6-37 Rear Tail/Stop/Turn Signal and Side-Marker Lamps A. Tail and Stop Lamps B. Turn Signal Lamp C. Side-Marker Lamp To replace the tail, stop, turn signal or side-marker lamps use the following procedure: 1. Open the trunk using the trunk button on the remote keyless entry transmitter or the trunk release button located on the lower part of the driver's door. 2. Remove the compact spare tire cover by turning the wing nut counterclockwise. 3. Remove the four convenience net wing nuts. 4. Pull the carpet back away from the body of the vehicle on the side with the burned out bulb. 5. Remove the two mounting screws from the lamp assembly. 6. Pull out the lamp assembly to expose the bulb sockets. 7. Turn the bulb socket one-quarter turn counterclockwise and pull the bulb and socket out of the lamp reflector. 8. Pull the old bulb from the bulb socket keeping the bulb straight as you pull it out. 9. Install a new bulb. 10. Reverse the steps to reinstall the lamp assembly.
do this. ref to: https://www.mygmlink.com/pdf/go2content/manual/US/en/Cadillac/2003cts.pdf
go to section 6-37. Its not to bad. my husband did our 2003 replacement today.
To replace your brake light, you need to unscrew the brake cover from the inside of the trunk. Then you will be able to pull the old bulb out and replace it.
You have a problem with the brake system. Once you repair the problem the light will reset itself.
From inside the trunk.
y
http://www.cadillacfaq.com/faq/answers/changetaillight/index.html here you go.
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