67 11 530 Removing and installing/replacing actuator drive for rear left or right central locking
WARNING: This page does not describe the selected car, but rather 21 other vehicles, including the 2017 BMW 550i GT xDrive, 2017 BMW 535i GT xDrive, 2017 BMW 535i GT, 2016 BMW 550i GT xDrive, and 2016 BMW 535i GT xDrive. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Actuator drive of central locking drive can only be replaced in conjunction with door lock.
This operation is described in:
Removing and installing/replacing REAR DOOR LOCK