How do you manually adjust the height setting for the power liftgate?
To change the position where the liftgate stops when opening, select MAX or 3/4 mode and open the liftgate until desired height. Press any liftgate switch to stop movement and hold l on the lower part of the latch until turn signals flash and a beep sounds.
From the official Chevrolet Trailblazer manual, page 26
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