Depends on what light bulb you need to change; if is either the reverse ligh, the break light or the turn signal light (at least on my 2005) open the tail gate, and you will see on the side of the tail light housing two screws that you will need to unscrew in order to take the housing out. If is the tail light that is on the actual gate, open the tail gate and remove the plastic bed liner there are few of screw that need to be removed. I hope this helps; I replaced almost all my light bulbs with LED type bulbs.
I tried and I only see one screw, I need to change the break lights, can't get to it. Where are the to screws located?It's a 2005 sc430