Removing The Tonneau Cover - Chevrolet 2003 Avalanche Owner's Manual

Your vehicle may be equipped with a tonneau cover.
The main components of the tonneau cover are
the following:
A. Front Rail
B. Bows
C. Side Rails
D. Rear Rail
E. Plastic Lip
F. Loop
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Removing the Tonneau Cover

1. Starting at the rear corner of the driver's side of the
vehicle, pull the loop (F) of the cover toward you
and then pull up so the plastic lip (E) releases from
the channel in the rear rail (D) and the side
rail (C).