Buick Repair Questions? Ask a Mechanic for Answers ASAP
Try opening all the way, then press the open button again until it vents, then try close it all the way.
I believe you are describing this condition, "With the sunroof in the vent open position, press the sunroof vent close switch. The sunroof should close.
and here is the troubleshooting procedure for that,
JustAnswer® is not a free service. I work hard to make sure you're satisfied with my service and I only get credit for my answers based on your rating. Once you're satisfied, please leave a positive rating.