Convertible Roof Module (CRM) (2006-2013): Function: Short-Drop

To prevent interference between roof sections and windows, all side windows are lowered 80 mm from their uppermost positions (completely closed) when operating the roof. This function is known as short-drop.

The function is also used when opening and closing the doors. The windows are lowered or raised by 4 mm so that they are inside the rubber trim when the doors are closed

The Passenger door module (PDM), Driver door module (DDM), Left rear door module (LDM) and Right rear door module (RDM) receive a message from the Convertible Roof Module (CRM) via the CAN network to start a short-drop at roof operation.

If the window is already in a lower position than the short-drop position, this function is ignored. During the time that short-drop is active, all other window operations are disengaged.