I just bought an E91 with panoramic sunroof and seller said not to mess with the sunroof at all because it's broken. So I immediately messed with it. From what I can tell, the only thing not working is the rear panel. The front panel tilts and slides no problem, and the front and rear headliners both slide and work exactly as they should. But the rear glass panel does not tilt, which is the only thing it can do anyway.

Anyone know why or how the rear wouldn't be working when the front is?