Question about 1999 Mercury Sable

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Passenger electric window does not work from passenger switch or driver master switch. How do you test whether the malfunction is wiring, switch or motor? How do you remove the door panel?

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Ok, i couldnt remember how to get the door panel off on your specific car, so while looking it up i came across this video from 1a auto. http://www.youtube.com/watch?v=m1CaEXsa0Xg

now as for testing the window system the quickest way i have found is, to start at the motor, sometimes its as simple as a loose ground or worn connection.

unplug the connector for the window motor, and with a multimeter you will want to check for voltage, if voltage is present, your window motor is bad. If no voltage is present, remove the switch on the passenger side, unplug the connection and perform a continuity check on the switch itself.

hope this helps

Posted on Apr 03, 2011

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Posted on Jan 02, 2017

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You see, the power is reversible to the window motors. When power goes down one wire to the motor, the other wire serves as a ground. The ground path goes back to the driver's master switch, where the ground for all the windows originate. Ground wire from master switch carries power to ground somewhere inside the cabin. Since other windows work, your ground is good. but the pass. window is, or seems to be missing a wire. Check by looking for power on both wires, but the window switch has to be opposite from the first time for the second wire to have power. Only if both show power is the wiring good, but they wont both show power at the same time-the switch has to be in right position to show power.
I hope this is clear, post back if you don't understand.

Oh yes, use the ohmmeter function of your multi-meter to check the wires' integrity. Just don't have any power on any of the wires you are checking, but check between the pass. door and the driver's master. Check both wires that go to the passenger window. That should tell you if you have a break in the wiring.

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