Where does the power go in a car window?
In older vehicles, ALL the power and grounds for each window go through the master switch. On newer cars where the windows are controlled by the body control module (BCM), the master and door switches send DIGITAL commands to the BCM and the BCM switches power to the motors.
What causes a car window to not go down?
If your windows won’t go down, start by checking the master switch and window motor wiring. However, it can sometimes be caused by a broken sash clip or binding in the window track that’s causing a mechanical issue rather than an electrical problem.
What kind of voltage does a window switch use?
The window switch supplies battery voltage on one wire and ground on the other. When you reverse window direction, the polarity on the wires switches. To test the switch operation set your digital voltmeter to 20 volts or less DC.
How to fix loss of auto up / down on your power windows electric?
BMW Window reset Anti-Trap function. How to fix loss of auto up/ down on your power windows electric – YouTube If playback doesn’t begin shortly, try restarting your device. Videos you watch may be added to the TV’s watch history and influence TV recommendations. To avoid this, cancel and sign in to YouTube on your computer.
Why does the passenger side window not work?
The red / light blue is a different story. That is the 12-volt feed only for when the passenger switch is pressed. It is not used when the driver’s switch is pressed. This is why I suspect you have two problems, since the window doesn’t work from either switch.
How many volts does the passenger side window have?
So, the white / yellow and the tan / light blue will have 0 volts with both switches released, as you found. The red / light blue is a different story. That is the 12-volt feed only for when the passenger switch is pressed. It is not used when the driver’s switch is pressed.
Why does my window only work in one direction?
When a window doesn’t work in only one direction and only from one switch, the culprit can be either switch, the driver’s or that passenger’s switch. That’s hard to understand at first, but there’s actually four sets of contacts in each switch, and two are in play in both switches, regardless which one is pressed.
Why is the power window on my car not working?
Another common cause of an inoperative power window is a bad or failing window switch. Over time, these switches, just like the rest of the switches found on your vehicle, can get worn out due to frequent use. These switches can be damaged by rainwater corroding the internal switch contacts.