There is a way to open the cover manually. I am sorry I did not get it to you sooner.
I hope this helps you. If so, please ACCEPT this answer. I will be glad to help further if needed.
To open the cover Manually:
If an electrical or battery failure
happens, your vehicle is equipped
with a manual release lever that can
open the tonneau cover.
1. To open, locate the manual
release lever under the right front
corner of the pickup box.
2. Using the ignition key, unlock the
cover and pull the lever down to
manually open the tonneau cover.
3. Push the tonneau cover up for
access to the pickup box.
4. To close, push the tonneau cover
down on the pickup box until it