Design

Design

Switch for opening/closing the roof




The switches for operating the roof are located on the transmission tunnel in the passenger compartment.
The switches are directly connected to the Convertible Roof Module (CRM). The Convertible Roof Module (CRM) receives signals from the switches to start roof operation after all necessary checks are made.
When operating the roof for opening/closing, the switch must be held depressed so that the roof opens/closes.

The functions of the switches:
- open the roof
- close the roof.

Switch for load assistance




The switch for load assistance is located on the right-hand side on the sill in the cargo compartment and is directly connected to the Convertible Roof Module (CRM). The switch controls a function called load assistance.

For operation, press the switch:
- once to activate movement
- once more to stop (if the limit position has not already been reached)
- a final time to reset the roof sections.
Operation is automatic and the switch must not be held depressed.

Functions of the load assistance switch:
- to raise the stored roof sections
- to lower the stored roof sections
- to stop operation of the load assistance.

Sensors and catches

Location Of Components, Sensors (Part 1):

There are three types of sensors that are directly connected to the Convertible Roof Module (CRM); Hall sensors, position sensors and the temperature sensor. The task of the hall sensors and position sensors is to inform the Convertible Roof Module (CRM) about the position of the roof. Information about the temperature sensor can be found in the "Hydraulic pump" section. There are also a number of mechanical catches that lock the roof in certain positions.
From the signals of the sensors the Convertible Roof Module (CRM) interrupts the movement of the roof when there is a risk of passing the limit position or when the roof module risks damaging parts of the vehicle.






Hall sensors




There are 14 Hall sensors installed around the roof for the roof function in the vehicle.
The task of the Hall sensors is to supply the Convertible Roof Module (CRM) with information about the position of the roof. The Hall sensors are directly connected to the Convertible Roof Module (CRM). The Hall sensor, which is a magnetic sensor, reads off if a certain part of the roof passes a sensor. This means the Convertible Roof Module (CRM) can determine the position of the roof, depending on which sensor has been passed.

Position sensors




There are two position sensors for the roof function in the vehicle. The sensors are mounted on the left-hand side in the link system. One by the link system for the roof's rear section and the other by the link system for the front roof section. The sensors read off the angle of the link system at operation. The signal is used by the Convertible Roof Module (CRM) to determine when the next phase of movement should occur.

Hydraulic cylinders
There are 11 hydraulic cylinders In the vehicle that are controlled by the hydraulic pump to move the roof sections when opening and closing. They manage different functions for the roof individually and in pairs.
For further information, see Design and Function, Power Retractable Hardtop.

Hydraulic pump




The hydraulic pump is mounted under a bracket in the cargo compartment below the ski hatch. The pump drives all hydraulic cylinders for the roof's function. There is a temperature sensor in the hydraulic pump that reads off the operating temperature of the hydraulic pump. The hydraulic pump is partially controlled depending on the temperature in the hydraulic pump (see the uppermost table below).





The roof's functionality also depends on the outside temperature (see the table below).






Hydraulic valves




The hydraulic system is equipped with 4 hydraulic valves that control the movement of the hydraulic cylinders. The valves are directly connected to the Convertible Roof Module (CRM). The hydraulic valves are integrated in the hydraulic pump unit.

Electric catch motor




The electric catch motor is a unit that locks the trunk lid in the correct position. The unit consists of a motor and a spring (a flexible metal cable) that transfers power to the various catches, which, in turn lock the trunk lid. The electric catch motor is directly connected to the Convertible Roof Module (CRM). The electric catch motor is located in the cargo compartment. The electric catch motor also has an integrated position sensor that senses the position of the motor.