Power windows not working properly

Tiny
LARRYHABERMAN
  • MEMBER
  • 2000 BUICK LESABRE
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 246,000 MILES
I replaced the window regulator in both back doors. Because neither worked nor the front passenger window. After replacing both ones, still didn't work. I have power going into the body door module but wires coming out with power. I can roll the windows up and down, by touching the right circuit in the door module. So would the module be bad or is something else? The front passenger window will work doing the same thing.
Monday, October 5th, 2020 AT 7:02 PM

8 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,055 POSTS
Hi,

I need to have a better understanding of which wires you are jumping to make them work. I attached two pics below of the entire power window wiring schematic. Take a look through it and let me know if you can identify which wires you are crossing.

I have to be honest, if power is in to the main switch (driver's side) but doesn't come out, it sounds like that is the problem. However, I just want to confirm before I make a recommendation. I hope you understand. The two pics below are from one page, but I cut it in half to make it more readable. Note that I did overlap them so you can follow from one to the next.

Let me know.

Joe
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Monday, October 5th, 2020 AT 7:14 PM
Tiny
LARRYHABERMAN
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That's the body module both back and passenger doors have one I have power to that box but none coming out. In the other pic, that's the inside and when I touch the right circuit I can get the windows to go up and down.
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Monday, October 5th, 2020 AT 7:37 PM
Tiny
LARRYHABERMAN
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I'm guessing it's the up and down circuit I touch with my voltage test light grounded to the battery.
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Monday, October 5th, 2020 AT 7:43 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,055 POSTS
It sounds like the module is the problem. It's odd that when you provide a ground (via your test light) the windows work. I wouldn't think that three would go bad at the same time so this is a bit confusing.

Go to the switches and check to see if you have continuity through the switch when they are disconnected and you actuate them. The way you described it, you are supplying a ground via your test light. However, the grounds for each window is at a different point, so it doesn't make sense that they would all fail.

Confirm the switches are good and getting power and let me know if this all happened at one time.

Let me know.
Joe
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Monday, October 5th, 2020 AT 8:11 PM
Tiny
LARRYHABERMAN
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I'm not sure when they happened, my wife bought the car recently.
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Tuesday, October 6th, 2020 AT 6:25 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,055 POSTS
Okay, let me know what you find with the switches. Since you just got the car, there is no way of telling.

Let me know.

Joe
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Tuesday, October 6th, 2020 AT 1:51 PM
Tiny
LARRYHABERMAN
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I'm guessing it's the up and down circuits that I touch with my voltage test light while grounded to the battery.
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Wednesday, October 7th, 2020 AT 12:03 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,055 POSTS
The thing that is confusing me is the idea that you are providing a ground with your test light. When you are checking, the test light is connected to the negative terminal on the battery, correct?

It would make better sense if you had the test light providing power to the circuits and not ground.

Let me know.

Joe
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Wednesday, October 7th, 2020 AT 7:22 PM

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