Our 2001 Cadillac DHS has an intermittent problem. The window controls (on the drivers door) will operate the four windows and sometimes not. If I attempt to operate the drivers window, and it doesn't work, then none of the other windows will operate either. If the drivers window operates, the other three windows will operate. When the windows will not operate from the drivers door switches, they DO still work from the switches on the other doors. I'm guessing it's most likely the main window control module in the driver's side door but I just want to make sure before I spend the money on a new part. Especially since I'm also having some quirky issues with the cruise control that may or may not be related. Any suggestions or advice would be greatly appreciated. Thanks!