Thanks for that steve,

If you have a look in the navcoder zip there is a simple i-bus interface, I've used it to build one and it works very well, cheaper that taking it to the dealer.

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Sept 03, M3, Silver Grey. Retro-fits: Modded Mk4 DVD Drive, OEM Bluetooth, VR Control, Rainbow Speaker Upgrade, Sony SOT Amp, HK Sub, CCFL, Intravee II, NightMode.