Necessary preliminary tasks

• Remove FRONT DOOR WINDOW GLASS 

Unscrew nuts (1).

Feed out rear section of power window unit (2) in direction of arrow.

Tightening torque, see 51 33 1AZ in 51 33 POWER WINDOWS, FRONT .

Fig 1: Removing Rear Section Of Power Window Unit In Direction Of Arrow

Courtesy of BMW OF NORTH AMERICA, INC.

Feed out front section of power window unit (1) with flat motor (2) in direction of arrow from front door.

Replacement: 

Remove FLAT MOTOR FOR POWER WINDOW UNIT .

Fig 2: Removing Front Section Of Power Window Unit With Flat Motor In Direction Of Arrow

Courtesy of BMW OF NORTH AMERICA, INC.