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Here's how automatic power windows work on a car.

The power windows are controlled by a regulator and an electric motor. Window operation depends on the motor's control circuit and the window's position.

In this video, a window regulator from an Infiniti G35 is torn down. The limit switch is comprised of a planetary gear system and tells the window switch CPU when the window has reached its top most position. The encoder tells the CPU the window's speed for jam protection when using the auto-up function. The motor itself is a 12V DC electric motor, which rides on sleeve bearings and has a spiral gear.

You can purchase window regulator replacements for your vehicle here:
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Angle grinder used to cut open the door:
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My brother's toothbrush:
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Flat blade screwdriver:
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Metric socket set:
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This is the Camera I use:
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