ELECTRIC REAR WINDOWS - Description

Description

The electric windows for the rear doors are activated through the switches on the relevant doors and on the driver's front door.

The boot control unit controls rear window motor operation directly.

Front driver door controls are sent via the CAN network from the control unit on the door.

The electric windo motors are controlled in manual or automatic mode according to the specififcation.

Automatic operation takes place as follows:

• if the button is pressed for between 60 and 300 milliseconds, the operation is manual: the window closes/opens only when the button is pressed;
• if the button is pressed for over 300 milliseconds, the operation is instead automatic: even if the relevant button is released, the window continues to close/open as far as the end of travel or until the anti-collision safety system intervenes, if applicable;
• a subsequent press on the button during movement of the window locks it in its current position;
• if the button is pressed for less than 60 milliseconds, it is ignored (it is considered to have been knocked accidentally).

The boot control unit also controls the anti-crush safety function: it acquires information on the possible presence of an obstacle during the movement of the window during closing (raising: a resistive sensor is inserted in a casing fitted to the upper seal which is compressed if there is an obstacle preventing the window from closing properly: in these circumstances the control unit immediately interrupts the travel of the window and reverses it to the bottom end of travel position.

The correct operation of the anti-crush safety sensor is controlled by the check function. for the control unit: if there is a fault, this information is sent via the CAN to the instrument panel to light up the general failure warning light and to show the information on the display.

In addition, if a fault is detected, the control unit inhibits the automatic closing operation, only allowing steps of 500ms every time the button is pressed.

The circuit is controlled in accordance with the control logic for the boot control unit, whose supply is protected by two dedicated fuses and operated by the services relay for the junction unit under the dashboard: in this way the supply is ensured both the ignition ON and with the ignition OFF: during starting, this relay is temporarily deactivated, whilst with the ignition OFF, the Body Computer keeps the relay activated for 3 minutes, but deactivates it 30 seconds after one of the doors is opened

The control unit on the driver's door also manages the locking of the rear controls (protection), done by pressing the specific 'LOCK button: the lock status is indicated by an LED on the rear of the button coming on and the absence of illumination of the rear control buttons. With lock activated, no button controls the electric rear windows.

the windows are automatically opened or closed by a specific prolonged command (over 2 seconds) sent by the remote control button.

The remote control receiver aerial is connected directly to the Body Computer which contains the electronics for the actual receiver.