Operation is described in:
WARNING: This page is about a different car, the 2002 BMW M Roadster, 2002 BMW M Coupe, 2001 BMW M Roadster, and 2001 BMW M Coupe. However, it is still accessible from the selected car via links, so may be relevant.
Remove and install rear window, refer to 51 31 200 Removing and installing/replacing rear window .
Remove all glass splinters, also from underneath seats.
Check seat belts:
- condition of seatbelt strap,
- function of retractor mechanism,
- locking reel and
- seatbelt buckle.