[Dmitry at Pelican Parts]

Hello and welcome to the forum Mark! I've attached a link to our site's DIY tech article that I think will help you troubleshoot your lock issue. If you have any more questions or need further details, please feel free to post a Comment just below the article, and someone will get back to you with specifics. Hope this helps and best of luck!

BMW E90 Door Latch Replacement | E91, E92, E93 | Pelican Parts DIY Maintenance Article