51 37 000 Removing and installing complete electrical window regulator from rear left and right sides

Remove rear door window,

refer to 51 34 171 REPLACING DOOR WINDOW GLASS, REAR LEFT OR RIGHT (PROTECTION) 

Untighten screws, unfasten connector and remove window regulator (1).

Fig 1: Removing Rear Door Window

Courtesy of BMW OF NORTH AMERICA, INC.