thank you for your quick reply, it had a day to work with all these,

and when i first installed my MKIII, it works great without any problem the first go.

... i just went back to my car unpluged nav, and even the Tv module is not working porperly

- Normally with only the TV module (connected to the orinigal blue 18 pin plug), when doors are opened, date and time will displayed at the bottom of the screen (instead of the splash screen).

- now nothing displays, it just won't show a thing.

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then i tried with the the nav, same sympton as i previously described in OP...

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so i just wonder if it's the IBUS that sends info to the TV / Nav unit to let them know when to turn off / start?