what year is the car?
the only way that the lights not flashing on the dash is linked to the roof is if the issue is a faulty ignition switch
if not a faulty ignition switch, then there is very little chance these issues are connected.
the EML light comes on when there is a problem with the engines electronic throttle control system. Whoever told you the roof, or the lights, could trigger an EML light simply does not know what they are talking about.
I would not buy this car until the issue is fixed. It could be just an ignition switch, but it could be MUCH worse if there is a roof issue. Roof issues are NOT fixable at home. You will be paying BMW workshop labor prices for any roof repair.
this car sounds very sketchy and I would stay away unless everything is fixed and you have can the car inspected by a qualified third party mechanic prior to purchase
Sorry if you were hoping for a different answer, please don't shoot the messenger - I can only give the honest answer, which I have. Please remember that a low rating PUNISHES me for my honest and prompt response, and I receive nothing for my time and answer until a positive rating is clicked.Please let me know if you have further questions. Please do not forget to click a positive rating as this is the only way I receive credit for my answer, thank you. Best wishes with your vehicle.