How do I program the power windows if the vehicle battery has been disconnected or discharged?

Close all doors and turn the ignition on or to ACC/ACCESSORY. Partially open the window to be programmed, then close it and continue to pull the switch briefly after the window has fully closed. Then open the window and continue to press the switch briefly after it has fully opened — repeat this process for each express-close window that needs programming. (Page 33)

From the official Chevrolet Trailblazer manual, page 33

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