Removing left spray nozzle:

Remove cover cap (1) in direction of arrow.

Fig 1: Removing Cover Cap

Courtesy of BMW OF NORTH AMERICA, INC.

Installation: 

Make sure locks (1) are correctly engaged.

Fig 2: Engaging Locks

Courtesy of BMW OF NORTH AMERICA, INC.

Unlock plug (2) and detach.

Fig 3: Detaching Distributor

Courtesy of BMW OF NORTH AMERICA, INC.

Release distributor (4) and detach from holder (3) towards top.

Detach washer fluid line (1) by turning.

Move wipers into fold-back position:

• Turn terminal "R" on and then immediately off again.
• Press wiper lever upwards and keep pressed for approx. 3 seconds until wiper arms stop in roughly vertical position (fold-back position).
• Fold wiper arm away from windshield.

The multifunction element acts as both the holder of the washer fluid line and cover for the wiper arm.

Unlock high-pressure nozzle (1) and remove in direction of arrow.

Fig 4: Removing High-Pressure Nozzle

Courtesy of BMW OF NORTH AMERICA, INC.

Installation: 

Make sure high-pressure nozzle (1) is correctly locked in wiper arm.

Release locks of multifunction element (2).

Remove multifunction element (2).

Feed out distributor through opening on wiper arm.

Installation: 

Make sure multifunction element (1) engages correctly in wiper arm (2).

Fig 5: View Of Multifunction Element

Courtesy of BMW OF NORTH AMERICA, INC.

Fold wiper arm back onto windshield.