Install the window channel strip on the front door on the outside

• Check the window channel strip (1) for damage, replace if necessary.
• Coat the window channel strip (1) with a suitable lubricant prior to installation.
• Position the window channel strip (1) in front at the door.
• Press down the window channel strip (1) across its entire length.

Courtesy of BMW OF NORTH AMERICA, INC.

Follow-up work 

• Mount the front door outside REARVIEW MIRROR .
• Install front door TRIM PANEL .
• Mount door handle TRIM .
• Mount mirror triangle COVER .