Description And Operation: Description
Electric windows - The front and rear windows are managed by the Body Control Module (BCM). Vehicle users can move the windows using the switches on the door panels. All windows on the vehicle (front and rear) can be moved using the switch module on the driver side door panel. The BCM moves the front windows in manual and automatic mode. The motion of the front windows is assisted by the anti-pinch function.
The window movement mechanism is connected to a carrier with screws. The carrier is located behind the door panel and is in turn screwed to the frame of the door. To remove the window movement mechanism, remove the carrier and disassemble at bench.
Both electric motors of the front electric window mechanisms incorporate an electronic unit that exchanges data with the BCM via the Local Interface Network (LIN) bus. The integrated electronic unit, in addition to providing a supply to the electric motors in "raising" and "lowering" modes, manages the anti-pinch function.
The switch in the driver side switch unit that operates the passenger side window is connected to the BCM. When the switch is operated, the BCM receives the signal and then instructs the electronic unit of the passenger side motor to move the window via LIN. The electronic unit, in its turn, provides a supply to the electric motor for the raising or lowering motion.
The electric motors of the rear window movement mechanisms do not have an electronic unit that manages the electrical command to the motor. It is controlled directly by the BCM in "raising" and "lowering" modes.
The pins are in the pin 1 down and pin 2 up position In the following ignition switch conditions:
- OFF
- ACC
- ON
- ON with Engine running
- During starting
FRONT WINDOWS
The electronic unit built into the driver side electric motor can raise and lower the window in accordance with the command that arrives from the switch located on the driver side panel switch unit. The electronic unit can activate the electric motor only if the LIN bus through which it communicates with the BCM is in normal operating conditions. If the LIN bus is no longer in normal operating conditions, but in sleep mode, the electronic unit cannot move the window.
The LIN bus enters sleep mode after three minutes with the ignition switch or Keyless Ignition Node (KIN) in the OFF position. During the three minutes from key-off, the LIN bus is active and the window can be moved (comfort enable function). If the driver or passenger door is opened in the course of the three minutes, the comfort enable function is deactivated.
The electric windows for the doors are operated through the switches on the driver side door (both windows) and the passenger side door (passenger side only).
The electronic circuit inside the controls operates the front electric window motors - both driver and passenger side - which are operated in automatic mode, according to the following logic:
- if the button is pressed for between 60 and 300 milliseconds, operation is manual: the glass goes up/down only with the button pressed;
- if the button is pressed for longer than 300 milliseconds, operation is automatic: even if the button is released, the glass continues to go up/down until the end of travel or the implementation of the anti-crush safety system if fitted;
- pressing the button again while the window is moving stops it in the position that it is in;
- if the button is pressed for less than 60 milliseconds, this is ignored (it is treated as an accidental press).
The electronic circuit inside the motors manages the anti-crush safety function: i.e. it acquires information about the possible presence of an obstacle during window closure (rising); the anti-crush function is performed by a Hall effect sensor that senses overloads on the window motor; the intervention threshold is set when the force of the obstacle encountered along the window travel (e.g. a finger, a hand) exceeds 7/8 kg (2.0 lbs).
The electronic unit automatically reverses the actuator which retracts the window by around 20 mm as required by regulations in force.
The power supply logic of the electric window controls is called "comfort enable":
- the electric window function operates only with the ignition on, with the following exception: after a key-off, the windows can be operated for 3 minutes; when this time period elapses, the system no longer acquires new commands.
- if one of the doors is opened during the timed period, new commands are no longer acquired, but any commands received before the opening of the door are brought to a conclusion.
- if one of the doors is already open at key off, any commands received before the opening of the door are brought to a conclusion.