Chevrolet 2003 Avalanche Owner's Manual page 89

6.
Turn both glass lock knobs (D), located at both top
corners
of
the storage pocket, to the locked
position. You may need to push the corner of the
rear glass to allow the lock knob to engage
more easily.
Once both glass lock knobs are in the locked
position, the rear glass is securely stored.
7. Push both latch levers (A) up to the locked position.
You should hear a click when each latch lever locks
correctly.
Rear seats can be returned
to
the normal position
when the rear glass is out and stored properly
in the storage pocket.
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