Question about 1990 Buick Century

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1990 buick centruty, driver door schematic (window regulator)

The driver door window is inoperative, the electric motor seems to run but will not raise the window fully, possibly the window regulator is broken. I need to find instructions on how to access, remove and replace
Thank you, Paul

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  • Alex409 Aug 26, 2008

    Thank you for the advice, I found that someone else had removed

    the panel and broken some of the fasteners, all I had to do (after removing all visible screws),

    was release a tension clip on the bottom left of the panel and lift the panel straight up. But don't have a clue as to what the original clips looked like, or how to release whatever they were.

  • blkbuttafli2 Oct 12, 2008

    I have an 4dr 1990 Buick Century 6 engine and believe it or not, I have been driving around for 2 years with the drivers side window unable to power up or down! In fact, I am only able to power the windows down when the door is opened slightly! My problem began when I had the driver side window replaced after my car was broken into. Is there anything I can do?

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The first thing you need to do before buying any parts is to remove the door panel and find out exactly what is wrong, the motor is a gear reduction unit and even if the motor works it may still not drive the output gear. The door panel is held on by screws and hidden clips, pop off any panels or light fixtures on the door trim, under those you will find the hidden retainer screws, then gently pull door panel at edges to disengage feather style snaps.

Posted on Aug 26, 2008

  • yadayada
    yadayada Aug 26, 2008

    Go to a GM/Buick dealer, the clips are very cheap, also many auto parts stores have the plastic retainers in the Help! spare parts section, Auto Zone and Kragen come to mind. Also lube the window run channels with spray silicone after you are done and lube all the moving parts of the window regulator with white grease such as Lubriplate brand. If you have any other questions please call me at 925-577-7157

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I need to now how to fix the in side of mine 1990 buick century
car door (the driver side)

Posted on Jan 26, 2010

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Need to know how to fix the windows in the stereo in my 1996 Lincoln Continental.all the fuses are fine, I don't know what to do next


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from Ehow.com. Long answer
All Buick automobiles now have powered windows for both front and back doors. These powered windows use a motor attached to a continuous screw that lifts and lowers a lattice device for opening and closing the window. Each window also has a window regulator to tell the motor when to stop both lowering the window and raising it into place. Occasionally, this regulator will become faulty and need to be replaced. Although not a difficult procedure, it does mean having to disassemble the Buick's door.
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    Door Armrest
  1. The first thing to do is remove the Buick's armrest on the door. Underneath the armrest, hidden from view, are large screws that go all the way into the doorframe. Remove all of these screws and the armrest will come free. Once it's loose, carefully disconnect all the wires to the remote control switches. The driver door armrest will have more wires than the other doors. Door Panel
  2. Once you've removed the armrest, you can take off the inside door panel. Start by going all the way around the door's edges and removing all the fasteners. Once you've removed these may find some clips holding the panel tight, depending on your model Buick. Carefully unfasten these and then work the door panel up off its guide at the top of the door next to the window opening and around the car door handle. If your Buick has a door-mounted nightlight, disconnect the wires to the accessory. This will give you access to the door's interior. Removing the Old Regulator
  3. Inside the door there are two components with electrical wires: the motor and the regulator. The motor is attached to a long threaded bolt. Remove the wires connected to the regulator and then the screws mounting the regulator to the doorframe. Be careful not to scratch the window with the screwdriver when working in these close quarters. Once the regulator is free inside the door, lift it out of the door. Installing the New Regulator
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Read more: Best Way - Buick Window Regulator Installation Instructions | eHow.com http://www.ehow.com/way_6510604_buick-window-regulator-installation-instructions.html#ixzz0uQJxAMM2

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Principles of Operation
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The driver power window regulator motor is a reversible motor that is operated by applying power and ground to the motor leads to lower the window, and then reversing polarity on those leads to raise the window.
The passenger power window regulator motor is controlled directly by the passenger power window switch and can also be controlled by the master window/door lock/unlock switch. Power is supplied to the power window relay and the master window/door lock/unlock switch, and the passenger power window switch when the SEC/timer module grounds the coil side of the power window relay. The SEC/timer module will ground this relay when the ignition is in the ON position and will remain energized for approximately 15 minutes or until the driver or passenger door is opened.
The passenger power window regulator motor is a reversible motor, which is operated by applying power and ground to the motor leads to lower the window, and then reversing polarity on those leads to raise the window.
The power rear quarter glass is also directly controlled by the master window/door lock/unlock switch. The power rear quarter glass power latches also utilize reversible motors. The power rear quarter glass power latches are operated by applying power and ground to the motor leads to open the window, and then reversing polarity on those same leads to close the window.
Symptom Chart Condition Possible Sources Action
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