Have rear switches tested and replace if faulty, could be pinched broken wires normally damaged in harness at door hinge area concealed by rubber boot, or corrosion in plugs. Check the attached links,instruction and guides, Good luck
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GMC Acadia Forum Inoperative Rear Driver Side Power Window
Troubleshoot Power Windows
Electric Window Troubleshooting

If the master switch will open and close the windows and the rear switches open them, won't close them, replace both rear switches.