Replacement only
WARNING: This page does not describe the selected car, but rather 31 other vehicles, including the 2015 BMW Alpina B7L, 2015 BMW Alpina B7, 2015 BMW 750i, 2015 BMW 750Li, and 2015 BMW 740i. However, it is still accessible from the selected car via links, so may be relevant.
Release screws (1).
Detach left or right seat rail from flex-shaft.
Detach motor retaining plate with drive and flex-shaft from opposite seat rail.
Installation:
PTFE hoses are shrink-fitted onto end pieces.
Check that hoses are free from damage.