Window Operation specific to the Coupe, Convertible and Z3 Coupe:

The design of the E36 Coupe, Convertible and Z3 Coupe required changes in the window operation.

• When opening the door, the door glass is automatically lowered by approximately 10mm. When the door latch opens (switch closes), the window will drop. It remains down until the door contact switch opens when the door is closed. The window will then raise back into the door seal.
• When the door is closed, the glass is raised back into the seal.

  This allows the glass to drop out of the door seal when opening the door and provides a tighter seal when the door and glass are closed.

• The window motor contains a Hall sensor for this feature that is monitored by the GM.
  Fig 1: View Of Power Window (Glass Lowered)

  Courtesy of BMW OF NORTH AMERICA, INC.