52 13 390 Removing and installing or replacing front left or right head restraint (normal/semi-electric)
WARNING: This page is about a different car, the 2010 BMW 550i, 2009 BMW 550i, and 2008 BMW 550i. However, it is still accessible from the selected car via links, so may be relevant.
Operation is identical to:
Replacing FRONT LEFT OR RIGHT HEAD RESTRAINT (normal/electric)