After following the door panel removal guide, including the extra steps for the rear door panel, the plug for the rear window switch will look like this.

Gently remove the switch from the door panel and plug it back in this plug.

Note that the switch helps complete the power window electrical circuit in such a way that with the switch unplugged the regulator motor will not get power even from the switch in the front center console. It needs to be installed to move the window up and down.