hi all.
finally got around it installing my navcoder softwate and interface today. I went for a usb interface from ebay (3 wires one and and the mini usb other end)

got it setup and running all ok. could see ibus traffic etc.. flowing through. however when I finished I shut down the laptop. disconnected the usb lead from the interfact and tucked the interface ontop of the nav.

when I went to go in the car and go out the whole screen/radio etc.. was dead.

it wasn't until I plugged the interface back into the pc it started working again. I tried this a few times and it seems everytime the interface is disconnected the screen/radio etc.. will stop working. if its its turned on and disconnected the radio remains on with no way to turn off. the only way I could overcome this was disconnecting the yellow (power) wire from where I spliced into and the bmw system acted normal again..

anyone experienced this or know why

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2005 E53 X5 post facelift