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 

• Refer to MOUNTING THE OUTSIDE REARVIEW MIRROR ONTO THE FRONT DOOR .
• Refer to INSTALLING FRONT DOOR TRIM PANEL .
• Refer to MOUNTING MIRROR TRIANGLE COVER .