61 35 252 Removing and installing control unit for right electric-motor-driven retractor
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.
Operation is described in:
Removing CONTROL UNIT FOR LEFT ELECTRIC-MOTOR-DRIVEN RETRACTOR .