52 14 ... Replacing Left Flex Shaft For Longitudinal Seat Adjustment Drive
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2008 BMW 750i, 2008 BMW 750Li, 2007 BMW 750i, 2007 BMW 750Li, and 2006 BMW 750i. 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).