Windows: Description and Operation

A DC motor raises or lowers the window at each door; whether the motor raises or lowers the window is determined by the polarity of the voltage applied to it. A switch located at each door panel controls the voltage applied to that door's motor. In addition, the driver's Master Power Window switch has three additional switches, providing control for all four windows. This Master Power Window Switch also has a provision for the automatic lowering of the driver's window. This will occur when the driver's window switch is depressed fully.

Master Window Control
When the ignition switch is in ON, battery voltage from the P/WIND fuse is applied to the Master Power Window Switch. Both leads of each motor are normally grounded. To raise or lower a window, one lead is connected to battery voltage by toggling the appropriate switch. Battery voltage from the Master Power Window Switch is applied to the motors in the other three doors after passing through the individual switches located at each door.

The individual switches located at each of the three other doors control their window motors in the same manner as the Master Power Window Switch.

To provide automatic lowering of the driver's window, an electronic circuit and bi-polar relay are employed. For these vehicles, the driver's window switch is unique in that it has a fourth position to provide the automatic lowering feature. This position signals the electronic circuit to hold the relay ON in the down direction.