General description

GENERAL DESCRIPTION

Operation of the left-hand power window (driver's side) is of the automatic type (*) controlled by a control unit which actuates it in accordance with the following logic:

• acting on one of the two buttons and keeping it pressed, the window is raised or lowered normally until the button is released,
• a short impulse (less than 300 ms approx) actuates the electric motor which automatically stops when the stop limit is reached (window completely open or closed);
• an even shorter impulse (less than 50 ms approx) is considered by the control unit as an accidental shock and no action will result.

All the power windows are turn-key operated. The electrical mechanism which actuates the front right-hand window is of the traditional type: when the button is pressed the window is raised or lowered; it is equipped with two control switches, one on the right-hand door and one on the left-hand door.

FUNCTIONAL DESCRIPTION

The power window control unit N38 is supplied at pin 2 of connector A by voltage from the battery via fuse G311 (25A) protecting the left-hand power window. The key operated supply reaches pin 1 of connector B via fuse G310 (25A) which also protects the right-hand power window. Consensus signals for the raising and lowering of the window reach pins 3 and 4 of connector B from the left-hand window control switch B53. This double switch sends and ground to the control unit and then to the electric motor P15 on the side where the contact was closed, determining in this way the direction of rotation of the motor. The actuation signals (raising or lowering) for the left-hand window motor P15 leave from pins 3 and 4 of connector A of N38. Pin 1 of connector A of N38 is connected to ground. The actuation of the right-hand power window is directly controlled by one of the two switches B21 (B21a located on the right-hand door, B21b on the left) connected in series. The key operated supply passes fuse G310 (25A) and the negative signal from ground G148b. The motor of the right-hand window P14 is in this way actuated by the double switch B21 in either one direction or the other depending on the origin of the positive or negative signal.

TROUBLESHOOTING TABLE

(*) If the off-side window does not have an automatic raising device see successive Section 22A