someone else might be able to help with your problem ,I just want to give you a heads up if you unhook the radio don`t turn on igniton you will have to get it reprogrammed by dealer.
got to laugh at your colder months at 18-22c we just had -46c here about a week ago in ontario canada

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2003 bmw x5 3.0i ,219000km build date 2003-08-18