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
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Always check ALL the fuse that supply power to the BC1. ... the heated rear windowand optional heated front screen until the voltage level exceeds 12.2 ... Convenience Opening and Closing of windows and sunroof ..... intermittent wipe, slow, and fastspeeds. .... Road speed has no influence over wiper speed 1 (Slow).
You should be able to operate window from main front switch regardless if rear switch is bad. If it does not work from rear door or front door, it is probably not the switch, but the window motor which do go quite often. Take switch and verify it is working by testing with volt meter, next, check to see if you have 12VDC at switch, could be a broken wire, another common problem with older cars.
CeraCoat-NanoTech.com
often caused by faulty thermostat which comes in a plastic case, the little lugs can break off (and often do) if thermostat cant open cooling water cant circulate
Actuator about to go out, cost about 600 dollars, have done it a least once on all windows and twice on the back ones,very common problem and happens a lot on BMWs.
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