GMC Chevrolet SSR 2003 Owner's Manual page 103

Boot cover panel down, roof tonneau up
17. Push down the roof tonneau cover. Be sure the
boot cover clears the rear roof panel.
18. Latch the tonneau panel. Pull the red cable with the
release tool until the cable is pulled tight and the
roof tonneau latch engages.
19. Repeat Step 18 on the other side of the vehicle.
20. You will know the latches are engaged if the
roof tonneau cannot be raised. If the roof tonneau
can be raised, repeat Step 18 on both sides of
the vehicle until the roof tonneau cannot be raised.
21. Once the roof tonneau is closed, adjust the cables
located behind the seats. Pull the cable with the red
band until both cables are the same length.
Repeat this step on the other side of the vehicle.
22. Check the roof tonneau to make sure it is secure
before driving.
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