ELECTRIC REAR WINDOWS - DESCRIPTION

High setup

DESCRIPTION

The electric windows in the rear doors are activated using the switches in the actual doors and the driver''s front door.

The luggage compartment junction unit checks the operation of the rear electric window motors directly.

The commands from the driver''s front door are transmitted via the CAN from the control unit in the door.

The electric window motors are operated either manually or automatically, depending on the trim level.

Automatic operation takes place as follows:

- if the button is pressed is between 60 and 300 milliseconds, operation is manual. the glass goes up/down only with the key pressed;

- f the key is pressed for longer than 300 milliseconds, operation is automatic: even if the button is released, the glass continues to move up/down until the end of travel position is reached or until the intervention of the anti-crush safety system (if fitted);

- pressing the button again whilst the window is moving stops it in the position it is in;

- if the button is pressed for less than 60 milliseconds, this is ignored (it is treated as an accidental knock).

The luggage compartment junction unit also manages the anti-crush safety function: it acquires information concerning the possible presence of an obstacle whilst the glass is closing (upwards movement): a resistive sensor is inserted in an outer casing fitted to the upper seal which is compressed if there is an obstacle preventing the window from closing properly: under these circumstances the control unit immediately interrupts the travel of the window and reverses it to the lower end of travel position.

The correct operation of the anti-crush sensor is controlled by the control unit check function: in the case of a failure this information is sent via the CAN to the instrument panel to show the information on the display.

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

The circuit is operated according to the luggage compartment junction unit control logic with a power supply protected by two special fuses operated by the underdashboard junction unit services relay: there is a power supply both with the TEG inserted (ON) and not inserted (OFF); during the starting stage this relay is temporarily deactivated whilst with the TEG not inserted (OFF) the Body Computer keeps the relay activated for 3 minutes but deactivates it 30 seconds after one of the doors is opened.

The driver''s front door control unit also manages the locking of the rear controls (protection) when the special LOCK button is pressed: the locking status is indicated by an LED in the back of the actual button lighting up and the rear control buttons are not lit up. The electric windows cannot be operated using any of the buttons when the lock function is activated.

The windows are automatically opened or closed through the special prolonged (more than 2 seconds) command sent by the TEG remote control button.