Replacement only
WARNING: This page is about a different car, the 2011 BMW 750xi, 2011 BMW 750Lxi, 2010 BMW 750xi, and 2010 BMW 750Lxi. 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.