Right brake light is out. How do I get to it to replace the bulb

remove both rear tail lamps and check bulbs, the upper ones are the ones for stop, if one is burnt, then replace all six bulbs so you won't have to do this job over again. the fuses are located under hood and also on outside of drivers side instrument panel

I assume the solution is the same in a CTS as a CTS-V. Remove the plastic molding facing the rear. There are four plastic screws, Unscrew and lift the spare tire cover. Unscrew plastic screws on carpet covering quarter panels pull back for room to work. Each light assembly has two nuts, remove these and assembly will slide out for easy replacement. Since both lights stopped at once, the fuse may be the issue. The fuse box is under the rear seat cushion, behind the driver. Pull the seat up and forward. Pull levers out on each side of fuse box cover and lift. The diagram is inside the fuse box cover. It'll take a 15V. Note: Please take care in replacing and seat and proper seat belt placement. While you're in the backseat, check all the fuses, there's a second fusebox on the passenger side. Also, check floor behind driver's seat for wetness and water. That could cause a short as well. Good luck!

go to the brake pedal siwtch and check voltage there, the center light is not on the same circuit

its an led assembly dealer only will sell you the whole light, unless your a wizz at soldering and testing for the right resistors this is the only fix

take it to an electric shop to trace wiring.

It is the LED componet in the taillight, not the bulbs that are replaceable. I had the same problem and only solution is to replace the entire assembly.

Raise hood and remove two hex bolts holding light assembly. You will see three round rubber covers, approximately 4" in diameter. Unscrew the one to the far left, giving access to the signal light bulb. The bulb pulls straight out. Insert new bulb, replace rubber cover, attacht light assembly back to vehicle with hex bolts, close hood, and pat yourself on the back for job well done.

Did you confirm that the old bulb was bad? Was it slightly dark and the filament broken? Is there moisture getting into the light housing?

If you are referring to the maker light on the fender you must remove the plastic wheel well liner panel section. from=nt of wheel well to access the light.

replace the bulb it is a double bulb so it will still work on tail lights but not brake lights replacing the bulb should correct this