Principle of Operation

Principle of Operation




To protect the customer against trapping, the side-window roller blinds can only be raised when the side window is closed. The system regards the side window as "closed" up to a maximum opening of 10 mm.

- It is always possible to lower the side window roller blinds, even when the window is open.
- It is always possible to lower the window glass, even when the side-window roller blind is up.

When the window is open and a command to raise the side-window roller blind is sent, the side-window roller blind starts up briefly and reverses.This indicates that an invalid operation has been attempted. The roller sun blind cannot be raised until the customer closes the window. It is always possible to operate the quarter roller blind, irrespective of the side window position.

Briefly pressing or holding down the control buttons for the side and rear-window roller blinds initiates an automatic movement of the roller sun blinds as far as the top or bottom stop.

The left/right slide switches on the rear switch blocks are used to select whether the roller sun blinds and the side window on the left or right hand side are to be operated.

Holding down the rear window roller blind switch activates a special function, which activates the rear-window roller blind immediately. After 750 ms, all rear-compartment roller sun blinds move in the same direction as the rear-window roller blind.

For example, when the rear-window roller blind is down, both the rear-window roller blind and the rear-compartment roller sun blinds move upwards when the button is held down.

Undervoltage Protection

The voltage supply is monitored locally in the door modules. Roller sun blind operation is stopped if the voltage is less than 9.0 V.The functions are not available again until the voltage exceeds 9.5 V.

Once a roller sun blind has been set in motion, the operation is completed regardless of the voltage level.

Blockage Detection

To protect the motor and the control units, the door module has blockage detection which switches the motor off after it reaches the upper or lower end position. The deactivation criteria is calculated from the motor starting current. When 75% over the normal motor starting current is reached the control unit switches off the motor.

Motor activation is also time monitored. The system stops activating the motors after 11s for the rear and side-window roller blinds and 6s for the quarter window roller sun blind.

Timed Arrest

To prevent playing children from overloading the motor by constantly sending commands (thermal cutout), a timed arrest feature used. If this counter exceeds a maximum running time of 90s,then no new operating requests will be accepted. If running time of the motor exceeds 90s,the motor operation pauses 270s.

When timed arrest is active, it is possible to reverse the roller sun blind once downward

Child Safety Lock

The child safety lock function is engaged or released via a button in the driver's door switch block. When the child safety lock is engaged, it not possible to operate the rear compartment roller sun blinds and the rear-window roller blind from the rear switches.

An active roller sun blind function is not interrupted by engaging the child safety lock.