Thanks for the addition to this site. This post is many years old so that info most likely will not help them but it will help others in the future. You are exactly correct that the motor could still be the issue but more then likely the regulator is getting seized and the motor cannot overcome its when it is pressed on, you are removing enough of the binding that the motor can move it.
Here is a guide that will help with this if others need it in the future:
https://www.2carpros.com/articles/door-panel-removal
https://www.2carpros.com/articles/how-to-check-and-replace-a-electric-power-window-motor
Below is the process from the manual that will give the detail that is needed to complete this as well.
Please let us know if there is anything we can help you with in the future. Thanks
Images (Click to make bigger)
Sunday, July 4th, 2021 AT 7:09 AM