The Belt Tensioner on Liing's base both tightens the belt and holds the belt at a fixed length. If the vehicle belt is tightened too much prior to trying to close the Belt Tensioner, the panel may not be able to be closed.
Try allowing a small amount of slack back into the belt, then try to close the Belt Tensioner panel once again.
If the Belt Tensioner is still not able to be closed, try a different seating location or install the Liing base using rigid LATCH (UAS).
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