It's a start. I'm confused about the switching module. Can you post a few wide shots of the setup in the car and also including what is behind the pop out LCD monitor (there should be an A/V module mounted behind it). Also a few photos of the sides of the switching module so that I can see the connectors. Hopefully then once we identify everything I'll be able to locate the installation instructions for you and then ideally you can buy the missing components and have a complete working system.