I've seen this before,

Drive the car a round for 5 minutes then come back switch off and leave till the i-bus goes to sleep (15 mins) the try.

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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.