Chevrolet 2008 Corvette Owner's Manual page 128

5. Lift upward on the front edge (A) of the convertible
top off of the windshield frame. Then lift upward on
the rear edge (B) of the convertible top so it is
vertical to the tonneau cover (C). The front edge (A)
and rear edge (B) should be straight up.
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6. Tilt the driver seatback forward and press the
tonneau cover release button located on the
underside of the tonneau cover (C) behind the
driver seat. Then raise the tonneau cover (C).
If the tonneau cover does not release and three
chimes are heard, check to make sure the trunk lid
is closed. Also, the cover will not release if the
vehicle alarm is armed.
After pressing the release button, the driver and
passenger door glass should retract to the full-down
position.
If the vehicle has lost battery power, the tonneau
cover (C) can still be opened using the manual
release cable.