51 37 000 Removing and installing complete electrical window regulator from rear left and right sides
WARNING: This page is about a different car, the 2003 BMW 525i, 2002 BMW 525i, and 2001 BMW 525i. However, it is still accessible from the selected car via links, so may be relevant.
Remove rear door window, refer to 51 34 171 REPLACING REAR LEFT OR RIGHT DOOR WINDOW
Untighten screws, unfasten connector and remove window regulator (1).