I have a 2004 BMW X5 3.0i with about 120,000 miles, and the sun-roof broke a few weeks ago. I use the sun-roof about once a week in the summer only, so I am surprised/shocked that it would brake so easily. What happened is that I put it on vent mode, which is when both front/rear panels pivot, lifting the rear edge. When I wanted to close it, both panels would rotate down, stop about half way, then move back to the open/tilted position. I checked to see if there was anything blocking the mechanism, but everything looked fine. I tried to close it a few more times and sure enough, the rear pane stop moving at all, and was always on the open/vent position. At that time the front panel was closing fine. So it looks like only the rear panel has a problem. I took it to the BMW dealer, what else could they say but "the sun-roof is broken, you need to replace it". No mention on what is actually broken, or if it can be repaired. Nothing else to do, but to replace the whole assembly, which costs about $4,400 including parts and labor!!! Since I don't have that kind of money to dump on a feature I can live without, I asked them to shut both panels manually and disable the mechanism, so that even if I tried to open it, the command would not work. Once the sunroof is shut, I rather leave it alone, specially if it does not leak water into the cabin (that is my hope, at least). My problem is that the dealer stated that to disable the sunroof mechanism, they also need to disable the manual shade that blocks the sun from coming in. This sunshade is working fine, and I would still like to be able to open/close the sunshade even thought the glass is fully shut down closed. My questions to the forum members are: 1) How common is sunroof problems? If I had know they were so fragile and so expensive to repair/replace ($4,400) I would not have touched it 2) Once the mechanism brakes, is it OK to close it and leave it shut, or does it have to be fixed/replaced? I don't mind losing the ability to open it, I just don't want water to leak in when it rains. 3) Is it possible to disable just the glass mechanism switch, while keeping the sunshade mechanism switch alive? I'd like to open/close the sunshade while that not seinding any signals to the glass mechanism, since the front glass seems to be fine and I could open it by mistake 4) Where is this switch that disables the sunroof mechanism? I am thinking of accessing it myself, connecting it back, and open/close the sunshade. As long as I don't fully open the sunshade, the sunroof mechanism should not be called in 5) If I find that the sunroof leaks, which could be happening at the rear panel, what can I do to stop the leak? The rear panel is broken for good, so I don't mind putting any extra rubber or sealant on it to fully shut it. I am concerned that now with the sunshade closed I may have water leaking into the car but since the sunshade is closed I may not be able to see that, until it is too late and the water damage spreads to other parts of the vehicle. 6) If water did enter the vehicle through a broken sunroof mechanism, where would it go? Would it fall straight into the passengers, or move rearwards corroding the tail lamp assembly, or the vehicle frame itself? I know these are lots of questions. I don't like taking the car to the dealer where they don't do any type of repairs. If the book tells them the sunroof is broken, the only next step is to replace it, no room for partial fixes or anything that is not "take broken part out, put new part in". Thank you very much for your time!