document about how the chassis is wired. Details on SmartPlex switch and just about everything you might want to know about the electrical is in this document.
Too good not to share with the Seneca Community.
UPDATE: The file is 12mb - and the Forum will not allow an upload of that size... ADMINS... Please help