I have a 2001 GMC Yukon XL. I've had a problem with the passenger rear window since we purchased the vehicle nearly 4 years ago. Using the driver's window controls I can roll the rear passenger window down, but it will not roll up. To roll the window up, I have to reach back and use the control at the door. While this isn't a huge issue, it is a bit of a pain. Recently I had some other issues that I suspected may have been caused by the driver's controls, so I purchased replacement controls from a local guy who parts these vehicles out. I brought the controls home, and when I hooked them up, I got all of the same issues. Curious if anyone has any suggestions on what might be going on, or how to troubleshoot where the issue is.