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Should be a 318i, what is the year? Have you checked relays, and depending on the year, these cars have ews modules that is a bit tricky to bypass. Unless your experienced at this on BMWs do not bypass ignition system. Hook the system back up using the factory key and try again.
if both windows went at the same time it could be your comfort relay, i think the sunroof is on a different relay, taking it that you have checked the fuses, I paid £17 for the genuine bmw comfort relay and it fixed my window problem