Window regulators are usually located inside doors of cars and control the motion of electric windows. Going up and down seems simple enough but electric windows require a complex electrical system in order to function effectively with a long lifespan.
How do they work?
A window regulator has an electric motor that is made up of several spur gears and a worm gear. When combined and synchronized, this gear system makes the right level of torque to lower and raise the window. The gears are powered electrically from the car battery. When a driver or passenger presses the button, a signal is relayed to the motor in the door. The motor’s operation then works with a vertical motion to make the window go up or down.
Why do window regulators fail?
One of the most common reasons for window regulators to fail is due to unnecessary over-use. Often children, or indeed childish adults, may push the up and down buttons in quick succession. This creates confusion with the breaker signals reaching the engine often blowing a fuse in the motor or jamming the relay switch.
Window regulators in newer cars are generally a lot more reliable. This is because the newest designs of electronic motors can be made smaller and more powerful. This means that they are more durable, quieter, smoother and faster than older ‘power windows’.
Where does the power come from in window regulators?
Electric windows derive their power directly from the car battery. The voltage is routed by a fuse panel and transferred to the motor of the window regulator. There are often buttons to control the windows on every door. However, it is common, for there to be a master control on the driver side door. A master switch is able to override commands sent from any other button by have a direct circuit to the motor. When a master switch is initiated, all passenger buttons are disabled.
In the very newest car models, electrical systems are a lot more holistic. Rather than just having window regulators operating motion there will be general electrical modules (GEM) or body control modules (BCM). These circuits will control other electrical systems including A/C, radio and GPS navigation.
If you are planning on testing your power windows with a voltmeter then make sure that all electronic controllers are disconnected first. Otherwise, you may get a nasty electrocution!
How is the glass of windows protected?
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