Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.