Power window Buick

[Getter-Done]

I found a wiring diagram online.

That is the best picture I can get.



So you have both up and down wires that have 12 volts?

[kaycee]

Yes sir 12 volts all the way to motor

[RustyPile]

Originally Posted by kaycee

Yes sir 12 volts all the way to motor

The switches not only apply voltage to the motor, but they also switch the polarity on the motor.. Unplug the harness form the motor and connect a test light to the 2 wires.. Do not connect the light to a ground source.. If all the switches, relays, and wiring are intact and working, the test light will light up when the switches are moved up or down.. If the test light lights up both ways, the motor is bad.. If it light up in only one direction, it's time to dig deeper for switch failure, and/or wiring failure. If ANY of the other windows work as they should, you do NOT have relay problems.

An LED bulbed test light will not work for this test. You have to use one that has an incandescent bulb in it.

[kaycee]

Ok did that light works on the up side but not on the window down ,

[Getter-Done]

Originally Posted by Getter-Done

Wires sometimes break where they run through the door.

They may not appear to be broken because the insulation is still intact.

I think you have a Wire in the harness that is Broken.

Originally Posted by RustyPile

The switches not only apply voltage to the motor, but they also switch the polarity on the motor.. Unplug the harness form the motor and connect a test light to the 2 wires.. Do not connect the light to a ground source.. If all the switches, relays, and wiring are intact and working, the test light will light up when the switches are moved up or down.. If the test light lights up both ways, the motor is bad.. If it light up in only one direction, it's time to dig deeper for switch failure, and/or wiring failure. If ANY of the other windows work as they should, you do NOT have relay problems.

An LED bulbed test light will not work for this test. You have to use one that has an incandescent bulb in it.

Great explanation.

I neglected to add the workings of the Motor with 2 wires and that one is (Power up) and the other is (Power down).

I was working on a remodel of my Kitchen.
And sneaking in to keep up on the Forum.

Originally Posted by kaycee

Ok did that light works on the up side but not on the window down ,

That wire needs power also.
The regulator grounds thru the mounting screws.

These newer Vehicles are not as simple as our 63 Impala's

[RustyPile]

Originally Posted by Getter-Done

>>>>>snip<<<<<<<<<
Great explanation.

I neglected to add the workings of the Motor with 2 wires and that one is (Power up) and the other is (Power down).

:

Getter-done, That's only partially correct.. The motor is not grounded to anything... The motor is of the "bidirectional" design, meaning depending on the polarity of the voltage being applied it can run in either direction and the switches make that direction selectable.. The two terminals are actually each end of the windings. One is positive and the other is negative.. Apply positive voltage on one of the wires and ground the other -- the motor runs "forward".. Reverse the polarity of those two terminals and the motor runs the other direction. This reversal of polarity is all done through the switches.. It's a very complicated and complex circuitry, not meant for the unskilled or faint of heart..

@kaycee... Since you have substituted known good switches, I think you have an open circuit in the wiring.. Most probable location is inside the boot that houses the wiring as it passes from the door post into the door. If you want to learn how the circuit works, send me a private message, and I'll be glad to send you the GM Factory generated troubleshooting guide for power windows. It is a step-by-step procedure and if followed precisely, it will guide you to the problem..

[kaycee]

Well crap , I was thinking that must be how the switch operates appreciate all the help and advice. I’m still trying to figure out how to work my multi meter and pinpoint electrical problems a little better, maybe the step by step will help.Again Thanks for the Help

[kaycee]

Well crap , I was thinking that must be how the switch operates appreciate all the help and advice. I’m still trying to figure out how to work my multi meter and pinpoint electrical problems a little better, maybe the step by step will help.Again Thanks for the Help