52 14 ... Replacing Left Flex Shaft For Longitudinal Seat Adjustment Drive
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.
Disconnect electrical plug connection.
Lift drive (1) and flex shaft (3) out of guide (2) in direction of arrow.
Detach flex shaft (3) (plug connection).
Loosen screws (1).
Remove drive (4).
Detach flex shaft (3) with holder (2).