Window Operation specific to the E36 Convertible:

Central Window Switch: Located in the center console, the switch will raise or lower all four windows at the same time. The window lowering has the one-touch feature.
Convertible top operation: Prior to lowering the top, the top control module signals the GM to lower all four windows half way.
- If the top switch is held after the top is fully lowered, the windows will close fully.
- If the top switch is held after the top is fully closed the GM will close the windows.
With the introduction of the fully automatic convertible top, the comfort close feature of the convertible was also added.

Fig 1: Identifying Central Window Switch
Courtesy of BMW OF NORTH AMERICA, INC.