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Originally Posted by Brian-bmw
That is an interesting idea. It would probably work for backup camera, but I am not sure if it would work as a video source. The reason is that this is designed to work in conjunction with a navigation module. It probably emulates a TV module to the nav computer, and then nav computer puts the "Television" option on the main menu that activates it. So, without the nav, there might not be a way to tell it to turn itself on.
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Where have you seen that this requires the navigation module?
Please note that both the navi and the tv module are able to generate the menus on the screen, but when both modules exist, the tv overrides the navi:
- with navi: navi R+G+B connect to screen R+G+B
- with TV: tv R+G+B (same pins) connect to screen
- with navi and tv: navi R+G+B aren't used, and an alternative set of pins, plus another pin called "navi sync" connect to the TV's second connector.
Thus the TV generates the menu structure, and whenever the navi has a map to show, it sends a "please let my screen signal pass through" to the tv.
Back to the ebay module, it looks like a simple composite tv (RCA, whatever) to screen resolution adaptor. It would pass the input video signal into the screen, but won't provide any menu like the original.