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The power window motor changes direction based on polarity. Basically, there are two wires to it. If power enters in one wire, the motor runs one direction. If power enters on the opposite wire, the motor goes the other direction.
Now, take a look at picture 1. It shows the two wires coming from the window master switch on the driver's side. Based on which direction you turn the switch determines which wire gets power. If it isn't the driver's door window, let me know.
My first suspect is the switch is going bad. To check, you need to remove the door panel to access the switch. Then using a test light, check to see if power goes to the motor when you select up. The wires going to the driver's side window motor are white and the other is light blue. The light blue one is in question. That is the wire which receives power when you request the window to go up. So, using that test light, check to see if the switch sends power to that wire when you try to put the window up. If it doesn't, replace the switch. If there is power, check the wire to the motor and it's connections.
As mentioned in the prior response, it is getting older, but the motor doesn't care which way it turns. If it works one way, it will work the other if it gets power. Also, here are a couple links to help with the testing process:
Here is the manual's description of how it works.
Front and rear door window lift motors are of the permanent magnet type. A battery positive and negative connection to either of the two motor terminals will cause the motor to rotate in one direction. Reversing current through these same two connections will cause the motor to rotate in the opposite direction.
If you determine that the switch needs replaced, here are the directions. Pic 2 shows the door panel and fasteners. Picture 3 indicates what type of fasteners are used.
Switch removal and replacement
1. Disconnect and isolate the battery negative cable.
2. Remove the door trim panel.
3. Remove the switch mounting fasteners.
1. Install switch and mounting fasteners.
2. Install door trim panel.
3. Connect battery negative cable.
Let me know if this helps or if you have other questions.
Images (Click to enlarge)
Saturday, August 29th, 2020 AT 1:14 PM