52 25 002 Removing And Installing Padding For Left Or Right Rear Seat
WARNING: This page is about a different car, the 2008 BMW Alpina and 2007 BMW Alpina. However, it is still accessible from the selected car via links, so may be relevant.
Unclip seat (1) on left and right by lifting out of catch.
Feed out belt buckle (2), remove seat (1).
Disconnect all plug connections (seat heating, air conditioning, ...).
Release screws (3) on left and right, remove seat center section (4).
Feed out belt buckle.