(1) Remove the passenger side door sill by pulling straight up an inch (or so), first at the front, then working your way to the rear. It is held in place by blind clips. Remove it completely once all the clips (4) are free.
(2) Remove the push-type plastic retainer located near the lower front of the kick panel.
(3) Pull the kick panel straight back (toward the rear of the car) while lifting slightly at the rear to clear the first door sill retainer. There is a blind retainer clip about 1/3 of the way down from the top.
(4) Disconnect the battery (-) cable.
(5) You will have to undo several wiring connectors and move the harnesses out of your way. Then you will be able to access the computer.