How Does the Power Windows Anti-Pinch Safety Feature Work?

Anti-pinch Safety

Closing your power window is as easy as pressing or pulling on the window switch until your window reaches the top. It only takes a few seconds to close the window, but those few seconds take the driver’s concentration away from the road. It is becoming increasingly common for power windows to have an express-up function so the driver can press the power window button and the rest of the process is automatic.

The danger of the power window express-up feature is if there is an obstruction preventing the window from closing all the way. It can cause damage whether that obstruction is:

  • A child’s arm, head or toy
  • A chunk of ice or snow
  • A piece of dirt or a stone stuck in the window track

When the window reaches the obstruction, it can cause bodily harm or the window can shatter if the obstruction is hard. To add a safety device to the express-up feature, car makers use an anti-pinch device. The window motor has a pressure sensor that detects window motor movement when the glass has stopped moving, even minutely. If this occurs, the window reverses direction and moves downward.

The anti-pinch feature is controlled by a small module which is now often integrated into the power window switches on the driver’s door. If the vehicle loses battery power or the power windows require a repair, the power windows will not know their upper and lower limits. The window motor will need to be re-trained so it can learn the window travel limits.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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