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== Operation == |
== Operation == |
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P windows are usually inoperable when the car is not running. This is primarily a security feature. It would be a simple thing to allow electric power windows to be operable when the ignition is turned off, however it would also make the car much easier to steal. Some systems offer the compromise of leaving power applied to the windows until a passenger door is opened at which time the window power is removed. |
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[[Hydraulic drive system]]s could lower the windows at rest, since pressure from the hydraulic system was merely released to lower the window. Raising the windows required an electrically operated [[hydraulic motor|pump]] to operate and introduce pressure at the appropriate [[Hydraulic cylinder|cylinder]]. These systems also required pressure lines to each cylinder (in the doors, as well as on certain cars, to the [[power seat]] and a power operated [[convertible (car)|convertible]] top). Because of the complexity, the system could also leak fluid. |
[[Hydraulic drive system]]s could lower the windows at rest, since pressure from the hydraulic system was merely released to lower the window. Raising the windows required an electrically operated [[hydraulic motor|pump]] to operate and introduce pressure at the appropriate [[Hydraulic cylinder|cylinder]]. These systems also required pressure lines to each cylinder (in the doors, as well as on certain cars, to the [[power seat]] and a power operated [[convertible (car)|convertible]] top). Because of the complexity, the system could also leak fluid. |